CN103904809A - Electric tool - Google Patents
Electric tool Download PDFInfo
- Publication number
- CN103904809A CN103904809A CN201310585300.6A CN201310585300A CN103904809A CN 103904809 A CN103904809 A CN 103904809A CN 201310585300 A CN201310585300 A CN 201310585300A CN 103904809 A CN103904809 A CN 103904809A
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- Prior art keywords
- bearing
- motor
- electric tool
- labyrinth sealing
- forms
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Abstract
The invention provides an electric tool, of which the bearing portion has sufficient dustproof and vibration resistance performance. The electric tool comprises a motor 31 as a drive source, a housing 11 receiving the motor 31, a motor shaft 32 of the motor 31, a bearing supporting the motor shaft 32, a labyrinth seal forming component 20 on the outer ring of the bearing, a bearing receiving hole 12b for receiving the bearing, and a dustproof shaft ring 40 which is adjacent to the labyrinth seal forming component 20 and cooperates with the labyrinth seal forming component 20 to form a labyrinth gap. The electric tool is characterized in that in an elastic assembly portion is formed on the periphery of the labyrinth seal forming component 20, the elastic assembly portion is equipped with elastic bodies, and the bearing with the labyrinth seal forming component 20 is received in the bearing receiving hole 12b.
Description
Technical field
The present invention relates to dust tight construction and the vibration absorbing structure of the bearing portion of a kind of electric tool axis supporting motor axle etc.
Background technology
All the time, using as drive source in the electric tool of motor, invade the bearing of axle supporting motor axle in order to prevent cutting the dust such as powder, give dust tight construction.For example, in the electric tool of recording in following patent documentation 1, the projection of the ring-type that the labyrinth sealing of the outer ring assembling by by bearing forms member (bearing cap), form in abutting connection with the dustproof axle collar (dust ring) arranging, around the peristome of the bearing reception hole (bearing patchhole) of motor field frame with bearing forms labyrinth gap, thereby prevents dust intrusion bearing.
In addition, in the record of following patent documentation 1, disclose and formed labyrinth sealing by rubber or resin and form member, in the time selecting rubber, form in the bearing reception hole of member because bearing is supported in across the labyrinth sealing of rubber system, therefore suppressed the transmission to motor field frame of the vibration of motor reel.
[formerly technical literature]
[patent documentation]
Patent documentation 1: Japanese kokai publication hei 8-182242 communique
[problem that invention will solve]
But, as mentioned above, when being made labyrinth sealing by rubber while forming member, because its form accuracy is low, be therefore difficult to labyrinth gap is set for and designed consistent size.And, allow to make and the consistent shape of design, in the time of assembling, the insertion resistance may be due to insertion bearing reception hole time etc. causes change of shape.In addition, the load may be due to the running of electric tool time, use all the year round cause its change of shape, thereby may cause labyrinth gap not maintain and design consistent size.For example, labyrinth gap vanishing, forming while coming in contact (sliding contact) between the member of labyrinth gap, produces abrasion powder, because this abrasion powder is invaded bearing inside and can cause the danger of bearing damage.
Summary of the invention
The present invention makes in view of above-mentioned problem, and its object is, the electric tool stably in bearing portion with sufficient dust tightness and vibrationproof is provided.
[for solving the means of problem]
Electric tool involved in the present invention possesses: as the motor of drive source; Receive the housing of described motor; The motor reel of described motor; Described motor reel is carried out to the bearing of axle supporting; The labyrinth sealing that is assemblied in the outer ring of described bearing forms member; The bearing reception hole that described bearing is supported; Form member with described labyrinth sealing and form that member cooperates and the dustproof axle collar that forms labyrinth gap in abutting connection with configuration and with described labyrinth sealing, described electric tool is characterised in that, described labyrinth sealing forms in member, be formed with elastomer department of assembly at its peripheral part, at described elastomer, department of assembly is equipped with elastomer, and the described bearing that is equipped with described labyrinth sealing formation member is bearing in described bearing reception hole via described elastomer.
