CN201320751Y - Electric tool with brake device - Google Patents
Electric tool with brake device Download PDFInfo
- Publication number
- CN201320751Y CN201320751Y CNU2008201163167U CN200820116316U CN201320751Y CN 201320751 Y CN201320751 Y CN 201320751Y CN U2008201163167 U CNU2008201163167 U CN U2008201163167U CN 200820116316 U CN200820116316 U CN 200820116316U CN 201320751 Y CN201320751 Y CN 201320751Y
- Authority
- CN
- China
- Prior art keywords
- clutch
- rotating shaft
- electric tool
- instrument
- check plate
- 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
Images
Landscapes
- Sawing (AREA)
Abstract
The utility model relates to an electric tool with a cutting tool brake device, which comprises a cutting tool brake device including a clutch device and at least a stop device, and the stop device can be positioned at a first position and a second position. When the stop device is positioned at the first position, the clutch device is meshed, a motor driving shaft transmits the power of a motor to the rotating shaft of a tool through the clutch device; and when the stop device is positioned in the second position, the clutch device is detached, and the stop device brakes the rotating shaft of the tool.
Description
Technical field
The utility model relates to a kind of electric tool, especially, relates to a kind of electric tool of strap brake device.
Background technology
Electric tool has been widely used in the daily life, and the requirement of the processing safety of electric tool is also improved constantly.Such as, for annular saw, electric cutting tools such as bench saw, after the user cut off the electricity supply, saw blade was because inertia still can be rotated further, and this has just caused potential security threat.Therefore, the brake gear that saw blade has been installed on a lot of electric tools is eliminated this potential threat.
U.S. Pat 7138737 has disclosed a kind of brake apparatus, and this device is by the fast braking of the rotor of motor being finished the fast braking to saw blade.This device is particularly suitable for the DC series excitation motor.This device comprises a brake component, and a brake block is housed on this brake component, and this brake block is pushed down rotor on its application position brake rotor.
U.S. Pat 6731034 has disclosed a kind of brake apparatus of Electromagnetic Control.When dump, brake arm is pressed onto on the rotor by compression spring, causes the braking of rotor.This brake apparatus is opened automatically along with the cut-out of the power supply of motor.
But during the braking of above-mentioned brake gear, all be to lead to rotor is applied a brake force and rotor is braked by force, in this process, the rotor of motor and commutator all may suffer damage.In addition, because directly to the rotor braking, therefore, brake apparatus must be installed in motor internal, very complicated on the structure, production cost is bigger, in case and the brake apparatus inefficacy, then need to change whole motor.
Summary of the invention
The purpose of this utility model is to provide brake gear a kind of simple in structure, safe and reliable, and in a single day this brake gear be damaged and after losing efficacy, and can only change to be arranged on the brake gear outside the motor and not need to change whole motor.
To achieve these goals, the electric tool of band cutting tool brake gear of the present utility model comprises a motor driving shaft, an instrument is installed the transmission device that rotating shaft and connects motor driving shaft and instrument installation rotating shaft, and the instrument that a cutting instrument is installed on is installed in the rotating shaft and can be rotated thereupon.This electric tool also comprises a brake gear, brake gear comprises an arrangement of clutch that is arranged on the transmission device and is movable to the stop device of a primary importance and a second place with at least one, arrangement of clutch comprises a positive clutch and a cloudy clutch, be connected the partial fixing connection of motor driving shaft in sun clutch and cloudy clutch in the two one and the transmission device, the part of fastening means installation rotating shaft is circumferentially fixed and is in axial sliding connection in the two another and the transmission device, when at least one stop device is in primary importance, the arrangement of clutch engagement; When at least one stop device was in the second place, arrangement of clutch broke away from engagement.Therefore, when stop device was in primary importance, motor driving shaft was delivered to the power of motor in the instrument rotating shaft to arrangement of clutch by this.When stop device was in the second place, instrument was installed the power drive that rotating shaft breaks away from motor, and this stop device is installed rotating shaft moment braking with instrument simultaneously.At this moment, motor driving shaft also can be rotated further after the several seconds because of inertia and stop operating naturally.
Because motor driving shaft can not braked by force in brake process, but allows it stop operating naturally, this has just been avoided the infringement of brake gear to rotor and commutator, thereby has prolonged service life.And this arrangement of clutch is arranged on the periphery rather than the motor internal of motor, when this arrangement of clutch is damaged, only needs to change arrangement of clutch, and needn't open even change motor itself.
