CN110401306A - Electric working machine - Google Patents
Electric working machine Download PDFInfo
- Publication number
- CN110401306A CN110401306A CN201910217361.4A CN201910217361A CN110401306A CN 110401306 A CN110401306 A CN 110401306A CN 201910217361 A CN201910217361 A CN 201910217361A CN 110401306 A CN110401306 A CN 110401306A
- Authority
- CN
- China
- Prior art keywords
- mentioned
- brush
- wiring
- pair
- working machine
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
- B23D45/16—Hand-held sawing devices with circular saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
- B23D47/12—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of drives for circular saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/02—Construction of casings, bodies or handles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B9/00—Portable power-driven circular saws for manual operation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
- H02K11/026—Suppressors associated with brushes, brush holders or their supports
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/40—Structural association with grounding devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
- H02K7/145—Hand-held machine tool
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Portable Power Tools In General (AREA)
- Motor Or Generator Frames (AREA)
- Motor Or Generator Current Collectors (AREA)
- Harvester Elements (AREA)
Abstract
The present invention is provided in the electric working machine with motor, is able to suppress the increase of component count, and reduce motor electrical noise generation when to the electric working machine of the negative effects of the other electrical equipments being present in around electric working machine.One mode of the disclosure is that have motor, work department, a pair of wiring that is powered, grounding connection wiring and the electric working machine in grounded metal portion.Grounding connection wiring is electrically connected with the side in a pair of of brush portion.The wiring of grounded metal portion and grounding connection is electrically connected and bigger than brush portion volume.In the electric working machine, even if produce spark between commutator in motor and brush portion, electrical noise due to spark is also grounded metal portion absorption via grounding connection wiring, so can reduce the propagation of the electrical noise to the wiring that is powered, and it is able to suppress from being powered and is routed to external radiated noise.
Description
Technical field
This disclosure relates to have the electric working machine of motor.
Background technique
The motor used in electric working machine as power source has the case where generating electrical noise in motor driving.Specifically
For, the case where having in the driving of motor, generate spark in contact and disengaging of the brush with commutator and generate electrical noise.
If generating such electrical noise, has and generate the negative effect to the other electrical equipments being present in around electric working machine
Situation.
In this regard, proposing in order to which noise reduces (lower noise) and has the electric working machine (patent of noise reducing circuit
Document 1).Noise reducing circuit for example has the choke coil for being separately connected a pair of input terminals and motor terminal and is separately connected one
To the capacitor of input terminal and ground terminal as noise dampening element.
Patent document 1: Japanese Patent Publication 8-196 bulletin
But above-mentioned electric working machine needs to have noise reducing circuit when inhibiting in the electrical noise that motor generates,
So the component count of electric working machine increases.Due to the increase of such component count, the overall cost as electric working machine increases
Greatly.
Summary of the invention
Therefore, it in the one side of the disclosure, is intended to provide in the electric working machine with motor, is able to suppress component count
Increase, and negative shadow to the other electrical equipments being present in around electric working machine when the electrical noise for reducing motor generates
Loud electric working machine.
One mode of the disclosure is that have motor, work department, a pair of wiring that is powered, grounding connection wiring and ground connection gold
The electric working machine in category portion.
Motor has the rotor by being rotated from the supply of external driving electric power.Work department transmits rotor
Rotary force and work.A pair, which is powered to being routed to motor, supplies above-mentioned driving electric power.
Motor has commutator, a pair of of brush portion and stator.
Commutator is rotated together with rotor.A pair of of brush portion is powered to being routed with a pair and be electrically connected.In addition, a pair of of brush
Portion with rotor rotation repeat with commutator be electrically connected and disengaging.Stator has configuration in the yoke in the outside of rotor
(magnetic yoke).
Grounding connection wiring is electrically connected with the side in a pair of of brush portion.Grounded metal portion is electrically connected with grounding connection wiring
It connects.Grounded metal portion is bigger than brush portion volume.
In the electric working machine, the side in a pair of of brush portion is routed via grounding connection to be connect with grounded metal portion,
So even if in the case where producing spark between commutator in motor and brush portion, due to spark electrical noise also via
Grounding connection wiring is grounded metal portion absorption.In other words, even if the electric working machine produces between commutator and brush portion
In the case where having given birth to spark, also can reduce to be powered wiring electrical noise propagation, and be able to suppress from be powered wiring to
External radiation noise.
As a result, according to the electric working machine, it is able to suppress the increase of the component counts such as capacitor, and reduction is made an uproar in the electricity of motor
Negative effect when sound generates to the other electrical equipments being present in around electric working machine.
In above-mentioned electric working machine, metal portion can be the yoke of stator.The yoke of stator is compared with brush portion
The biggish component of volume, so the electrical noise due to spark can fully be absorbed.
In addition, work department can consist of metal in above-mentioned electric working machine, metal portion is work department.Work department
It is the biggish component of volume compared with brush portion, so the electrical noise due to spark can fully be absorbed.