In electric tool involved in the present invention, can take following mode, that is, the inner peripheral surface of described elastomeric outer surface and described bearing reception hole joins, and forms between the outer surface of member and the inner peripheral surface of described bearing reception hole and is formed with gap in described labyrinth sealing.
And, in electric tool involved in the present invention, can take following mode, that is, described elastomer department of assembly forms as circumferential slot.
In addition, in electric tool involved in the present invention, can take following mode, that is, described elastomer is formed as ring-type.
In addition, in electric tool involved in the present invention, can take following mode, that is, between the outer peripheral face of the described dustproof axle collar and the inner peripheral surface of described bearing reception hole, form labyrinth gap.
[invention effect]
According to the present invention, can provide the electric tool stably at bearing portion with sufficient dust tightness and vibrationproof.
Accompanying drawing explanation
Fig. 1 is the vertical view of the related electric tool of present embodiment.
Fig. 2 is the left side view of the related electric tool of present embodiment.
Fig. 3 is the figure of the section A-A of presentation graphs 2.
Fig. 4 is the major part enlarged drawing of Fig. 3.
Fig. 5 is the figure of another execution mode of explanation.
Embodiment
Below, utilize Fig. 1～Fig. 4 to illustrate for implementing the execution mode of the best of the present invention.In addition, in the following embodiments, exemplify the situation that the present invention is useful in to hand electric grinder and describe.And not to each claim, related invention limits following execution mode, and the combination of the feature illustrating in execution mode may not be all necessary in the solution of inventing.
Fig. 1 is the vertical view of the related electric tool of present embodiment.Fig. 2 is the left side view of the related electric tool of present embodiment.Fig. 3 is the figure of the section A-A of presentation graphs 2.Fig. 4 is the major part enlarged drawing of Fig. 3.And in this specification, regulation describes as shown in fig. 1 " forward and backward ".
As shown in Figure 1 to 4, possess as the hand electric grinder 10 of the related electric tool of present embodiment: the mode that can control with operator is formed as roughly housing 11 cylindraceous; For the discoid emery wheel 21 as throw that carries out grinding operation.
Housing 11 forms take following parts as main structure member, that is, as the motor casing 12 of casing, its major part by the motor 31 that becomes drive source is accommodated in inside; Gear box 13, it is configured in the front of motor casing 12, and will receive for transmitting to emery wheel 21 from the actuating force transfer unit being made up of multiple gear trains etc. of the rotary driving force of motor 31; As the back cover 14 of cover member, it is configured in the rear of motor casing 12, and by the power supply unit such as power line, the block terminal storage for motor 31 being supplied with to electric power.
Formed by metal members such as such as aluminium alloys with the gear box 13 that the front side of motor casing 12 links across inner shell 16.And, dispose the emery wheel 21 as throw that carries out grinding operation in the bottom of this gear box 13, in the rear side (rear side) of emery wheel 21, do not disperse and be provided with safety guard 22 to operator in order to make to cut powder etc.
As depict as shown in in-built Fig. 3 of hand electric grinder 10, be accommodated with and become the motor of the drive source for driving emery wheel 21 31 in the inside of motor casing 12.Motor 31 possesses: be fixed on the stator 31a in motor casing 12; Rotatably be configured in the rotor 31b of the inside of stator 31a.Rotor 31b possesses motor reel 32 and commutator 33, and the leading section 32a of motor reel 32 is interior interior outstanding to gear box 13 from motor casing 12, and axle is bearing in the anterior bearing 17 that is assemblied in gear box 13.On the other hand, the rearward end 32b of motor reel 32 is supported by rear bearings 18 axles at the rear portion of motor casing 12.Rear bearings 18 is via in the bearing reception hole 12b that has the end of the bearing support 12c that is bearing in the rear portion that is formed at motor casing 12 as elastomeric bearing rubber 41 with labyrinth sealing formation member 20 described later (with reference to Fig. 4).Therefore, motor reel 32 supports both ends 32a, 32b by bearing 17,18 axles by front and rear part, thereby can High Rotation Speed.In addition, in present embodiment, adopt the deep trouth ball bearing with seal as the bearing 17,18 of front and rear part.