Description of drawings
Fig. 1 is the schematic diagram of the electric circular saw that disclosed in a kind of first-selected embodiment of the present utility model;
Fig. 2 is the explosive view of the saw blade brake gear of electric circular saw shown in Fig. 1;
Fig. 3 is the stereogram of the saw blade brake gear among Fig. 2, and this moment, this brake gear was in not normal danger;
Fig. 4 is the stereogram of the saw blade brake gear among Fig. 2, and this moment, this brake gear was in normal danger;
Fig. 5 is saw blade brake gear another stereogram on normal danger among Fig. 4;
Fig. 6 is another stereogram of the saw blade brake gear among Fig. 2, moves on the position of brake on the position that this moment, check plate just never braked.
Wherein:
The 100-motor driving shaft;
The 200-saw blade is installed rotating shaft;
The 2-fan;
The 3A-lower gear;
The 3B-gear wheel;
The cloudy clutch of 4-;
5-sun clutch;
The 6-back-moving spring;
The 7-jump ring;
The 8-saw blade;
The 9-check plate.
The specific embodiment
In the first-selected embodiment of the present utility model, be that example describes with the electric circular saw.
As depicted in figs. 1 and 2, electric circular saw 1 comprises a casing, wherein accommodates drive motors and transmission device, also comprises the saw blade that is used for cut workpiece 8 that is installed on the transmission device output shaft.The power of motor is delivered on the gear wheel 3B with the pinion 3A that is positioned at these motor driving shaft 100 ends by motor driving shaft 100.Between this gear wheel 3B and saw blade rotating shaft 200, be provided with arrangement of clutch.This arrangement of clutch comprises a pair of clutch counterpart: cloudy clutch 4 and positive clutch 5.This moon clutch 4 and gear wheel 3B fixed installation, 5 on positive clutch circumferentially fixedly mount with saw blade rotating shaft 200, but can slide in saw blade is installed the axial certain limit of rotating shaft 200.Engagement can take place with this moon clutch 4 by the mode of precession and rotate in this sun clutch 5.Between positive clutch 5 and saw blade rotating shaft 200, also be provided with a back-moving spring 6 and a jump ring 7.In addition, this arrangement of clutch also comprises a check plate 9 that is used to control this arrangement of clutch duty.
When the arrangement of clutch of electric circular saw is on the position of not braking, as Fig. 3 and shown in Figure 6, when check plate 9 is positioned at primary importance, check plate 9 does not contact with clutch, say exactly, be connected the positive clutch 5 that the part of saw blade rotating shaft 200 is connected and do not contact in the incision position 9A of check plate 9 and the clutch with in the transmission device, the fastener position 9B of check plate 9 does not contact with positive clutch 5 yet.Because the effect of back-moving spring 6, sun clutch 5 is extruded in the cloudy clutch 4, when electric motor starting, the gear wheel 3B that is driven by pinion 3A drives the cloudy clutch 4 that is positioned at wherein simultaneously, because positive clutch 5 closely is squeezed on the cloudy clutch 4 by spring 6, so positive clutch 5 also rotates thereupon, and transmission of power installed rotating shaft 200 to saw blade, rotate so that implement cutting operation thereby drive saw blade.
When the arrangement of clutch of electric circular saw is on the position of brake, as shown in Figure 4 and Figure 5, when check plate 9 is positioned at the second place, be connected positive clutch 5 contacts that the part of saw blade rotating shaft 200 is connected in the incision position 9A of check plate 9 and the clutch with in the transmission device, check plate 9 is cut between cloudy clutch 4 and the positive clutch 5 under external force, and the fastener position 9B of check plate 9 closely contacts with positive clutch 5.Referring now to Fig. 6 with shown in Figure 5 brake process is described.When the saw blade 8 of electric circular saw need be braked, check plate 9 is close clutch under the effect of external force at first, the vertical plane that the axis of rotating shaft 200 is installed with respect to saw blade in one side of the incision position 9A of check plate 9 has a suitable angle of inclination, this incision position 9A cuts between cloudy clutch 4 and the positive clutch 5, positive clutch 5 is applied an axial force that makes it to take place with cloudy clutch 4 disengaging, positive clutch 5 is constantly pushed to the direction that breaks away from cloudy clutch 4 engagements.After the engagement of positive clutch 5 disengagings and cloudy clutch 4, saw blade is installed rotating shaft 200 no longer by motor-driven, and the fastener position 9B of check plate 9 tightly blocks the groove of positive clutch 5 peripheries at this moment.So saw blade is installed rotating shaft 200 and 8 moments of saw blade are braked.First-selected ground, saw blade braking and motor deenergization almost take place simultaneously, at this moment, motor still can rotate owing to effect of inertia, that is to say, when saw blade is installed rotating shaft 200 when being braked, motor driving shaft 100, pinion 3A, gear wheel 3B and be positioned at wherein cloudy clutch 4 and still can continue to rotate the several seconds and stop.