Next, brush portion can have brush main part and brush maintaining part in above-mentioned electric working machine, ground connection
Connecting wiring is connect at least one party in brush main part and brush maintaining part.
Brush main part is the component being electrically connected with commutator, and is the component at least constituted using conductive carbon material.
Brush maintaining part is the component that brush main part is kept with the state that can slide, and is at least to use conductive metal material structure
At component.
Even if the brush portion of such composition is in the case where the distance change with commutator, since brush main part carries out
Sliding, so being also able to maintain that the connection status with commutator.In addition, due to grounding connection wiring and brush main part and electricity
At least one party's connection in brush maintaining part is electrically connected so grounding connection wiring can be established with brush portion, and can be true
Vertical brush portion is electrically connected with grounded metal portion.
As a result, according to the electric working machine, even if in the case where the distance change of brush portion and commutator, it also can be true
Vertical brush portion is electrically connected with grounded metal portion, thus can reduce the electrical noise due to motor to other electrical equipments
Negative effect.
In addition, brush main part can be the component using conductive carbon material and conductive metal material composition.
Secondly, in the above-mentioned electric working machine that brush portion has brush main part and brush maintaining part, grounding connection
Wiring can be connect with brush main part.
In addition, in the above-mentioned electric working machine that brush portion has brush main part and brush maintaining part, grounding connection
Wiring can be connect with brush maintaining part.
Secondly, a pair, which is powered, to be routed and can be directly connected to a pair of of brush portion, and ground connection connects in above-mentioned electric working machine
The energization for meeting the side that wiring can be powered in wiring with a pair be routed in same position and connect with brush portion.
In this way, it is routed in the composition that same position is connect with brush portion with energization by using grounding connection wiring, it can
Implement the connection operation of the connection operation of grounding connection wiring and brush portion and be powered wiring and brush portion using primary operation.
For example, using realization connection operation is brazed, intensively by the end of the end for the wiring that is powered and grounding connection wiring
Portion is soldered to brush portion.
As a result, according to the electric working machine, since connection operation when manufacture can be simplified, so can reduce system
Cause this.
Secondly, a pair, which is powered, to be routed and can be directly connected to a pair of of brush portion, and ground connection connects in above-mentioned electric working machine
Connecing wiring can connect in the position different from the connecting portion of a pair of of energization wiring and a pair of of brush portion with brush portion.
In this way, by making the connecting portion being routed with grounding connection in brush portion and the connection with the wiring that is powered in brush portion
Position is different position, determines that the freedom degree when layout path of grounding connection wiring improves.Thereby, it is possible to inhibit ground connection to connect
The interference of wiring and the wiring that is powered is connect, and the reliably wiring of connection grounding connection and brush portion.
As a result, according to the electric working machine, grounding connection wiring and brush portion can be reliably connected, and can be established
Brush portion is electrically connected with grounded metal portion, so the electrical noise that can reduce due to motor bears other electrical equipments
Face is rung.
In addition, in the case where brush portion has brush main part and brush maintaining part, connection brush main part can be with
Brush maintaining part is routed and connect with grounding connection and is powered is routed.Alternatively, it is also possible to brush portion have brush main part with
And in the case where brush maintaining part, it is configured to grounding connection wiring and the wiring that is powered is connect with brush maintaining part, and constitute
What it is for brush maintaining part is not with the connecting portion of grounding connection wiring and the connecting portion of brush maintaining part being routed with energization
Same position.Also, it can also be configured to ground connection in the case where brush portion has brush main part and brush maintaining part and connect
It connects wiring and the wiring that is powered is connect with brush main part, and be configured to the connection with grounding connection wiring of brush main part
The connecting portion of position and brush main part being routed from energization is different position.
Detailed description of the invention
Fig. 1 is the perspective view for indicating the appearance of circular saw of first embodiment.
Fig. 2 is the cross-sectional view for showing schematically the Inner Constitution of circular saw of first embodiment.
Fig. 3 is the exploded perspective view for having the brush of brush main part and brush maintaining part.
Fig. 4 is to indicate to have accommodated in the main body cover of motor, the explanatory diagram with the state of the side of saw blade shell connection.
Fig. 5 is the explanatory diagram being electrically connected to form for indicating motor and control device in first embodiment.
Fig. 6 is the explanatory diagram being electrically connected to form for indicating motor and control device in comparative example.
Fig. 7 is the measurement result of the noise in first embodiment.
Fig. 8 is the measurement result of the noise in comparative example.
Fig. 9 is the explanatory diagram being electrically connected to form for indicating motor and control device in other embodiment.
Figure 10 is grounding connection wiring and the wiring that is powered be welded in brush maintaining part composition brush decomposition it is vertical
Body figure.
Figure 11 is the connection of the connecting portion and brush main part and the wiring that is powered of brush main part and grounding connection wiring
Position becomes the exploded perspective view of the brush of the composition of different location.
Figure 12 is the cross-sectional view for showing schematically the Inner Constitution of circular saw of other embodiment.
Specific embodiment
Hereinafter, being illustrated using attached drawing to using embodiment of the present disclosure.