A side of the leading section 32a of motor reel 32 possess with motor 31 in abutting connection with the fan guard 36 of the roughly bowl shape arranging, with fan guard 36 in abutting connection with the cooling fan 19 that arranges and be fixed on motor reel 32.By cooling fan 19 is configured in motor casing 12, play the effect that makes cooling air pass through the inside of motor casing 12.That is, in the time that cooling fan 19 rotates together with motor reel 32, extraneous gas imports from the opening of back cover 14, and after motor 31 etc. is cooling by the gap in back cover 14 and motor casing 12, discharges to equipment from the outlet of gear box 13.
Rotor 31b possesses commutator 33, and commutator 33 is arranged on the rear portion of motor reel 32.Along the brush carrier 38 that is arranged at motor casing 12 slidably directed brush 35 contact with commutator 33.Brush carrier 38, for brush 35 is stably guided to the direction of commutator 33, arranges to the position approaching with the periphery of commutator 33 and extend.For commutator 33 and brush 35 and brush carrier 38, also utilize the cooling air importing by the effect of above-mentioned cooling fan 19 to implement cooling.
Next, dust tight construction and the vibration absorbing structure in 18 formation of rear bearings is described.
As shown in Figure 4, rear bearings 18 possesses outer ring 18a and inner ring 18b and multiple firm ball, and inner ring 18b is pressed into the rearward end 32b that is fixed on motor reel 32.Be equipped with resinous labyrinth sealing at the outer ring of rear bearings 18 18a and form member 20.Labyrinth sealing forms member 20 for cooperating and form the member as the labyrinth gap of dust tight construction with the dustproof axle collar 40 described later.Labyrinth sealing forms the internal side diameter of member 20 and possesses the chimeric patchhole 20a of bearing of the chimeric outer ring 18a that is inserted with rear bearings 18, to form and rear bearings 18 is carried out the contacting wall 20b of butt at the rear side of the chimeric patchhole 20a of bearing than the little internal diameter of the chimeric patchhole 20a of bearing.In addition, the axis direction length setting of the chimeric patchhole 20a of bearing is the axis direction length (width) that is greater than rear bearings 18, make rear bearings 18 chimeric be inserted in the chimeric patchhole 20a of bearing and with the state of contacting wall 20b butt under, the front part that labyrinth sealing forms member 20 is outstanding from the front side side of rear bearings 18.The outside diameter that labyrinth sealing forms member 20 possesses the path peripheral part 20d that has the large footpath peripheral part 20c of the external diameter slightly less than the internal diameter of bearing reception hole 12b, forms in the front of large footpath peripheral part 20c.The allocation position of the path peripheral part 20d part outstanding with the front side side of the rear bearings 18 from above-mentioned is roughly consistent at axis direction.And, be formed with the circumferential slot 20e as elastomer department of assembly for assembling bearing rubber 41 described later at the axis direction central portion of large footpath peripheral part 20c.
The circumferential slot 20a that forms the axis direction central portion formation of the large footpath peripheral part 20c of member 20 in labyrinth sealing is equipped with the bearing rubber 41 as elastomeric ring-type.Form member 20 in labyrinth sealing and be equipped with under the state of bearing rubber 41, the diameter of the outer peripheral face of bearing rubber 41 forms the diameter of the large footpath peripheral part 20c of member 20 and sets slightly largely than labyrinth sealing.Therefore, being equipped with labyrinth sealing forms the rear bearings 18 of member 20 and is bearing in bearing reception hole 12b via bearing rubber 41.Particularly, forming member 20 in labyrinth sealing is equipped with under the state of bearing rubber 41, the diameter of the outer peripheral face of bearing rubber 41 is set as going out greatly 0.1mm～0.9mm than the diameter of the large footpath peripheral part 20c of labyrinth sealing formation member 20, chimeric while being inserted in bearing reception hole 12b under this state, the inner peripheral surface of the outer peripheral face of bearing rubber 41 and bearing reception hole 12b join and the large footpath peripheral part 20c that forms member 20 in labyrinth sealing and the inner peripheral surface of bearing reception hole 12b between formation gap slightly.In addition, in present embodiment, the NBR that bearing rubber 41 is Hs50 ± 5 by rubber hardness is shaped, and labyrinth sealing forms member 20 and is shaped by the Merlon (PC) or the polyamide (PA) that are mixed with glass fibre.And, in present embodiment, the front portion of bearing reception hole 12b is formed with internal diameter towards front openings the wide diameter portion 12d of hole enlargement gently, thereby can be equipped with labyrinth sealing and form the smooth and easy insertion to bearing reception hole 12b of member 20 and the rear bearings 18 of bearing rubber 4.