In this process, motor driving shaft 100 can not braked by force, but allows it stop operating naturally, and this just can not damage because of brake rotor and commutator, thereby has prolonged complete machine service life.And this arrangement of clutch is arranged on the outside rather than the motor internal of motor, when this arrangement of clutch is damaged, such as, the generation of redivision and reunion of YIN and YANG device is worn and torn and was lost efficacy, and only needs to change clutch gear, and needn't open even change motor itself.
In the process of saw blade brake, check plate 9 need be cut between the redivision and reunion of YIN and YANG device under the effect of an external force, and requires this moment the power supply of motor to disconnect, so the power switch of electric circular saw control device best and check plate 9 links.Control power supply and check plate 9 simultaneously such as utilizing a trigger.The course of work is: when this trigger was pulled, motor power was connected, and check plate 9 is pulled and does not contact with clutch simultaneously, like this, clutch meshes under the effect of back-moving spring 6, and the power of motor passes to the saw blade rotating shaft by clutch, thereby realizes cutting.When finishing cutting, when unclamping trigger, motor power is cut off, simultaneously check plate 9 is such as the isostructural effect of torsion spring incision of following moment clutch, the clutch top and the bottom are broken away from, and fastener divides in the groove that 9B also sticks into positive clutch 5 peripheries simultaneously, and the saw blade rotating shaft is braked.
In other embodiments, between positive clutch 5 and saw blade installation rotating shaft 200, can also be provided with more driving member, between motor driving shaft 100 and cloudy clutch 4, also can be provided with more driving member, also can also adopt the arrangement of clutch of other adequate types or structure to substitute arrangement of clutch in this first-selected embodiment in addition, can also adopt the transmission device of other adequate types or structure to substitute transmission device in this first-selected embodiment.
Certainly, the control device of check plate 9 can be mechanical structures such as torsion spring, also can be structure or other similar structures of electromagnetic type.
Certainly, the mode of check plate 9 braking saw blade rotating shafts 200 is not limited to the mode of dividing 9B to block the peripheral grooves of positive clutch 5 with fastener, also can use cotter way to cooperate or other similar position limiting structures.In addition, the quantity of check plate 9 also is not limited to one, can strengthen stopping power like this for a pair of or a plurality of.
Certainly, the utility model is not limited to be applied in saw series products such as electric circular saw, bench saw, also can be applied on the electric tools such as angle mill, sweep-saw, sabre saw, to strengthen the security of these electric tools.
The concrete scheme that the utility model is not limited to above to reach accompanying drawing and is disclosed can also have other mode.Need to prove that above embodiment is nonrestrictive.Except this embodiment, the conversion that all those skilled in the art carry out according to general knowledge all drops in the protection domain of the present utility model.
Claims (7)
1. the electric tool of a strap brake device, comprise a motor driving shaft, one instrument is installed rotating shaft, and one connect described motor driving shaft and described instrument is installed the transmission device of rotating shaft, one cutting instrument is installed in the described instrument installation rotating shaft and can rotates thereupon, it is characterized in that, described electric tool also comprises a brake gear, described brake gear comprises an arrangement of clutch that is arranged on the described transmission device and is movable to the stop device of a primary importance and a second place with at least one, described arrangement of clutch comprises a positive clutch and a cloudy clutch, the partial fixing that is connected described motor driving shaft in described positive clutch and cloudy clutch in the two one and the described transmission device connects, being connected described instrument in the two another and the described transmission device, that the part of rotating shaft is installed is circumferentially fixing and be in axial sliding connection, when described at least one stop device is in described primary importance, described arrangement of clutch engagement; When described at least one stop device was in the described second place, described arrangement of clutch broke away from engagement.