In addition, the disclosure is not limited to the following embodiments and the accompanying drawings, certainly can as long as belonging to scope of the presently disclosed technology
It enough adopts in various manners.
[1. first embodiment]
[1-1. overall structure]
As first embodiment, the annular saw of one of electric working machine used in the purposes as cutting object is enumerated
1 is illustrated (hereinafter also referred to as circular saw 1).
As shown in Figure 1 and Figure 2, circular saw 1 has main body cover 10 and saw blade shell 20.
As shown in Fig. 2, main body cover 10 stores the motor 2 as drive force source.Saw blade shell 20 is formed as covering saw blade
16 a part.Saw blade shell 20 stores the gear mechanism 12 that the rotation of motor 2 is transmitted to saw blade 16.
Main body cover 10 has the handle portion 8 held for user.Handle portion 8 is formed as to the rotation with motor 2
The orthogonal direction of shaft 4 is prominent.
The rotary shaft 4 of motor 2 is by being arranged the bearing 41 of shell 10 and the bearing being arranged in saw blade shell 20 outside the main body
43 are fixed in a manner of it can rotate.In addition, the rotary shaft in motor 2 is provided with the wind that rotation generates cooling wind
Fan 6.
Has the output shaft 14 of the saw blade 16 for fixed disc shape in the inside of saw blade shell 20.Output shaft 14 is in saw blade
The inside of shell 20 is supported in a manner of it can rotate via bearing 24 and bearing part 24a.
Using bolt 18, hold assembly 19A, 19B, saw blade 16 is fixed on to the end of output shaft 14.Hold assembly 19A,
19B is formed as the ring-type for having through hole in center.Hold assembly 19A, 19B are configured as clamping saw blade 16.Bolt 18
Be inserted into hold assembly 19A, saw blade 16, the respective center hold assembly 19B through hole, and with output shaft 14 is set
The screwhole spiro bonding of end.Output shaft 14 has flange part 36 in the position of fixed saw blade 16.In other words, saw blade 16 and clamping part
Part 19A, 19B are clamped in together between bolt 18 and flange part 36, to be fixed on the end of output shaft 14.
Bearing part 24a supports output shaft 14 via bearing 24 in a manner of it can rotate.Bearing part 24a is with output shaft
The 14 central axis mode parallel with the central axis of rotary shaft 4 of motor 2, is fixed on saw blade shell 20.
In the inside of saw blade shell 20, the rotary shaft 4 of output shaft 14 and motor 2 connects via the gear mechanism 12 of deceleration
Knot.By the connection, it is configured to output shaft 14 via gear mechanism 12 and driving is rotated by motor 2, so that saw blade 16 be made to rotate.
Saw blade shell 20 is formed as covering the substantially half of the periphery for the saw blade 16 for being fixed on output shaft 14.In saw blade shell
20 are linked with the cover 26 of a part for the part not covered by saw blade shell 20 in the periphery for covering saw blade 16.Cover 26 is with energy
Enough states that will be rotated centered on output shaft 14, are fixed on saw blade shell 20.Saw blade shell 20 and cover 26 are configured to
Cover the substantially the entire area of the periphery of saw blade 16.
Cover 26 usually by the active force of press member (diagram is omitted), is maintained at the substantially whole of the periphery of covering saw blade 16
The protective position in a region.In circular saw 1 in use, rotating cover 26 by the active force for resisting press member, exposing is sawed
A part of the periphery of piece 16.User by making cover 26 rotate the shape for exposing a part of the periphery of saw blade 16 like this
Under state, keeps circular saw 1 mobile to cutting direction of travel (referring to Fig.1) and support the saw blade of rotation status 16 with machined material
It connects, machined material can be cut off.In addition, cover 26 can be moved to from above-mentioned protective position centered on output shaft 14 and be kept out of the way
Position.The retreating position of cover 26 is the position that the region not covered by saw blade shell 20 in the periphery for instigate saw blade 16 is exposed.
[1-2. motor]
Next, being illustrated to motor 2.
Motor 2 is to be configured to switch in the electric current that armature flows through according to rotatable phase, and turning moment is remained constant side
To commutator motor (so-called brush motor).
As shown in Fig. 2, motor 2 has rotor 9, mechanical rectification 11 (hereinafter, being also only called commutator 11), a pair of of brush
13 and stator 17.
Rotor 9 is integrally formed with rotary shaft 4 and commutator 11, and has the winding being electrically connected with commutator 11
(diagram is omitted).In the motor 2 of present embodiment, has rotor 9 as armature.
Has commutator 11 in the end of rotor 9, which rotates together with rotor 9.If commutator 11 be configured to
A pair of of brush 13 is electrically connected the energization for then carrying out the winding to rotor 9, stops if being detached from a pair of of 13 electricity of brush to rotor 9
The energization of winding.In addition, commutator 11 can use well known composition, so omitting the explanation constituted in detail.
A pair of of brush 13 by the brush 13 of the circumferential direction centered on commutator 11, a side to configure in the electricity with another party
The mode for brushing 13 different circumferential positions is fixed on the inside of main body cover 10.Although in addition, only illustrating an electricity in Fig. 2
Brush 13, but motor 2 has other brushes 13 (not shown).