The dustproof axle collar 40 is for cooperating and form the member as the labyrinth gap of dust tight construction with labyrinth sealing formation member 20.The dustproof axle collar 40 is forming member 20 adjoining positions and is being fixed on the rearward end 32b of motor reel 32 with labyrinth sealing, and its position is in the inner side of bearing reception hole 12b.The dustproof axle collar 40 is the resinous member of general cylindrical shape shape, by make the external diameter of its peripheral part 40b be less than bearing reception hole 12b internal diameter set, thereby between the dustproof peripheral part 40b of the axle collar 40 and the inner peripheral surface of bearing reception hole 12b, form labyrinth gap.And, in rear bearings 18 sides (rear side) of the dustproof axle collar 40 thus side be provided with the 40a of the portion that dodges that the path peripheral part 20d that forms member 20 by inserting labyrinth sealing forms labyrinth gap and forms as the groove of ring-type between this side and path peripheral part 20d.Like this, in present embodiment, form member 20 by the inner peripheral surface by bearing reception hole 12b and the dustproof axle collar 40 with labyrinth sealing and form the labyrinth gap of the intrusion path length of dust, thereby possess sufficient anti-dust performance.And, because the inner peripheral surface by bearing reception hole 12b and the dustproof axle collar 40 and labyrinth sealing form the key element that forms labyrinth gap that member 20 forms and concentrate on the configuration medially of bearing reception hole 12b, therefore realize compact labyrinth sealing and constructed.In addition, in this labyrinth sealing structure, by the key element using the inner peripheral surface of bearing reception hole 12b as formation labyrinth gap, thereby also can adopt in the electric tool of the housing being divided into two.
By above-mentioned structure, in the hand electric grinder 10 of present embodiment, owing to being set to following structure,, form the circumferential slot 20a running in bearings rubber 41 of the large footpath peripheral part 20c of member 20 in resinous labyrinth sealing, and make the rear bearings 18 that is equipped with labyrinth sealing formation member 20 by the structure of bearing reception hole 12b supporting, therefore suppress the vibration of motor 31 to the transmission of housing 11 by the elasticity of bearing rubber 41 across bearing rubber 41.And, by high by form accuracy and because of load and form labyrinth sealing with the few resin of the change of shape causing days and form member 20, thereby labyrinth gap can be set and is maintained in and designs consistent size, thereby can bring into play for a long time anti-dust performance.In addition, by circumferential slot 20a running in bearings rubber 41, can, in the time of chimeric insertion bearing reception hole 12b, prevent the position deviation of bearing rubber 41.
And, due to the outer peripheral face of bearing rubber 41 and the inner peripheral surface of bearing reception hole 12b joins and form between the large footpath peripheral part 20c of member 20 and the inner peripheral surface of bearing reception hole 12b and be formed with gap slightly in labyrinth sealing, therefore, in the time of the running of hand electric grinder 10, when motor reel 32 bears large loading while making the strain quantitative change of bearing rubber 41 large, thereby the large footpath peripheral part 20c that can make labyrinth sealing form member 20 contacts the elastic deformation amount of bearing rubber 41 is limited with the inner peripheral surface of bearing reception hole 12b, therefore the position deviation of motor reel 32 can be converged in feasible value.Therefore, can prevent the unfavorable condition of the stator that causes because of the position deviation of motor reel 32 and contacting of rotor etc.And, can prevent due to the elastic deformation amount's of bearing rubber 41 increase cause deteriorated.
In addition, owing to being formed the member that forms labyrinth gap that member 20 forms by bearing reception hole 12b and the dustproof axle collar 40 and labyrinth sealing and concentrate on the setting medially of bearing reception hole 12b, therefore can realize compact labyrinth sealing structure, thereby can contribute to the miniaturization of electric tool.
In addition,, by the strain of bearing rubber 41, also can realize the absorption that the axis of the motor reel 32 causing because of the error of parts does not overlap.
Above, the execution mode of the best of the present invention is illustrated, but technical scope of the present invention is not limited to the scope of recording in above-mentioned execution mode.Also can be in the additional numerous variations of above-mentioned execution mode or improvement.
For example, in the above-described embodiment, the form of implementing the present application in hand electric grinder 10 is illustrated, but also can carries out in electric trimmer, the first-class enforcement of electric drill.And, in the above-described embodiment, rear bearings 18 is set to deep trouth ball bearing, but also can be set to the bearings such as angular contact ball bearing.In addition, in the above-described embodiment, motor 31 is set to commutator motor, but also can be other forms of motor.
And in the above-described embodiment, the NBR that bearing rubber 41 is Hs504 ± 5 by rubber hardness is shaped, but also can have flexible material forming by silicon rubber, fluorubber etc.And in the above-described embodiment, labyrinth sealing forms member 20 and is shaped by the Merlon (PC) or the polyamide (PA) that are mixed with glass fibre, but also can be formed by metal.
And, in the above-described embodiment, form bearing rubber 41 that the axis direction central portion of the large footpath peripheral part 20c of member 20 forms, as the circumferential slot 20a assembling of elastomer department of assembly as elastomeric ring-type in labyrinth sealing, but also can adopt in the present invention other execution mode.To this, the execution mode of other that can adopt the present invention with reference to Fig. 5 describes.In addition, there is in the following description the part to the incomplete structure explanation same with above-mentioned execution mode.As shown in Figure 5, in the execution mode of other that can adopt in the present invention, bearing reception hole 52 possesses from open side makes forwards gently wide diameter portion 12d, large-diameter portion 52a, the minor diameter part 52b of hole enlargement of opening of internal diameter in order, is formed with wall 52c at the connecting portion of large-diameter portion 52a and minor diameter part 52b.Labyrinth sealing forms member 60 and possesses protruding part 60b at peripheral part 60a.Form with ring-type as elastomeric bearing rubber 71, and assemble adjacently at the labyrinth sealing formation peripheral part 60a of member 60 and the rear side side of protruding part 60b.Be equipped with under the chimeric state that is inserted in bearing reception hole 52 of bearing 18 of labyrinth sealing formation member 60, bearing rubber 71 is configured between protruding part 60b and wall 52c, and the inner peripheral surface of its outer peripheral face and large-diameter portion 52a joins.And, between the outer surface of protruding part 60b and the inner peripheral surface of large-diameter portion 52a, be formed with gap slightly.By adopting this structure, can obtain the effect same with above-mentioned execution mode.
And, in the above-described embodiment, be formed at labyrinth sealing as elastomer department of assembly and forming the circumferential slot 20a of axis direction central portion of the large footpath peripheral part 20c of member 20, assembling is as the bearing rubber 41 of elastomeric ring-type, but also can be set to following structure, that is, the peripheral part that forms member 20 in labyrinth sealing forms as multiple holes of elastomer department of assembly, and in the plurality of hole the structure of the bearing rubber of component location guide post shapes.
Can obviously find out that from the record of the scope of patent request the form of having added this change or improvement is also contained in technical scope of the present invention.
Reference numeral explanation
10-hand electric grinder, 11-housing, 12-motor casing, 12a-concaveconvex shape, 12b-bearing reception hole, 12c-bearing support, 12d-wide diameter portion, 13-gear box, 14-back cover, 16-inner shell, the anterior bearing of 17-, 18-rear bearings, 18a-outer ring, 18b-inner ring, 19-cooling fan, 20-labyrinth sealing forms member, the chimeric patchhole of 20a-bearing, 20b-contacting wall, the large footpath of 20c-peripheral part, 20d-path peripheral part, 20e-circumferential slot, 21-emery wheel, 22-safety guard, 28-switch, 31-motor, 31a-stator, 31b-rotor, 32-motor reel, 32a-leading section, 32b-rearward end, 33-commutator, 35-brush, 36-fan guard, 38-brush carrier, the 40-axle collar that prevents dust, 40a-dodges portion, 40b-peripheral part, 41-bearing rubber, 52-bearing reception hole, 52a-large-diameter portion, 52b-minor diameter part, 52c-wall, 60-labyrinth sealing forms member, 60a-peripheral part, 60b-protruding part, 71-bearing rubber
Claims (5)
1. an electric tool, possesses: as the motor of drive source; Receive the housing of described motor; The motor reel of described motor; Described motor reel is carried out to the bearing of axle supporting; The labyrinth sealing that is assemblied in the outer ring of described bearing forms member; The bearing reception hole that described bearing is supported; Form member with described labyrinth sealing and form that member cooperates and the dustproof axle collar that forms labyrinth gap in abutting connection with configuration and with described labyrinth sealing,
Described electric tool is characterised in that,
Described labyrinth sealing forms in member, be formed with elastomer department of assembly at its peripheral part, at described elastomer, department of assembly is equipped with elastomer, and the described bearing that is equipped with described labyrinth sealing formation member is bearing in described bearing reception hole via described elastomer.
2. electric tool as claimed in claim 1, is characterized in that,
The inner peripheral surface of described elastomeric outer surface and described bearing reception hole joins, and forms between the outer surface of member and the inner peripheral surface of described bearing reception hole and is formed with gap in described labyrinth sealing.
3. electric tool as claimed in claim 1 or 2, is characterized in that,
Described elastomer department of assembly forms as circumferential slot.
4. the electric tool as described in any one in claim 1～3, is characterized in that,
Described elastomer is formed as ring-type.
5. the electric tool as described in any one in claim 1～4, is characterized in that,
Between the outer peripheral face of the described dustproof axle collar and the inner peripheral surface of described bearing reception hole, be formed with labyrinth gap.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-284779 | 2012-12-27 | ||
| JP2012284779A JP6068134B2 (en) | 2012-12-27 | 2012-12-27 | Electric tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103904809A true CN103904809A (en) | 2014-07-02 |
| CN103904809B CN103904809B (en) | 2016-08-17 |
Family
ID=50996000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310585300.6A Active CN103904809B (en) | 2012-12-27 | 2013-11-19 | Electric tool |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6068134B2 (en) |
| CN (1) | CN103904809B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106363582A (en) * | 2015-07-23 | 2017-02-01 | 利优比株式会社 | Handheld power tool |
| CN113840705A (en) * | 2019-07-11 | 2021-12-24 | 喜利得股份公司 | Dust cap with vibration decoupling |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015210070A1 (en) * | 2015-06-01 | 2016-12-01 | Robert Bosch Gmbh | Hand tool |
| CN107914206A (en) * | 2016-10-09 | 2018-04-17 | 苏州宝时得电动工具有限公司 | Brushless angle grinder |
| CN108134470B (en) * | 2018-03-19 | 2023-12-26 | 新誉轨道交通科技有限公司 | Compact traction motor end cover |
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| US5261528A (en) * | 1992-04-01 | 1993-11-16 | Milan Bouchal | Roller for belt conveyor |
| CN2138853Y (en) * | 1992-10-19 | 1993-07-21 | 陈元祥 | Anti-dust, vibration-proof cushion cover of motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106363582A (en) * | 2015-07-23 | 2017-02-01 | 利优比株式会社 | Handheld power tool |
| CN113840705A (en) * | 2019-07-11 | 2021-12-24 | 喜利得股份公司 | Dust cap with vibration decoupling |
| CN113840705B (en) * | 2019-07-11 | 2023-11-28 | 喜利得股份公司 | Dust cap with vibration decoupling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103904809B (en) | 2016-08-17 |
| JP2014124745A (en) | 2014-07-07 |
| JP6068134B2 (en) | 2017-01-25 |
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Effective date of registration: 20180530 Address after: Hiroshima County Patentee after: KYOCERA Industrial Tools Co., Ltd. Address before: Hiroshima County, Japan Patentee before: Ryobi Ltd. |