CN201664774U - Electric tool - Google Patents
Electric tool Download PDFInfo
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- CN201664774U CN201664774U CN2010200043019U CN201020004301U CN201664774U CN 201664774 U CN201664774 U CN 201664774U CN 2010200043019 U CN2010200043019 U CN 2010200043019U CN 201020004301 U CN201020004301 U CN 201020004301U CN 201664774 U CN201664774 U CN 201664774U
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- electric tool
- motor
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- output shaft
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Abstract
The utility model relates to an electric tool comprising a casing, a motor, a first transmission part, a second transmission part, a ring-shaped connector, an output shaft, an output shaft, a control circuit and a driving component, wherein the motor is arranged in the casing and provides rotating power; the first transmission part receives input torque outputted by the motor and comprises a first inner tooth ring; the second transmission part is connected with the first transmission part and comprises a second inner tooth ring; the ring-shaped connector is connected to the second inner tooth ring and can axially move between a first position generating first transmission output and a second position generating second transmission output; the output shaft is connected with the second transmission part; and when the input torque is larger than a preset value, the control circuit controls the driving component to drive the ring-shaped connector to move from the first position to the second position, so that the output shaft outputs different rotating speed. Compared with the prior art, the electric tool does not need to additionally release a reset spring before start, and operators can obtain comfort in operation and good handfeel.
Description
Technical field
The utility model relates to a kind of electric tool with automatic gear shift transmission device.
Background technology
D.C. electric drill is normally used for boring and stubborn screw.In the process of executing the task; the moment of torsion that electric drill bore can change; for protection motor under different torque condition can not transship and burn, the transmission device that is provided with controlling organization control electric drill on the electric drill at moment of torsion less than the certain predetermined value with surpass and produce different output under the situation of certain predetermined value.As having disclosed a kind of variable speed drive of electric tool among the open CN101117999A of Chinese utility model patent, can increase the output speed that changes electric tool according to moment of torsion.Move between two prepositions by annular connector is set, power tool transmission can realize fluid drive.But this system the time needs the operator can make transmission device be in the output state of high speed low torque when starting shooting with hand push switch spring in start, and it is big that the required force rate of operator presses switch is pushed the required power of regular tap, the operation comfort deficiency.
The utility model content
The utility model provides a kind of electric tool with transmission device of handled easily.
For achieving the above object, the technical solution of the utility model is a kind of electric tool, comprising: casing; Be located at the motor that rotary power is provided in the casing; Receive first driving section of the input torque of motor output, it comprises first ring gear; Second driving section that links to each other with first driving section, it comprises second ring gear; Annular connector is connected to second ring gear and can and produces axially-movable between the second place of second transmission output in the primary importance that produces first transmission output; The output shaft that links to each other with second driving section; Described electric tool also comprises control circuit and actuator, and input torque is during greater than preset value, and control circuit control actuator drives annular connector and moves to the second place from primary importance, thus the different rotary speed of output shaft output.
Preferably, described electric tool comprises the rotating switch bar of the rotation direction of controlling motor, is provided with the clutch switch boards between described clutch and the rotating switch bar and makes the clutch single effect.
Preferably, described clutch comprises the outer ring that links to each other with casing, the inner ring that links to each other with second ring gear and be located at the outer ring and inner ring between rolling element.
Described actuator comprises electromagnet apparatus and the impeller that links to each other with annular connector.Preferably, described actuator comprises electromagnet apparatus and the impeller that links to each other with annular connector.Further, described electromagnet apparatus comprise the lengthwise setting metal shell, be arranged on the coil that distributes along longitudinally in the metal shell, be arranged on permanent magnet between the coil, be arranged on by in the coil region surrounded and can be along the linearly moving iron core of longitudinally.
Preferably, described actuator comprises servo motor and pushing block, and the rotation direction control pushing block that the control circuit output signal changes servo motor moves axially, thereby annular connector is moved between the primary importance and the second place.Further, be provided with screw rod between described servo motor and the pushing block, pushing block is provided with screw thread, makes pushing block linear mobile thereby servo motor drives the screw rod rotation.
Preferably, described control circuit comprises detecting unit, is used to detect the variation of the parameter of output shaft; Comparing unit compares the changing value of the parameter of detecting unit output and predetermined numerical value; Signal generating unit receives the comparative result of comparing unit output and sends control signal according to comparative result.Further, described control circuit comprises that also arithmetic element carries out mathematical conversion to the variation of parameter, and exports the conversion result to comparing unit, and comparing unit compares conversion result and another predetermined numerical value.The parameter of described output shaft is the electric current of motor.