Commutator 11 and a pair of of brush 13 according to the rotation position of rotor 9, exist the link position being electrically connected to each other and
The disengaging configuration not being electrically connected to each other.Therefore, a pair of of brush 13 repeats to be electrically connected with commutator 11 with the rotation of rotor 9
State and electric disengaged position with commutator 11.
As shown in figure 3, brush 13 has brush main part 13a and brush maintaining part 13b.Brush main part 13a and electricity
Brush maintaining part 13b is constituted using conductive material.The conductive material of brush main part 13a by conductive carbon material and is led
Conductive metallic material (for example, brass etc.) is constituted.In addition, by using conductive carbon material as principal component, and include electric conductivity
Metal material constitutes the conductive material.It is wrapped in each ingredient for constituting conductive material in addition, " principal component " here refers to
Containing most ingredients.In addition, the conductive material of brush maintaining part 13b is made of conductive metal material (for example, brass etc.).
Brush main part 13a has abutting part 13a1, linking part 13a2 and elastic portion 13a3.Abutting part 13a1 is configured to
The shape for being similar to polygon prism for having the curved surface 13a1a for abutting with commutator 11.Linking part 13a2 be configured to
The end of brush maintaining part 13b connects.Elastic portion 13a3 is so-called helical spring, and abutting part 13a1 is fixed in one end, another
Linking part 13a2 is fixed at end.
Brush maintaining part 13b is formed as the tubular of both ends open.The section shape of the opening portion of brush maintaining part 13b is formed
For the shape for being inserted into abutting part 13a1.Brush maintaining part 13b is configured to the open end from a side to another party's
Open end is inserted into (movement) abutting part 13a1 in the inside of brush maintaining part 13b.In other words, brush maintaining part 13b be with
The state that can be slided keeps the component of brush main part 13a (in particular, abutting part 13a1).
Brush main part 13a is configured in the state that abutting part 13a1 is inserted into the inside of brush maintaining part 13b, connection
Portion 13a2 can be connect with the end of brush maintaining part 13b.At this point, abutting part 13a1 is in the inside of brush maintaining part 13b, with energy
The state of enough slidings (can move) is configured.
Brush maintaining part 13b is in the state that the center portion of tubular is surrounded by insulating element 25, with insulating element 25 1
Constitute to body.Insulating element 25 is made of insulating material (for example, resin etc.).Brush maintaining part 13b is via insulating element 25
It is fixed on the inside of main body cover 10.
Brush 13 is by the state of being integrally provided with brush main part 13a and brush maintaining part 13b, via exhausted
Edge part 25 is fixed on the inside of main body cover 10, becomes the state that abutting part 13a1 is abutted with commutator 11.At this point, abutting part
13a1 is pressed into commutator 11 by the elastic force of elastic portion 13a3.In other words, brush main part 13a is (in particular, abut
Portion 13a1) it is the component being electrically connected with commutator 11.
Back to Fig. 2, stator 17 has yoke 17a (hereinafter also referred to as magnetic yoke 17a) and a pair of of permanent magnet 17b.
Yoke 17a is formed as cylindric and configures in the outside of rotor 9.Yoke 17a is by metal material (for example, iron, silicon steel
Plate etc.) it is formed.A pair of of permanent magnet 17b is fixed on the inner face of yoke 17a in a manner of configuring in the position for clamping rotor 9.In this way
One, yoke 17a and a pair of permanent magnet 17b configuration are in the outside of rotor 9.
Here, the state for having accommodated the side linked in the main body cover 10 of motor 2 with saw blade shell 20 is as shown in Figure 4.
As shown in figure 4, stator 17 (specifically, being yoke 17a) is fixed on main body cover by two fixing screws 33
10.In Fig. 4, the configuring area of stator 17 is indicated with oblique line decorative pattern.
As shown in Fig. 2, fixing screws 33 have screw head 33a and screw axle portion 33b.Fixing screws 33 are in screw axle portion
On the basis of 33b inserts annular shim 35, main body cover 10 is fixed on by screwing togather.At this point, yoke 17a is via annular shim
35 are clamped between screw head 33a and main body cover 10, so that stator 17 is fixed on main body cover 10.
In addition, in the sectional view in fig. 2, it is shown partially shown in region A1 and region A2 in main body cover 10 to be equivalent to
The Inner Constitution of the part of profile position shown in line segment P0-P1 in Fig. 4.In addition, in the sectional view in fig. 2, main body cover
The part of profile position shown in the line segment P0-P2 shown partially being equivalent in Fig. 4 shown in region A1 and region A3 in 10
Inner Constitution.
A brush 13 is electrically connected with grounding connection wiring 21 in a pair of of brush 13.Specifically, 13 center brush master of brush
Body portion 13a is connect with the end of grounding connection wiring 21.It is able to use and conductive material flexible is covered with insulating properties clad
The conducting wire of composition etc. constitute grounding connection wiring 21.As the connection method of brush 13 and grounding connection wiring 21, can make
With the methods of soldering or welding.In addition, in the present embodiment, as shown in figure 3, the end of grounding connection wiring 21 is soldered
Abutting part 13a1 in brush main part 13a.
