CN201558979U - Electric tool - Google Patents
Electric tool Download PDFInfo
- Publication number
- CN201558979U CN201558979U CN2009201339489U CN200920133948U CN201558979U CN 201558979 U CN201558979 U CN 201558979U CN 2009201339489 U CN2009201339489 U CN 2009201339489U CN 200920133948 U CN200920133948 U CN 200920133948U CN 201558979 U CN201558979 U CN 201558979U
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- China
- Prior art keywords
- carbon brush
- power supply
- contact
- switch
- motor
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- 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 - Lifetime
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Abstract
The utility model provides an electric tool which comprises a shell, a direct current (DC) motor arranged inside the shell, a retarding mechanism connected with the output shaft of the motor, and a tool head driven by the retarding mechanism, wherein the motor comprises a commutator installed on the output shaft, a sharing carbon brush, a high-speed carbon brush, a low-speed carbon brush, at least one direct current (DC) power supply, and a switching unit connected with the carbon brush and the power supply; when the switching unit is communicated with the power supply, the sharing carbon brush and the high-speed carbon bush, the output shaft of the motor runs at high speed, thus leading the tool head to work with higher speed; and when the switching unit is communicated with the power supply, the sharing carbon brush and the low-speed carbon brush, the output shaft of the motor runs at low speed, thus leading the tool head to work with lower speed. As the switching unit can select different carbon brushes and corresponding power combination or resistance arrangement, different motor output speeds are obtained, and the series of a back-connection gear box can be reduced, thus simplifying the back-connection gear box.
Description
Technical field
The utility model relates to a kind of electric tool.
Background technology
General electric tool, motor output shaft connect multi-stage gear usually and slow down, so that motor is applicable to different speed occasions.In when boring, require the electric drill head to have higher output speed as electric drill, and, require drill bit to have relatively low output speed when electric drill during in the turn of the screw.Yet, existing mode of slowing down by multi-stage gear, the complex structure of gear-box, cost is higher.
For this reason, the utility model aims to provide a kind of electric tool that improves the problems referred to above.
Summary of the invention
The utility model also provides a kind of electric tool to comprise: housing, be installed in the motor in the housing, the reducing gear that links to each other with motor output shaft, the tool heads that driven by reducing gear, described motor is a d.c. motor, comprise the commutator that is installed on the motor output shaft, shared carbon brush, use carbon brush at a high speed, the low speed carbon brush, at least one dc source, and the switching device of described carbon brush of connection and power supply, when switching device is communicated with described power supply, when shared carbon brush is used carbon brush with high speed, thereby described motor output shaft rotates at a relatively high speed and makes tool heads work at a relatively high speed, when switching device is communicated with described power supply, when shared carbon brush and low speed are used carbon brush, thereby described motor output shaft is to make tool heads with than low velocity work than low velocity rotation.
The utility model further improves and is, described motor comprises two dc sources, when switching device makes that described power supply series connection and the described shared carbon brush of conducting are used carbon brush with high speed, described tool heads is worked at a relatively high speed, when switching device made that carbon brush is used in described power supply parallel connection and the described shared carbon brush of conducting and low speed, described tool heads was with than low velocity work.
The utility model further improves and is, described switching device comprises three single-pole double-throw switch (SPDT)s, each switch comprises two contacts and a contact, a wherein contact of first switch and the positive pole of a power supply join, the stiff end of contact and the positive pole of another power supply join, a wherein contact of one contact of second switch and described first switch joins, another contact links to each other with the negative pole of a described power supply and the tie-point of shared carbon brush, the stiff end of contact and the negative pole of described another power supply join, two contacts of the 3rd switch join with carbon brush with carbon brush and high speed with low speed respectively, and the stiff end of contact and the positive pole of described another power supply join.
The utility model further improves and is, described motor comprises two power supplys, when switching device make the series connection of described power supply and with described shared carbon brush with at a high speed with the carbon brush conducting time, described motor output shaft rotates at a relatively high speed, when switching device makes described shared carbon brush and low speed with carbon brush during with a power turn-on wherein, described motor output shaft is to rotate than low velocity.
The utility model further improves and is, described motor comprises big magnitude of voltage power supply and small voltage value power supply, the described switching device optionally described shared carbon brush of conducting, big magnitude of voltage power supply and high speed is used carbon brush, or the described shared carbon brush of conducting, small voltage value power supply and low speed carbon brush.