Compared with prior art, the utility model moves the switching of realization output speed by control circuit and actuator drive annular connector is set at diverse location, need not the release back-moving spring outside the start forehead, and the operator operates comfortable, and feel is good.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and embodiments.
Fig. 1 is the schematic diagram of first embodiment with electric tool of transmission device, and wherein, transmission device is in the low or first gear position.
Fig. 2 is the schematic diagram of electric tool shown in Figure 1, and wherein, transmission device is in high range position.
Fig. 3 is the schematic diagram of clutch and switch bar effect, and wherein, switch bar is in just changes gear.
Fig. 4 is the schematic diagram of clutch and switch bar effect, and wherein, switch bar is in the counter-rotating gear.
Fig. 5 is the schematic diagram of second embodiment with electric tool of transmission device, and wherein, transmission device is in high range position.
Fig. 6 is second embodiment with electric tool of transmission device, and wherein, transmission device is in the low or first gear position.
Fig. 7 is the schematic diagram of the control circuit in the controlling organization.
Wherein,
40 electric drills, 46 transmission devices, 52 handles
41 casings, 47 output shafts, 54 first driving sections
42 motors, 48 hammers, 56 first centre wheels
43 armature shafts, 49 instruments, 58 first planetary gears
44 power supplys, 50 switches, 60 first planet carriers
62 first ring gears, 84 clutches, 105 shifting blocks
63 annular connectors, 86 clutch outer, 106 clutch switch boards
64 second driving sections, 88 rolling elements, 108 switch bar
66 second centre wheels, 89 clutch inner rings, 109 switch shifting blocks
68 second planetary gears, 90 impellers, 110 electromagnet apparatus
70 second planet carriers, 92 gear shift steel wires, 112 iron cores
72 second ring gears, 94 servo motors, 114 permanent magnets
73 shifters, 96 screw rods, 116 coils
74 the 3rd driving sections, 97 motor switch, 118 impellers
76 the 3rd centre wheels, 98 switch triggers, 120 shift block
78 the third line star-wheels, 100 control circuits, 122 steel wire covers
80 the third line star framves, 101 motor host cavities, 124 detecting units
82 the 3rd ring gears, 102 reduction box housings, 126 comparing units
83 actuators, 104 clutch shifters, 128 signal generating units
The specific embodiment
Referring to accompanying drawing 1-4, first embodiment of the present utility model.A kind of electric drill 40, comprise casing 41, be contained in the motor 42 in the casing 41, the power supply 44 of electric energy is provided for motor 42, linking to each other with power supply 44 is used to start/stop the switch 50 of motor 42, transmission device 46, the output shaft 47 that links to each other with transmission device 46 and the hammer 48 that links to each other with output shaft 47 that is driven by motor 42 and be contained in instrument 49 in the hammer 48.Electric drill 40 also comprises handle 52, between casing 41 and power supply 44.In the present embodiment, what power supply adopted is power brick, such as, can adopt the lithium battery bag.Certainly, also can be NI-G, Ni-MH battery bag etc.
First planetary gear 58 is sheathed on the keeper, simultaneously with first ring gear 62 and 56 engagements of first centre wheel.Keeper is to be parallel to the straight pin that armature shaft 43 axis are provided with.First planetary gear 58 passes to first planet carrier 60 by keeper with the rotation of armature shaft 43, at this moment, and 54 outputs, first transmission output of first driving section.
Second planet carrier 70 comprises some keepers that a side of disk-shaped main body and autonomous agent is stretched out, and the relative opposite side of the 3rd centre wheel 76 autonomous agents stretches out, and can mesh with the third line star-wheel 78.Second planet carrier 70 and the 60 coaxial settings of first planet carrier.
The 3rd ring gear 82 is annular elements, and its inner circumferential surface has the internal tooth with 78 engagements of the third line star-wheel.Its external peripheral surface is supported in the reduction box housing 102.
The third line star frame 80 comprises some keepers that a side of disk-shaped main body and autonomous agent is stretched out, the 3rd centre wheel 76 and 78 engagements of the third line star-wheel.The third line star frame 80 meshes with output shaft 47, the rotation of the 3rd running part 74 is exported be delivered to output shaft 47.