The other end of grounding connection wiring 21 is connect with annular shim 35, and is electrically connected with the yoke 17a of stator 17.By
This, brush 13 is electrically connected via grounding connection wiring 21 and annular shim 35 with stator 17.
[1-3. electricity composition]
It is illustrated next, being constituted to the electricity centered on the electrical path to motor 2 in circular saw 1.
Circular saw 1 has control to the control device 52 of the energized state of motor 2.
As shown in figure 5, control device 52 has positive output terminals 52a and negative output terminals 52b.Control device 52
It is connect via two energization wirings 23 with motor 2.Specifically, the brush 13 of a side in a pair of of brush 13 that motor 2 has
23 connect with positive output terminals 52a via the energization wiring of a side, and in a pair of brush 13 another party brush 13 via
The energization wiring 23 of another party is connect with negative output terminals 52b.
In addition, circular saw 1 have Operation switch 37 (trigger switch 37) (referring to Fig.1), battery pack 39 (referring to Fig.1) and
Voltage conversion circuit (diagram is omitted).Voltage conversion circuit turns the voltage value of the DC voltage supplied via battery pack 39
It changes, generates the DC voltage of motor driving.Control device 52 detects user to the operating quantity of Operation switch 37, and by with
The corresponding DC voltage of operating quantity carries out the energization to motor 2.So, control device 52 is routed 23 pairs of motors via being powered
2 are powered, so that motor 2 is rotated according to the operating quantity of user.
Here, as shown in figure 5, a pair of of brush 13 is electrically connected with a pair of energization wiring 23.In addition, one in a pair of of brush 13
Brush 13 is connect via grounding connection wiring 21 with stator 17 (yoke 17a).
Therefore, even if produce spark between commutator 11 and brush 13, due to the electrical noise of spark
Also it is absorbed via grounding connection wiring 21 by yoke 17a, is not transferred to energization wiring 23.In other words, even if circular saw 1 exists
In the case where producing spark between commutator 11 and brush 13, the propagation of the electrical noise to the wiring 23 that is powered also can reduce,
And it can reduce from being powered and be routed 23 to external noise radiation amount.
In addition, a pair of of brush 13 is directly connected to a pair of energization wiring 23.Specifically, the brush maintaining part of brush 13
13b is directly connected to the wiring 23 that is powered.As the connection method of brush 13 and the wiring 23 that is powered, it is able to use soldering or welding
The methods of.In the present embodiment, as shown in figure 3, the end for the wiring 23 that is powered is welded on the lateral surface of brush maintaining part 13b
Connecting portion 22.
Moreover, as shown in Fig. 3 and Fig. 5, grounding connection wiring 21 with a pair of be powered wiring 23 and a pair of brush 13
The different position of connecting portion 22 is connect with brush 13.In this way, by making the connection with grounding connection wiring 21 on brush 13
On position and brush 13 is different positions from the connecting portion for the wiring 23 that is powered, and determines the laying of grounding connection wiring 21
Freedom degree when path improves.
[1-4. measurement result]
Next, being illustrated to the measurement of the noise reduction in the circular saw 1 for confirming present embodiment.
In this measurement, it as comparative example, has used from the composition that is connect with ground wire of half-way for the wiring 23 that is powered
Electric working machine.As shown in fig. 6, the electric working machine of comparative example is switched on the half-way 23b of wiring 23 via comparing with connecing
The composition that ground connecting wiring 23c is connect with stator 17 (yoke 17a).
The noise being radiated outside in motor driving is determined to circular saw 1 and each of comparative example.About opposite
In the measurement result (noise waveform) for determining noise intensity of each frequency, the measurement result of circular saw 1 is as shown in fig. 7, compare
The measurement result of example is as shown in Figure 8.
According to measurement result, it is known that the peak value (14.9 [dB μ V/m]) and the noise in comparative example of the noise in circular saw 1
Peak value (21.0 [dB μ V/m]) compared to smaller.In other words, circular saw 1 can reduce and make an uproar to external compared with comparative example
Acoustic radiation amount can play noise reduction.
It in a comparative example, (is specifically, from the connection end with brush 13 in the specific part 23a in wiring 23 that is powered
The partway part of position 23b), due to the noise transmission of the spark between commutator 11 and brush 13, so from particular portion
23a is divided to discharge noise to outside.In contrast, circular saw 1 is due in the 23 not borne noise of wiring that is powered, thus can reduce to
External noise radiation amount.
[1-5. effect]
Embodiment from the description above can obtain effect below.
In the circular saw 1 of present embodiment, since the side in a pair of of brush 13 is via grounding connection wiring 21 and yoke
Iron 17a connection, so even if in the case where producing spark between commutator 11 and brush 13 in motor 2, due to spark
Electrical noise also 21 absorbed by yoke 17a via grounding connection wiring.In other words, even if circular saw 1 is in commutator 11 and electricity
In the case where producing spark between brush 13, the propagation of the electrical noise to the wiring 23 that is powered also can reduce, and be able to suppress
23 are routed to external radiated noise from being powered.