2. the electric tool of strap brake device according to claim 1 is characterized in that, described electric tool also comprises the control device of the described brake gear of a control and the switch of a control motor power.
3. the electric tool of strap brake device according to claim 2 is characterized in that, the control device of described brake gear and the switch gearing of described motor power.
4. according to the electric tool of each described strap brake device among the claim 1-3, it is characterized in that described stop device is a check plate, described check plate comprises an incision position and a fastener position.
5. the electric tool of strap brake device according to claim 4 is characterized in that, the incision position of described check plate comprises a hypotenuse, and this hypotenuse becomes certain angle of inclination with the vertical plane that described instrument is installed the axis of rotating shaft.
6. the electric tool of strap brake device according to claim 5, it is characterized in that, when described stop device is positioned at described primary importance, is connected described instrument and the clutch part that the part of rotating shaft is connected is installed does not contact in the incision position of described check plate and the described clutch with in the described transmission device; When described stop device is positioned at the described second place, is connected described instrument the clutch part contact that the part of rotating shaft is connected is installed in the incision position of described check plate and the described clutch with in the described transmission device.
7. the electric tool of strap brake device according to claim 6, it is characterized in that, when described stop device is positioned at described primary importance, is connected described instrument and the clutch part that the part of rotating shaft is connected is installed does not contact in the fastener position of described check plate and the described clutch with in the described transmission device; When described stop device is positioned at the described second place, is connected described instrument and the clutch part that the part of rotating shaft is connected is installed closely contacts in the fastener position of described check plate and the described clutch with in the described transmission device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201163167U CN201320751Y (en) | 2008-05-08 | 2008-05-08 | Electric tool with brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201163167U CN201320751Y (en) | 2008-05-08 | 2008-05-08 | Electric tool with brake device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201320751Y true CN201320751Y (en) | 2009-10-07 |
Family
ID=41158139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201163167U Expired - Fee Related CN201320751Y (en) | 2008-05-08 | 2008-05-08 | Electric tool with brake device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201320751Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020064524A1 (en) * | 2018-09-27 | 2020-04-02 | Robert Bosch Gmbh | Safety braking device |
-
2008
- 2008-05-08 CN CNU2008201163167U patent/CN201320751Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020064524A1 (en) * | 2018-09-27 | 2020-04-02 | Robert Bosch Gmbh | Safety braking device |
| CN112770871A (en) * | 2018-09-27 | 2021-05-07 | 罗伯特·博世有限公司 | Safety brake device |
| US11673218B2 (en) | 2018-09-27 | 2023-06-13 | Robert Bosch Gmbh | Safety braking device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101933443B (en) | Cutting tools | |
| CN201179671Y (en) | Electric chain saw | |
| EP2602504B1 (en) | Planetary or epicyclic gear assembly with protection clutch | |
| TW200637746A (en) | Straddle type hybrid vehicle | |
| CN101337357B (en) | Electric chain saw | |
| CN202674185U (en) | Small-tooth-difference engagement type gear speed reducer | |
| CN201586785U (en) | Metal cable clipper | |
| CN201320751Y (en) | Electric tool with brake device | |
| CN103252267A (en) | Double-shaft differential material crusher | |
| JP4229765B2 (en) | Wind turbine blade pitch angle control device | |
| CN209737252U (en) | Fracture grinding device after aluminum profile is cut off | |
| CN103486150A (en) | Protection clutch | |
| CN201195277Y (en) | Hand-hold electric slicer shaft coupling transmission device | |
| CN108895120B (en) | Bevel gear transmission pair engagement and disengagement device | |
| CN201063485Y (en) | Torque adjustable electromagnetic braking motor | |
| CN202395595U (en) | Turning structure of jaw structure reversed automatic protection releasing generator | |
| CN201998147U (en) | Anti-overload impact drill | |
| CN201478988U (en) | Power generating device | |
| CN204772667U (en) | Kinetic energy rotates cutter head | |
| CN211105039U (en) | Rubber slitter driven by permanent magnet planetary reducer | |
| CN102462900A (en) | Multifunctional barrier-breaking rescue equipment | |
| CN101969251A (en) | Constant rotating speed device | |
| CN101508037A (en) | Large-torsion notching cutter | |
| CN202663811U (en) | Braking structure of electrical mower | |
| CN201772026U (en) | Rotational speed limiting device |
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: 20091007 Termination date: 20130508 |