The utility model further improves and is, described motor comprises a direct current power supply, described switching device comprises a single-pole double-throw switch (SPDT), low speed joins with the contact of carbon brush by resistance and single-pole double-throw switch (SPDT), directly be connected with another contact of switch with carbon brush at a high speed, the stiff end of the contact of described single-pole double-throw switch (SPDT) links to each other with an end of described dc source, and the other end of described dc source and shared carbon brush join.
The utility model further improves and is, described motor comprises a direct current power supply, described switching device comprises a single-pole double-throw switch (SPDT), low speed joins with the contact of carbon brush by higher value resistance and single-pole double-throw switch (SPDT), join with carbon brush another contact at a high speed by smaller value resistance and switch, the stiff end of the contact of described single-pole double-throw switch (SPDT) links to each other with an end of described dc source, and the other end of described dc source and shared carbon brush join.
The beneficial effect that the utility model illustrated embodiment has is: select different carbon brush combinations to obtain different motor output speeds with different power supply combination or resistance settings by switching device, thereby connect the progression of gear-box after can reducing, connect gear-box after the simplification.
In order further to understand feature of the present utility model and technology contents, see also following about detailed description of the present utility model and accompanying drawing, yet institute's accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the utility model is limited.
Description of drawings
In the accompanying drawing:
Fig. 1 is the perspective view of an embodiment electric tool of the utility model;
Fig. 2 is the connection diagram of commutator, carbon brush, power supply, switching device of motor in the electric tool shown in Figure 1 etc.;
Fig. 3 is the connection diagram of commutator, carbon brush, power supply, switching device of the motor of another embodiment of the utility model etc.;
Fig. 4 is the connection diagram of commutator, carbon brush, power supply, switching device of the motor of the another embodiment of the utility model etc.;
Fig. 5 is the utility model connection diagram of the commutator, carbon brush, power supply, switching device etc. of the motor of an embodiment again;
Fig. 6 is the utility model connection diagram of the commutator of the motor of an embodiment, carbon brush, power supply, switching device etc. more again.
The specific embodiment
Below in conjunction with accompanying drawing,, will make the technical solution of the utility model and other beneficial effects apparent by the specific embodiment of the present utility model is described in detail.
Below in conjunction with Fig. 1 to Fig. 3 embodiment of the present utility model is set forth.Be appreciated that ground, electric tool of the present utility model can be electric drill, electric hammer, electric saw, electric planer, electric wrench or the like.Being simplified illustration, is that example describes below with the electric drill.
See also Fig. 1, described electric drill comprises housing 10, is installed in motor 30, the reducing gear 50 that links to each other with motor output revolving shaft 32 in the housing 10, the drill bit 70 that driven by reducing gear.
See also Fig. 2, described motor 30 is a d.c. motor, comprises the commutator C that is installed on the motor output shaft 32, shared carbon brush B1, low speed carbon brush B2, high speed carbon brush B3, at least one dc source, reaches the switching device that connects described carbon brush and power supply.In the present embodiment, described motor comprises two dc source U1, U2, and described commutator C comprises the commutator segment of several spaces, is connected with winding (not indicating) between adjacent commutator segment.
In the present embodiment, described switching device comprises three single-pole double-throw switch (SPDT) K1, K2, K3, each switch comprises two contacts and a contact, wherein first contact S11 of first K switch 1 and the positive pole of the first power supply U1 join, the positive pole of the stiff end of contact and second source U2 joins, and the free end of contact is used for optionally connecting terminal S11 or contact S12; The second contact S22 of second switch K2 and the first contact S11 of described first switch join, and the first contact S21 links to each other with the negative pole of the first power supply U1 and the tie-point of shared carbon brush B1, and the negative pole of the stiff end of contact and second source U2 joins; Two contact S31, the S32 of the 3rd K switch 3 joins with carbon brush B3 with carbon brush B2 and high speed with low speed respectively, and the positive pole of the stiff end of contact and described second source U2 joins.The contact of described three K switch 1, K2, K3 connects together by connecting rod (among the figure shown in the dotted line), promptly by promoting connecting rod, can change the free-ended selection mode of contact of three switches.