As a result, according to circular saw 1, it is able to suppress the increase of the component counts such as capacitor, and reduces the electrical noise production in motor 2
Negative effect when raw to the other electrical equipments being present in around circular saw 1.
In addition, the yoke 17a of stator 17 is the biggish component of volume compared with brush 13 in circular saw 1.Therefore, lead to
It crosses and is electrically connected brush 13 with yoke 17a, yoke 17a can fully be absorbed due to the fire between commutator 11 and brush 13
Colored electrical noise.
Even if next, brush 13 is in the case where the distance change with commutator 11, (in detail due to brush main part 13a
It is abutting part 13a1 for thin) in the internal slide of brush maintaining part 13b, so being also able to maintain that the connection with commutator 11
State.In addition, since grounding connection wiring 21 connect with brush maintaining part 13b, thus can establish grounding connection be routed 21 and
The electrical connection of brush 13, and being electrically connected for brush 13 and yoke 17a can be established.
As a result, according to circular saw 1, even if can also be established in the case where the distance change of brush 13 and commutator 11
Brush 13 is electrically connected with yoke 17a's, so can reduce bearing to other electrical equipments for the electrical noise due to motor 2
Face is rung.
Next, grounding connection wiring 21 is in the position different from a pair of of energization wiring 23 and a pair of of connecting portion of brush 13
It sets and is connect with brush 13.In this way, by making brush 13 and the connecting portion of grounding connection wiring 21 and brush 13 and energization
The connecting portion of wiring 23 is different position, and freedom degree when determining the laying path of grounding connection wiring 21 improves.As a result,
It is able to suppress the interference of grounding connection wiring 21 with the wiring 23 that is powered, and reliably connects grounding connection wiring 21 with brush 13
It connects.
As a result, according to circular saw 1, reliably grounding connection wiring 21 can be connect with brush 13, and can established
Brush 13 is electrically connected with yoke 17a's, so can reduce bearing to other electrical equipments for the electrical noise due to motor 2
Face is rung.
[corresponding relationship of 1-6. sentence]
Here, the corresponding relationship of the sentence in present embodiment is illustrated.
Circular saw 1 is equivalent to an example of electric working machine, and motor 2 is equivalent to an example of motor, saw blade 16, saw
Piece shell 20, gear mechanism 12, output shaft 14, bearing 24, bearing part 24a, bolt 18, hold assembly 19A, hold assembly
19B, cover 26 are equivalent to an example of work department.
The wiring 23 that is powered is equivalent to an example of the wiring that is powered, and mechanical rectification 11 is equivalent to an example of commutator
Son, a pair of of brush 13 are equivalent to an example in a pair of of brush portion, and brush main part 13a is equivalent to an example of brush main part
Son, brush maintaining part 13b are equivalent to an example of brush maintaining part, and stator 17 is equivalent to an example of stator.Ground connection connects
The example that wiring 21 is equivalent to grounding connection wiring is connect, yoke 17a is equivalent to an example in grounded metal portion.
[2. other embodiments]
More than, embodiment of the present disclosure is illustrated, but the disclosure is not limited to the above embodiment, not
It is detached from the range of the purport of the disclosure, can implement in various ways.
(1) in the above-described embodiment, to ground connection connecting wiring 21 and brush 13 connecting portion and be powered wiring 23 and
The connecting portion of brush 13 is differently composed to be illustrated, but the disclosure is not limited to such composition.For example, such as Fig. 9 institute
Show, it is same position that the connecting portion and energization for being also possible to grounding connection wiring and brush portion, which are routed with the connecting portion in brush portion,
The composition set.In other words, it is also possible to grounding connection wiring and is routed in same position with a pair of energization of a side in wiring that is powered
Set the composition connecting with brush portion.In this way, being routed in same position and company, brush portion by using grounding connection wiring and energization
The composition connect can implement the connection operation of grounding connection wiring and brush portion and be powered wiring and electricity using primary operation
The connection operation of brush portion.For example, using realization connection operation is brazed, it can be intensively by the end for the wiring that is powered
Brush portion is soldered to the end of grounding connection wiring.Electric working machine according to such composition as a result, when can make manufacture
Connection operation simplify, so can reduce manufacturing cost.
In addition, as an example, as shown in Figure 10, can enumerate the end of grounding connection wiring 21 and energization cloth
The end of line 23 is all welded to the composition of the connecting portion 22 of 13 center brush maintaining part 13b of brush.
(2) in the above-described embodiment, the composition 13 center brush main part 13a of brush being connect with grounding connection wiring 21
It is illustrated, but the disclosure is not limited to such composition.For example, as shown in Figure 10, being also possible to 13 center brush of brush
The composition that maintaining part 13b is connect with grounding connection wiring 21.
