CN201799979U - Electric screwdriver with magnetic overload protector - Google Patents
Electric screwdriver with magnetic overload protector Download PDFInfo
- Publication number
- CN201799979U CN201799979U CN2010202004697U CN201020200469U CN201799979U CN 201799979 U CN201799979 U CN 201799979U CN 2010202004697 U CN2010202004697 U CN 2010202004697U CN 201020200469 U CN201020200469 U CN 201020200469U CN 201799979 U CN201799979 U CN 201799979U
- Authority
- CN
- China
- Prior art keywords
- sleeve
- permanent magnet
- driving shaft
- shift fork
- housing
- 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.)
- Expired - Fee Related
Links
- 230000001012 protector Effects 0.000 title claims abstract description 10
- 230000007613 environmental effect Effects 0.000 abstract description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 240000008866 Ziziphus nummularia Species 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
The utility model discloses an electric screwdriver with a magnetic overload protector, which comprises a housing, a motion transfer mechanism and a screwdriver head component, wherein the motion transfer mechanism comprises a motor, a motor gear, a driving shaft gear and a driving shaft; and the screwdriver head component comprises a screwdriver head, an output shaft connected with a mounting groove and a head cover. A sleeve is mounted at one end of a driving shaft, which is close to the screwdriver head; more than two large permanent magnets are mounted outside the sleeve at equal intervals; small permanent magnets, the number of which is the same with that of the large permanent magnets, are mounted on the output shaft positioned in the sleeve at equal intervals; a U-shaped shift fork is inserted from the outside of the housing and then fixedly connected with two end surfaces of the sleeve; and the U-shaped shift fork can drive the sleeve to slide axially on the driving shaft. The magnetic overload protector is simple in structure, and can effectively realize overload protection function, avoid friction and noise, realize greenness and environmental protection, and different limit torques are set by adjusting the shift fork on the housing.
Description
Technical field
The utility model relates to hand held electric tool, especially relates to a kind of electric screw driver with magnetic force overload protector.
Background technology
At present, though the kind of electric screw driver is many on the market, the overload protective device great majority that they adopt are the mechanical type control method still, promptly castellated overload protective device, and by master and slave moving part tooth engagement, driven member rotates under driving link drives thereupon.As the patent No.: in 200710070176.4; what adopt is mechanical type sour jujube tooth clutch; maximum shortcoming can produce noise exactly, and can since between tooth repeatedly friction and bump make the overload protective device life-span reduce greatly, the service life that the while has also been reduced electric screw driver.All very complicated as the overload clutch structure among the patent No.: the 99229360.X, 200620106541.3 and 200720112276.4, exist assembling difficulty, the problems such as cost height made.
Summary of the invention
The purpose of this utility model is to provide a kind of electric screw driver with magnetic force overload protector; this overload protecting mechanism has utilized the contactless torque transfering characteristic between two groups of annular permanent magnets; when the torque of bearing when driver bit has surpassed specified torque; driver bit stops operating; and motor shaft can be rotated further and can not be damaged; to reach the purpose of overload protection, the relative area that can change two groups of annular permanent magnets simultaneously by the position of adjusting the U-shaped shift fork is set different breakdown torques.
The technical scheme that its technical problem that solves the utility model adopts is:
The utility model comprises housing, the movement transferring of being made up of motor, motor gear, axle shaft gear and driving shaft, the driver bit assembly that output shaft that is connected with mounting groove by driver bit and head-shield are formed; Installing sleeve on the close end of driver bit of driving shaft, sleeve is uniformly-spaced installed plural big permanent magnet outward, be positioned at the little permanent magnet of uniformly-spaced installing on the output shaft of sleeve with big permanent magnet same number, the U-shaped shift fork inserts the back from the housing outside and fixedlys connected with the sleeve both ends of the surface, and the U-shaped shift fork drives sleeve and can be in axial sliding on driving shaft.
Described big permanent magnet and little permanent magnet are respectively 2-10.
The interior ring magnetic of described big permanent magnet is opposite with the outer shroud magnetic polarity of little permanent magnet.
The utility model is compared the beneficial effect that has with background technology:
Hand held electric tool of the present utility model has magnetic force overload protector; when the torque of bearing when driver bit surpasses nominal torque; because the contactless property of magnetic drives; driver bit can stop operating; and that motor can be rotated further is unaffected; can avoid the suffered torque of screw to continue to increase and broken like this; simultaneously also can make operating personnel avoid being subjected to bigger anti-torque; can reach the purpose of overload protection effectively; and this overload protective device is simple in structure; there is not friction; impact little; noiseless; environmental protection; prolonged service life greatly, and can be according to the torque of concrete needs accommodation limit.
Description of drawings
Fig. 1 is the structural principle schematic diagram of electric screw driver.
Fig. 2 is the magnetic force overload schematic diagram.
Fig. 3 is the A-A cutaway view of Fig. 2.
Fig. 4 is permanent magnet and permanent magnet magnetic pole distribution schematic diagram.
Among the figure: 1, driver bit, 2, mounting groove, 3, head-shield, 4, bearing, 5, little permanent magnet, 6, bearing, 7, driving shaft, 8, axle shaft gear, 9, bearing, 10, motor, 11, motor gear, 12, housing, 13, sleeve, 14, the U-shaped shift fork, 15, big permanent magnet, 16, output shaft.
The specific embodiment
As shown in Figure 1 and Figure 2, the utility model comprises housing 12, the movement transferring of forming by motor 10, motor gear 11, axle shaft gear 8 and driving shaft 7, the driver bit assembly that output shaft 16 that is connected with mounting groove 2 by driver bit 1 and head-shield 3 are formed.Installing sleeve 13 on driving shaft 7 close ends of driver bit 1, plural big permanent magnet 15 uniformly-spaced is installed outside the sleeve 13, in the present embodiment be 4, little permanent magnet 5 with big permanent magnet 15 same number uniformly-spaced is installed on the output shaft 16 that is positioned at sleeve 13, U-shaped shift fork 14 inserts the back and fixedlys connected with sleeve 13 both ends of the surface from housing 12 outsides, U-shaped shift fork 14 drives sleeve 13 and can be in axial sliding on driving shaft 7, as shown in Figure 3, what adopt in the present embodiment is that spline connects, and is to be dynamically connected.
As shown in Figure 4, the interior ring magnetic of described big permanent magnet 15 is opposite with the outer shroud magnetic polarity of little permanent magnet 5, and promptly little permanent magnet 5 outer shroud magnetic poles are the S utmost point, and the interior ring magnetic pole of then big permanent magnet 15 is the N utmost point, otherwise perhaps.
The utility model operation principle is as follows:
As shown in Figure 1, in the housing 12 of electric screw driver motor 10 is housed, when motor 10 rotates, motor gear 11 on the armature shaft of motor 10 and 8 engagements of the axle shaft gear on the driving shaft 7, on the bearing 6 of driving shaft 7 two end supports in housing 12, the bearing 9, be delivered on the driving shaft 7 thereby will rotatablely move.
As Fig. 1, Fig. 2, shown in Figure 3, be connected by spline between sleeve 13 and the driving shaft 7, big permanent magnet 15 is fixed on the sleeve 13, when driving shaft 7 rotates, big permanent magnet 15 will rotate thereupon, the little permanent magnet 5 of another piece is fixed on the output shaft 16, and output shaft 6 itself is fixed in the housing 12 by bearing 4.Because the torque of magnetic force effect between two block permanent magnets, big permanent magnet 15 can drive little permanent magnet 5 and rotate, rotate thereby drive output shaft 16, connect the driver bit assembly on the output shaft 16, thereby can drive driver bit 1 work.
When driver bit 1 suffered load torque has surpassed specified torque; because between two groups of permanent magnets is contactless transmitting torque; output shaft 16 and driver bit 1 all can stop operating; and motor 10 and driving shaft 7 are rotated further; can avoid motor to damage like this and screw is subjected to excessive moment and damages, reach the purpose of overload protection.Between sleeve 13 and the driving shaft 7 is to be dynamically connected, and can reach the position of change sleeve 13 with respect to driving shaft 7, thereby change two relative areas between the annular permanent magnet, thereby reach the purpose that changes breakdown torque by stirring the U-shaped shift fork 14 on the housing 12.
Claims (3)
1. electric screw driver with magnetic force overload protector, comprise housing (12), the movement transferring of forming by motor (10), motor gear (11), axle shaft gear (8) and driving shaft (7), the driver bit assembly that output shaft (16) that is connected with mounting groove (2) by driver bit (1) and head-shield (3) are formed; It is characterized in that: installing sleeve (13) on the close end of driver bit (1) of driving shaft (7), the outer plural big permanent magnet (15) of uniformly-spaced installing of sleeve (13), little permanent magnet (5) with big permanent magnet (15) same number uniformly-spaced is installed on the output shaft that is positioned at sleeve (13) (16), U-shaped shift fork (14) inserts the back from housing (12) outside and fixedlys connected with sleeve (13) both ends of the surface, and U-shaped shift fork (14) drives sleeve (13) and can be in axial sliding on driving shaft (7).
2. a kind of electric screw driver with magnetic force overload protector according to claim 1 is characterized in that: described big permanent magnet (15) and little permanent magnet (5) are respectively 2-10.
3. a kind of electric screw driver with magnetic force overload protector according to claim 1 is characterized in that: the interior ring magnetic of described big permanent magnet (15) is opposite with the outer shroud magnetic polarity of little permanent magnet (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202004697U CN201799979U (en) | 2010-05-21 | 2010-05-21 | Electric screwdriver with magnetic overload protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202004697U CN201799979U (en) | 2010-05-21 | 2010-05-21 | Electric screwdriver with magnetic overload protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201799979U true CN201799979U (en) | 2011-04-20 |
Family
ID=43869496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202004697U Expired - Fee Related CN201799979U (en) | 2010-05-21 | 2010-05-21 | Electric screwdriver with magnetic overload protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201799979U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112020408A (en) * | 2018-04-26 | 2020-12-01 | 阿特拉斯·科普柯工业技术公司 | Electric tool for tightening threaded joint |
-
2010
- 2010-05-21 CN CN2010202004697U patent/CN201799979U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112020408A (en) * | 2018-04-26 | 2020-12-01 | 阿特拉斯·科普柯工业技术公司 | Electric tool for tightening threaded joint |
| CN112020408B (en) * | 2018-04-26 | 2022-04-05 | 阿特拉斯·科普柯工业技术公司 | Electric tool for tightening threaded joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20140521 |