Shifter 73 is used for automatically the variation of load being made a response the output speed of output shaft is switched.Shifter comprises switch unit and control module.Wherein switch unit comprises the impeller of being located at outside the reduction box housing 102 90, connects the gear shift steel wire 92 of impeller 90 and annular connector 63.Under the effect of control module, switch unit moves annular connector 63, makes its primary importance that is in or second place, thus the different rotary speed of transmission device 46 outputs.
Impeller 90 is located on the outer surface of reduction box housing 102.The outer circumference surface of impeller 90 is provided with accepting groove, and what be used for part accommodates gear shift steel wire 92.
Gear shift steel wire 92 is semi-circular, and circumferential body partly is contained in the accepting groove on the impeller 90, and both ends radially bend inwards, and with the draw-in groove clamping that annular connector 63 external peripheral surfaces are provided with, drives annular connector 63 and moves axially.
Switch 50 is located between reduction box housing 102 and the handle 52, comprises that motor switch 97 and operator presses trigger the switch trigger 98 of motor switch 97.
Below in conjunction with accompanying drawing 1-2, the state that the shifter 73 of the electric drill among first embodiment 40 is in diverse location is narrated and is illustrated.In the present embodiment, the actuator in the control module adopts servo motor 94.Be used as driving member with a screw rod 96, tapped impeller 90 and steel wire cover 92 simultaneously.Positive and negative transferring by servo motor 94 drives impeller 90 moving on screw rod 96, moves together thereby drive annular connector 63, realizes the switching of high low gear.Control circuit 100 is electrically connected with servo motor 94, control circuit 100 sends control signal control servo motor 94 just to be changeed or is reversing, thereby drive impeller 90 and steel wire cover 92, drive annular connector 63 and move, transmission device 46 is switched between top gear gear and low or first gear gear.Transmission device shown in Fig. 1 46 is in the top gear gear.
Clutch 84 comprises clutch outer 86 and rolling element 88 and the clutch inner ring 89 that is served as by the external peripheral surface of second ring gear 72.Clutch 84 also comprises the clutch shifter of being located between clutch outer 86 and the clutch inner ring 89 104.Clutch outer 86 comprises the shifting block 105 that inwardly stretch in radially overhanging clutch shifter 104 and footpath.Shifting block 105 is between two rolling elements 88.Rolling element 88 is positioned at the slope both sides that are provided with on clutch outer 86 inner surfaces.Referring to accompanying drawing 3-4, under the effect of motor positive and inverse switch bar 108 and clutch switch boards 106, the different rolling element in the clutch 84 limits the rotation of clutch inner ring 90 in different motor steerings.Wherein switch bar 108 shown in the accompanying drawing 3 is in positive transposition and puts, and clutch switch boards 106 is struck and rotates counterclockwise around pivot, and then drives the clutch outer 86 that is provided with clutch shifter 104 and clockwise rotate.The shifting block 105 that stretches out on the inner peripheral surface of clutch outer 86 is stirred one of them rolling element 88 and is moved, leave the slope on the clutch outer 86, and only by another locational rolling element 88 and slope against or throw off and realize the fixing of second ring gear 72 and rotate.Switch bar 108 is in backward position shown in the accompanying drawing 4, and clutch switch boards 106 is struck and clockwise rotates around pivot, and then drives the clutch outer 86 be provided with clutch shifter 104 and rotate counterclockwise.The shifting block 105 that stretches out on the inner peripheral surface of clutch outer 86 is stirred another locational rolling element, leaves the slope on the clutch outer 86, by relative rolling element and slope against or throw off and realize the fixing of second ring gear 72 and rotate.
When motor just changes, when transmission device 46 is in the top gear gear, clockwise rotate at second ring gear 72 clutch inner ring 89 under the drive of first planet carrier 60, since shifting block 105 with clockwise direction near the relative barrier of roller of slope away from slope, the roller that works can be away from slope under the drive of clutch inner ring 89, and clutch inner ring 89 can rotate relative to clutch outer 86 under the drive of second ring gear 72.This moment, output shaft 47 was in fast state.
When the instrument load changes, when needing transmission device 46 that low-speed big output is provided, second ring gear 72 separates with first planet carrier 60, second ring gear 72 has the trend that rotates counterclockwise, clutch inner ring 89 also has the trend that rotates counterclockwise under the drive of second ring gear 72, thereby make the roller that works and slope against, clutch inner ring 89 and clutch outer 86 are combined as a whole under the effect of roller, casing 41 is fixing relatively.Because second ring gear 72 and annular connector 63 engagements, second ring gear 72 is locked by relative together with annular connector 63.This moment, output shaft 47 was in lower-speed state.
Same, when motor reversed, clutch inner ring 89 also can be realized annular connector in locational locking of different operating and driving under the effect of clutch switch boards 106.
Shown in accompanying drawing 5 and 6, electric drill is used the embodiment of the control module of another kind of switching mechanism.Electric drill comprises motor 42, starts/stop switch 50, output shaft 47 and the transmission device 46 of motor.Transmission structures among the structure of transmission device and first embodiment is basic identical, and control module is located in the casing 41, comprises control circuit 100 and the actuator of the signal controlling sent by control circuit 100.The actuator of present embodiment is to adopt electromagnet apparatus 110, electromagnet apparatus 110 comprise the lengthwise setting metal shell, be arranged on two coils 116 distributing along longitudinally in the metal shell, be arranged on two between the coil 116 permanent magnet 114, be arranged on by in coil 116 region surrounded and can be along the linearly moving iron core 112 of longitudinally, and fixedly install and lengthwise extends the outer impeller 118 of metal shell with respect to iron core 112.Wherein, impeller 118 fore-end that protrudes out metal shell links to each other with shift block 120.Be that impeller 118 and iron core 112 also can be wholely set for what those of ordinary skills can expect easily.Shift block 120 links to each other with impeller 118, and annular connector 63 and shift block 120 and the steel wire cover 122 that is sheathed on the shift block 120 link to each other, and setting is held steel wire and overlapped 122 accepting groove it on.
With reference to accompanying drawing 7, control circuit 100 links to each other with motor 42 with power supply 44, comprises detecting unit 124, is used to detect the parameter of motor 42, such as the variation of voltage, electric current or power etc.Control circuit 100 comprises comparing unit 126, is used to receive the detected parameters of detecting unit 124 and changes, and with the variation of parameter and a predetermined numeric ratio, when corresponding changing value surpasses predetermined numerical value, export comparative result.Control circuit 100 also comprises signal generating unit 128, is used to receive the comparative result that comparing unit 126 sends, and sends control signal according to comparative result.After electromagnet apparatus 110 receives control signal, polarity according to control signal change electromagnet moves axially impeller 118, thereby drive shift block 120 and steel wire cover 122 move, and then mobile annular connector 63, change rotating speed and moment of torsion that transmission device 46 is exported.Those skilled in the art will be appreciated that, specifically being provided with of control circuit can have different situations of change, according to the needs that use, can increase other control module or replacement certain unit wherein, such as, set up an arithmetic element between detecting unit and the comparing unit, further mathematical conversion is carried out in the variation of parameter, and the conversion result is exported.
When electric tool was in the speed automatic switchover mode, the processor of control system detected the variation of the physical parameter of electric tool, compares with preset value, judges whether need begin to carry out fluid drive.Those skilled in the art also external discharge circuit of available processors replace processor to compare computing.Physical parameter described here can be an electric parameter, such as motor current, voltage, also can be other parameters, such as the stress of motor or output shaft rotating speed, machine components, moment of torsion etc.
In the fluid drive process, control module sends control signal and gives actuator, and actuator drives driving member and moves, and then second ring gear 72 in the transmission device 46 is moved to low gear from high gear.In this process,, can not produce dozen tooth problem between the primary importance and the second place owing to be provided with between second ring gear 72 and the casing 41 in the process that clutch 84, the second ring gears 72 move.
Impeller 118 in the electromagnet apparatus 110 shown in Fig. 6 is in progressive position, and promptly impeller 118 extends the longer distance of metal shell outward, and owing to the attraction of permanent magnet 114 remains on this position.At this moment, the speed reducing ratio of transmission device 46 is lower, and motor 42 is higher by the rotating speed that passes to output shaft 47 behind the reduction box, that is to say, the engagement of the annular connector 63 and first planet carrier 60 and guarantee relative fixed, and can be with first planet carrier 60 and 72 rotations of second ring gear.Cooperation is with reference to Fig. 5, and behind logical forward current in the coil 116 of electromagnet apparatus 110, the magnetic field that coil 116 produces produces different magnetic poles at the lengthwise two ends of metal shell, thereby driving iron core 112 and impeller 118 move to going-back position.Impeller 118 drives shift block 120, steel wire cover 122 and annular connector 63 and moves a certain distance together.In this process, annular connector 63 moves vertically and breaks away from engagement with first planet carrier 60, but still keeps engagement with second ring gear 72.When impeller 118 moved to going-back position, the speed reducing ratio of transmission device 46 had increased one-level, thereby motor 42 is lower by the rotating speed that passes to output shaft behind the reduction box.