In addition, the composition that brush main part 13a is connect with grounding connection wiring 21 is not limited to the above embodiment that
The composition that abutting part 13a1 in the brush main part 13a of sample is connect with grounding connection wiring 21 is also possible to as shown in figure 11
The composition that linking part 13a2 in brush main part 13a is connect with grounding connection wiring 21.
In addition, in grounding connection wiring 21 and being powered in the composition that wiring 23 is connect with brush main part 13a, such as scheme
Shown in 11, it is also possible to connecting with the first of grounding connection wiring 21 for brush main part 13a (specifically, being linking part 13a2)
The second connecting portion position 22b for being routed 23 with energization of socket part position 22a and brush main part 13a is the composition of different location.In addition,
Although illustration omitted, in grounding connection wiring 21 and it is powered in the composition that wiring 23 is connect with brush maintaining part 13b,
It is can be brush maintaining part 13b with grounding connection wiring 21 connecting portion and brush maintaining part 13b with the wiring 23 that is powered
Connecting portion be different location composition.
(3) in the above-described embodiment, brush 13 is electrically connected via grounding connection wiring 21 with stator 17 (yoke 17a)
Composition be illustrated, but the disclosure is not limited to such composition.For example, as shown in figure 12, being also possible to brush 13
The composition being electrically connected via grounding connection wiring 21 with saw blade shell 20.In addition, in this case, saw blade shell 20 is by conductive gold
Belong to material (iron etc.) to constitute, and has a part of the saw blade shell as work department in electric working machine.Saw blade shell 20 is
The biggish component of volume compared with brush 13, so the electrical noise due to spark can fully be absorbed.In this case, saw blade
Shell 20 is equivalent to an example in grounded metal portion.
(4) electric working machine is not limited to circular saw as described above, for example, be also possible to electric hammer, electric hammer drill, electric drill,
Electric screwdriver, electric wrench, electric reciprocating saw, electronic scroll saw, electric slicer, electric chain saw, electronic plane, electronic rivet
It is mechanical, electrical dynamic nailing machine, electric mower, power-operated mower, electric lawn trimmer, motor-driven brush saw, electric cleaner, electronic
Air blower, grinder etc..
(5) function that a constituent element in above embodiment can also be made to have is separated into multiple constituent elements,
Or it is a constituent element that the function with multiple constituent elements, which is concentrated,.Alternatively, it is also possible to by the structure of above embodiment
At at least part be replaced into the well known composition of function having the same.Alternatively, it is also possible to omit above embodiment
A part of composition.Alternatively, it is also possible to which at least part of the composition of above embodiment not to be added to or be replaced into it
The composition of its above embodiment.In addition, the technical idea determined according only to sentence documented by claims is included
All modes be embodiment of the present disclosure.
Description of symbols
1 ... annular saw (circular saw), 2 ... motors, 4 ... rotary shafts, 9 ... rotors, 10 ... main body covers, 11 ... mechanical rectifications
(commutator), 13 ... brushes, 13a ... brush main part, 13a1 ... abutting part, 13a1a ... curved surface, 13a2 ... linking part,
13a3 ... elastic portion, 13b ... brush maintaining part, 16 ... saw blades, 17 ... stators, 17a ... yoke (magnetic yoke), 17b ... permanent magnet,
20 ... saw blade shells, the wiring of 21 ... grounding connections, 23 ..., which are powered, is routed, 26 ... covers, 33 ... fixing screws, 35 ... annular shims,
52 ... control devices.
Claims (8)
1. a kind of electric working machine, has:
Motor has the rotor by being rotated from the supply of external driving electric power；
Work department is passed the rotary force of above-mentioned rotor and works；And
A pair, which is powered, to be routed, they supply above-mentioned driving electric power to said motor,
Said motor has:
Commutator is rotated together with above-mentioned rotor；
A pair of of brush portion, they are a pair of of the brush portions being electrically connected with above-mentioned a pair of wiring that is powered, and with the rotation of above-mentioned rotor
Turn repetition and above-mentioned commutator be electrically connected and disengaging；And
Stator has the yoke configured in the outside of above-mentioned rotor,
Above-mentioned electric working machine has:
Grounding connection wiring is electrically connected with the side in above-mentioned a pair of of brush portion；And
Grounded metal portion is electrically connected and bigger than above-mentioned brush portion volume with the wiring of above-mentioned grounding connection.
2. electric working machine according to claim 1, wherein
Above-mentioned metal portion is the above-mentioned yoke of said stator.
3. electric working machine according to claim 1, wherein
Above-mentioned work department includes metal,
Above-mentioned metal portion is above-mentioned work department.
4. electric working machine according to any one of claims 1 to 3, wherein
Above-mentioned brush portion has brush main part and brush maintaining part,
Above-mentioned brush main part is the component being electrically connected with above-mentioned commutator, and is the portion at least constituted using conductive carbon material
Part,
Above-mentioned brush maintaining part is the component that above-mentioned brush main part is kept with the state that can be slided, and is at least using conduction
Property metal material constitute component,
Above-mentioned grounding connection wiring is connect at least one party in above-mentioned brush main part and above-mentioned brush maintaining part.