When by promote connecting rod make the contact free end of described three K switch 1, K2, K3 and the first contact S11, S21, when S31 joins, described power supply U1, U2 parallel connection, described shared carbon brush B1 and low speed with carbon brush B2 by commutator and winding and power supply U1, U2 conducting, described motor output shaft 32 will rotate than low velocity thereby drive electric drill head 70 with than the low velocity rotation; When making the contact free end of described three K switch 1, K2, K3 with the second contact S12, S22, described power supply U1, U2 connected when S32 joined by promoting connecting rod, described shared carbon brush B1 is connected with carbon brush B3 with high speed, described motor output shaft 32 will rotate at a relatively high speed, thereby drive the rotation of electric drill head 70 fair speeds.
In the above-described embodiments, can select different carbon brush and the combination of corresponding power supply by switching device, and obtain different motor output speeds, like this, connect the progression of gear-box after can reducing, thereby reduce the loss on gear-box.And, when needs motor output low speed, the effective time of power supply U1, U2 use in parallel can increasing motor, improve its life-span.
See also Fig. 3, be appreciated that ground, described switching device can be a linked switch K, described two power supply U1, U2 parallel connection, positive pole is connected to shared carbon brush B1, negative pole links to each other with carbon brush B3 with high speed with carbon brush B2 with low speed respectively by linked switch K, and the magnitude of voltage of power supply U1 is greater than the magnitude of voltage of power supply U2 in the present embodiment.Described linked switch K optionally turn-on power U1 uses carbon brush B3 with high speed, so that the rotation of described motor output shaft 32 fair speeds, thereby drive the rotation of electric drill head 70 fair speeds; Or turn-on power U2 and low speed carbon brush B2, so that described motor output shaft 32 than the low velocity rotation, rotates than low velocity thereby drive electric drill head 70.
See also Fig. 4, be appreciated that ground, described switching device can also be a single-pole double-throw switch (SPDT) K, be connected in two power supply U1, U2 and low speed with between the carbon brush B2, when the contact of described K switch is connected to the first contact S1, power supply U1 and low speed will rotate than low velocity thereby drive electric drill head 70 with than the low velocity rotation with carbon brush B2 conducting, motor output shaft; When the contact of described K switch was connected to the second contact S2, power supply U1 was connected with carbon brush B3 with power supply U2 series connection and with high speed, and motor output shaft will rotate at a relatively high speed, thereby drove the rotation of electric drill head 70 fair speeds.
See also Fig. 5, be appreciated that ground, described motor also can only use a power supply U, the resistance R of connecting between the first contact S1 of low speed with carbon brush B2 and single-pole double-throw switch (SPDT) K, and the second contact S2 of K switch directly is connected with carbon brush B2 with high speed.Like this, when the shared carbon brush B1 of switching device K conducting and low speed during with carbon brush B2, the electric current by carbon brush B2 passes through the electric current of carbon brush B3 less than as the shared carbon brush B1 of switching device conducting with at a high speed with carbon brush B3 the time, thereby makes the exportable two kinds of different speed of motor.Be appreciated that ground, also can use the resistance R 1 and the R2 of two kinds of different resistances to connect with carbon brush B3 with carbon brush B2 and high speed with low speed respectively, as shown in Figure 6, the resistance of resistance R 1 is greater than the resistance of resistance R 2, when switching device when optionally the shared carbon brush B1 of conducting and low speed are with carbon brush B2 or shared carbon brush B1 with at a high speed with carbon brush B3, the exportable two kinds of different speed of described motor.
Be appreciated that ground, foregoing description is of the present utility model giving an example, should not be construed as restriction the utility model, be not restricted to two or one as power supply, can also be three, four etc., carbon brush can also be four, five or the like, by different carbon brush combinations and different power supply combination or different resistance settings, can make motor export various speed, thereby connect the progression of gear-box after can reducing, connect gear-box after the simplification, thereby reduce cost.
The above; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to the technical solution of the utility model and technical conceive, and all these changes and distortion all should belong to the protection domain of claim of the present utility model.
Claims (7)
1. electric tool, comprise housing, be installed in motor, the reducing gear that links to each other with motor output shaft in the housing, the tool heads that driven by reducing gear, it is characterized in that: described motor is a d.c. motor, comprise the commutator that is installed on the motor output shaft, shared carbon brush, high speed carbon brush, low speed carbon brush, at least one dc source, reach the switching device that connects described carbon brush and power supply, described switching device optionally makes described power supply, shared carbon brush and high speed be communicated with carbon brush, or makes described power supply, shared carbon brush be communicated with carbon brush with low speed.
2. electric tool as claimed in claim 1, it is characterized in that: described motor comprises two dc sources, described switching device optionally make described two dc sources series connection and with described shared carbon brush with use the carbon brush conducting at a high speed, or make described two dc sources parallel connection and with described shared carbon brush and low speed carbon brush conducting.
3. electric tool as claimed in claim 2, it is characterized in that: described switching device comprises three single-pole double-throw switch (SPDT)s, each switch comprises two contacts and a contact, a wherein contact of first switch and the positive pole of a power supply join, the stiff end of contact and the positive pole of another power supply join, a wherein contact of one contact of second switch and described first switch joins, another contact links to each other with the negative pole of a described power supply and the tie-point of shared carbon brush, the stiff end of contact and the negative pole of described another power supply join, two contacts of the 3rd switch join with carbon brush with carbon brush and high speed with low speed respectively, and the stiff end of contact and the positive pole of described another power supply join.
4. electric tool as claimed in claim 1, it is characterized in that: described motor comprises two power supplys, described switching device optionally make described two power supplys series connection and with described shared carbon brush with use the carbon brush conducting at a high speed, or make described shared carbon brush and low speed with carbon brush and a power turn-on wherein.
5. electric tool as claimed in claim 1, it is characterized in that: described motor comprises big magnitude of voltage power supply and small voltage value power supply, described switching device optionally makes described shared carbon brush, big magnitude of voltage power supply and use the carbon brush conducting at a high speed, or makes described shared carbon brush, small voltage value power supply and low speed carbon brush conducting.
6. electric tool as claimed in claim 1, it is characterized in that: described motor comprises a direct current power supply, described switching device comprises a single-pole double-throw switch (SPDT), low speed joins with the contact of carbon brush by resistance and single-pole double-throw switch (SPDT), directly be connected with another contact of switch with carbon brush at a high speed, the stiff end of the contact of described single-pole double-throw switch (SPDT) links to each other with an end of described dc source, and the other end of described dc source and shared carbon brush join.
7. electric tool as claimed in claim 1, it is characterized in that: described motor comprises a direct current power supply, described switching device comprises a single-pole double-throw switch (SPDT), low speed joins with the contact of carbon brush by higher value resistance and single-pole double-throw switch (SPDT), join with carbon brush another contact at a high speed by smaller value resistance and switch, the stiff end of the contact of described single-pole double-throw switch (SPDT) links to each other with an end of described dc source, and the other end of described dc source and shared carbon brush join.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201339489U CN201558979U (en) | 2009-07-23 | 2009-07-23 | Electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201339489U CN201558979U (en) | 2009-07-23 | 2009-07-23 | Electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201558979U true CN201558979U (en) | 2010-08-25 |
Family
ID=42624126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201339489U Expired - Lifetime CN201558979U (en) | 2009-07-23 | 2009-07-23 | Electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201558979U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447356A (en) * | 2010-10-01 | 2012-05-09 | 盖茨股份有限公司 | Brush holder for an electric motor |
| CN104511884A (en) * | 2013-10-04 | 2015-04-15 | 筌诚机械股份有限公司 | Oil pressure pulse type electric tool with speed cut-off function |
-
2009
- 2009-07-23 CN CN2009201339489U patent/CN201558979U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447356A (en) * | 2010-10-01 | 2012-05-09 | 盖茨股份有限公司 | Brush holder for an electric motor |
| CN102447356B (en) * | 2010-10-01 | 2016-06-29 | 盖茨股份有限公司 | The carbon brush configuration of motor |
| CN104511884A (en) * | 2013-10-04 | 2015-04-15 | 筌诚机械股份有限公司 | Oil pressure pulse type electric tool with speed cut-off function |
| CN104511884B (en) * | 2013-10-04 | 2017-04-12 | 筌诚机械股份有限公司 | Oil pressure pulse type electric tool with speed cut-off function and speed cut-off method |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100825 |