Claims (10)
1. electric tool comprises:
Casing;
Be located at the motor that rotary power is provided in the casing;
Receive first driving section of the input torque of motor output, it comprises first ring gear;
Second driving section that links to each other with first driving section, it comprises second ring gear;
Annular connector is connected to second ring gear and can and produces axially-movable between the second place of second transmission output in the primary importance that produces first transmission output;
The output shaft that links to each other with second driving section;
It is characterized in that,
Described electric tool also comprises control circuit and actuator, and input torque is during greater than preset value, and control circuit control actuator drives annular connector and moves to the second place from primary importance, thus the different rotary speed of output shaft output.
2. electric tool according to claim 1 is characterized in that: described electric tool comprises the rotating switch bar of the rotation direction of controlling motor, is provided with the clutch switch boards between described clutch and the rotating switch bar and makes the clutch single effect.
3. electric tool according to claim 1 is characterized in that: described clutch comprises the outer ring that links to each other with casing, the inner ring that links to each other with second ring gear and be located at the outer ring and inner ring between rolling element.
4. electric tool according to claim 1 is characterized in that: described actuator comprises electromagnet apparatus.
5. electric tool according to claim 4 is characterized in that: described electromagnet apparatus comprise the lengthwise setting metal shell, be arranged on the coil that distributes along longitudinally in the metal shell, be arranged on permanent magnet between the coil, be arranged on by in the coil region surrounded and can be along linearly moving iron core of longitudinally and the impeller that links to each other with annular connector.
6. electric tool according to claim 1, it is characterized in that: described actuator comprises servo motor and pushing block, the rotation direction control pushing block that the control circuit output signal changes servo motor moves axially, thereby annular connector is moved between the primary importance and the second place.
7. electric tool according to claim 6 is characterized in that: be provided with screw rod between described servo motor and the pushing block, pushing block is provided with screw thread, makes pushing block linear mobile thereby servo motor drives the screw rod rotation.
8. electric tool according to claim 1 is characterized in that: described control circuit comprises detecting unit, is used to detect the variation of the load parameter of output shaft; Comparing unit compares the changing value of the load parameter of detecting unit output and predetermined numerical value; Signal generating unit receives the comparative result of comparing unit output and sends control signal according to comparative result.
9. electric tool according to claim 8, it is characterized in that: described control circuit comprises that also arithmetic element carries out mathematical conversion to the variation of load parameter, and exporting the conversion result to comparing unit, comparing unit compares conversion result and another predetermined numerical value.
10. electric tool according to claim 8 is characterized in that: the load parameter of described output shaft is electric current or the voltage or the power of motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200043019U CN201664774U (en) | 2010-01-14 | 2010-01-14 | Electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200043019U CN201664774U (en) | 2010-01-14 | 2010-01-14 | Electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201664774U true CN201664774U (en) | 2010-12-08 |
Family
ID=43265728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010200043019U Expired - Lifetime CN201664774U (en) | 2010-01-14 | 2010-01-14 | Electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201664774U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104156013A (en) * | 2013-05-13 | 2014-11-19 | 南京德朔实业有限公司 | Method for controlling torsion force output of DC electric tool |
| CN108687705A (en) * | 2017-04-08 | 2018-10-23 | 刘志斌 | Spanner is cut in torsion |
| WO2022166803A1 (en) * | 2021-02-04 | 2022-08-11 | 南京泉峰科技有限公司 | Electric screwdriver |
-
2010
- 2010-01-14 CN CN2010200043019U patent/CN201664774U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104156013A (en) * | 2013-05-13 | 2014-11-19 | 南京德朔实业有限公司 | Method for controlling torsion force output of DC electric tool |
| CN108687705A (en) * | 2017-04-08 | 2018-10-23 | 刘志斌 | Spanner is cut in torsion |
| WO2022166803A1 (en) * | 2021-02-04 | 2022-08-11 | 南京泉峰科技有限公司 | Electric screwdriver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101208 |
|
| CX01 | Expiry of patent term |