5. electric working machine according to claim 4, wherein
Above-mentioned grounding connection wiring is connect with above-mentioned brush main part.
6. electric working machine according to claim 4, wherein
Above-mentioned grounding connection wiring is connect with above-mentioned brush maintaining part.
7. electric working machine described according to claim 1~any one of 6, wherein
Above-mentioned a pair of wiring that is powered is directly connected to above-mentioned a pair of of brush portion,
Above-mentioned grounding connection wiring and an above-mentioned a pair of energization being powered in wiring are routed in same position and above-mentioned brush portion
Connection.
8. electric working machine described according to claim 1~any one of 6, wherein
Above-mentioned a pair of wiring that is powered is directly connected to above-mentioned a pair of of brush portion,
Above-mentioned grounding connection is routed in the position different from the connecting portion of above-mentioned a pair of of energization wiring and above-mentioned a pair of of brush portion
It is connect with above-mentioned brush portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018083234A JP7017461B2 (en) | 2018-04-24 | 2018-04-24 | Electric work machine |
| JP2018-083234 | 2018-04-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110401306A true CN110401306A (en) | 2019-11-01 |
| CN110401306B CN110401306B (en) | 2023-02-21 |
Family
ID=68105360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910217361.4A Active CN110401306B (en) | 2018-04-24 | 2019-03-21 | Electric working machine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7017461B2 (en) |
| CN (1) | CN110401306B (en) |
| DE (1) | DE102019109403A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112958743A (en) * | 2021-03-30 | 2021-06-15 | 杭州艾美依航空制造装备有限公司 | Pressure riveting driving device of driving multiplexing automatic drilling and riveting machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220336904A1 (en) * | 2021-04-19 | 2022-10-20 | Black & Decker Inc. | Nosecone to battery connection in power tool |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035626A (en) * | 2006-07-28 | 2008-02-14 | Mitsuba Corp | Electric motor with reduction gear |
| CN105474518A (en) * | 2013-09-06 | 2016-04-06 | 株式会社美姿把 | Electric motor |
| CN106026533A (en) * | 2015-03-26 | 2016-10-12 | 日本电产株式会社 | Motor and fan |
-
2018
- 2018-04-24 JP JP2018083234A patent/JP7017461B2/en active Active
-
2019
- 2019-03-21 CN CN201910217361.4A patent/CN110401306B/en active Active
- 2019-04-10 DE DE102019109403.8A patent/DE102019109403A1/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035626A (en) * | 2006-07-28 | 2008-02-14 | Mitsuba Corp | Electric motor with reduction gear |
| CN105474518A (en) * | 2013-09-06 | 2016-04-06 | 株式会社美姿把 | Electric motor |
| CN106026533A (en) * | 2015-03-26 | 2016-10-12 | 日本电产株式会社 | Motor and fan |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112958743A (en) * | 2021-03-30 | 2021-06-15 | 杭州艾美依航空制造装备有限公司 | Pressure riveting driving device of driving multiplexing automatic drilling and riveting machine |
| CN112958743B (en) * | 2021-03-30 | 2022-09-30 | 杭州艾美依航空制造装备有限公司 | Pressure riveting driving device for driving multiplexing automatic drilling and riveting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7017461B2 (en) | 2022-02-08 |
| DE102019109403A1 (en) | 2019-10-24 |
| CN110401306B (en) | 2023-02-21 |
| JP2019193415A (en) | 2019-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5170851A (en) | Electric tool | |
| US20150041167A1 (en) | Electric working machine | |
| US8508084B2 (en) | Power tool including hybrid electric motor design | |
| JP5387400B2 (en) | Electric mower | |
| CN110401306A (en) | Electric working machine | |
| US8823242B2 (en) | Disc motor and electric working machine equipped with disc motor | |
| JP7094667B2 (en) | Electric tool | |
| CN109995173A (en) | Brush carriage and motor for motor | |
| US2650993A (en) | Electric hair clipper | |
| JP2019004599A (en) | Electric tool | |
| JPH08223884A (en) | Manufacture of series coupled engine-driven welding machine and assembled structure thereof | |
| JP5751444B2 (en) | Disc motor and electric working machine | |
| JP2014027801A (en) | Motor with speed reducer and method of manufacturing motor with speed reducer | |
| US8791619B2 (en) | Disc motor and electric working machine equipped with disc motor | |
| CN110601488B (en) | Vibrating motor and electric toothbrush | |
| JP2012066474A (en) | Chain saw | |
| CN108923555B (en) | Direct-drive motor and household appliance | |
| US2221639A (en) | Power driving means | |
| JP5143577B2 (en) | Electric tool | |
| JP4714507B2 (en) | motor | |
| JP4731147B2 (en) | Electric tool | |
| JP2011097882A (en) | Electric bush cutter | |
| WO2021049124A1 (en) | Electric work machine | |
| JP2013017312A (en) | Disk motor and electric operating machine having the same | |
| JP4575072B2 (en) | Electric tool |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |