CN205715474U - A kind of change gear case of electric tool - Google Patents
A kind of change gear case of electric tool Download PDFInfo
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- CN205715474U CN205715474U CN201620287765.2U CN201620287765U CN205715474U CN 205715474 U CN205715474 U CN 205715474U CN 201620287765 U CN201620287765 U CN 201620287765U CN 205715474 U CN205715474 U CN 205715474U
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- change gear
- scotch
- snap ring
- locating snap
- speed change
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Abstract
A kind of change gear case of electric tool, including tooth case shell, speed change gear ring and locating snap ring, described tooth case shell offers accommodating speed change gear ring the containing cavity moved axially for speed change gear ring, described locating snap ring is fixing to be assemblied in tooth case shell inwall and is radially in described containing cavity, described locating snap ring includes the body in loop shaped and is convexly equipped with multiple scotch from body end face axial uniform intervals, stop bit slot is formed between scotch, interval, described speed change gear ring end is convexly equipped with the clutch inserted block that can coordinate with described stop bit slot grafting, owing to the scotch of locating snap ring is axially convexly equipped in locating snap ring body, scotch is consistent with speed change gear ring clutch direction along height bearing of trend, scotch height can be rationally set, it is not required to be affected by containing cavity radial dimension, grafting clutch reliability is high, overall construction intensity is high, dependability is high, service life is long.
Description
Technical field
This utility model relates to electric tool technical field, particularly relates to a kind of change gear case of electric tool.
Background technology
Current drill type electric tool is generally of several speed operation pattern, thus typically has speed switching mechanism, to realize the output of different rotating speeds.
More typically, the speed switching mechanism of some electric tools is realized by speed change gear ring, its structure is usually speed change gear ring and coordinates with locked spacer clutch, when speed change gear ring is engaged with locked spacer, its rotation is restricted, to realize low speed output, speed change gear ring is free to rotate to realize speedy carding process when separating with locked spacer.
But, above-mentioned speed switching mechanism, in use, due to speed change gear ring and locked spacer clutch operation frequently, the easy impact wear in joint portion, increasing with the time of use, between the speed change gear ring caused because of abrasion and locked spacer, fit clearance increases, and easily causes clutch quality of fit and declines, and operate in high torque, or when operating carries out speed switching, be easily caused part-structure and burst apart inefficacy, affect service life and dependability.
Utility model content
Based on this, it is necessary to for the problems referred to above, it is provided that a kind of structural strength is high, and service life is long, the change gear case of electric tool that dependability is high.
A kind of change gear case of electric tool, including tooth case shell, speed change gear ring and locating snap ring, described tooth case shell offers accommodating speed change gear ring the containing cavity moved axially for speed change gear ring, described locating snap ring is fixing to be assemblied in tooth case shell inwall and is radially in described containing cavity, described locating snap ring includes the body in loop shaped and is convexly equipped with multiple scotch from body end face axial uniform intervals, forming stop bit slot between scotch, interval, described speed change gear ring end is convexly equipped with the clutch inserted block that can coordinate with described stop bit slot grafting.
Wherein in an embodiment, described scotch is just formed with circular arc chamfering to the end, one end of clutch inserted block.
Wherein in an embodiment, described scotch connects the root lateral margin of body and is formed with reinforcing chamfer.
Wherein in an embodiment, described tooth case shell includes fore shell and back cover, the internal chamber wall of described fore shell axially offers a plurality of breach, and the screens groove that the circumference connected with each breach respectively is offered, the outer wall of described back cover is convexly equipped with a plurality of protrusion rib block, described protrusion rib block thickness matches with described screens groove groove width, the body outer rim radial convex of described locating snap ring is provided with plurality of bump, described bump width matches with described gap width, during assembling, each described projection is connected in the described breach of correspondence respectively, each described protrusion rib block spinner respectively is in corresponding described screens groove, hold out against after described back cover and fore shell assembly connection and place restrictions on described locating snap ring.
Wherein in an embodiment, described screens groove forms guiding port less than opposite side cell wall length in the position connecting described breach near the side cell wall length of back cover.
Wherein in an embodiment, the body of described locating snap ring, scotch and projection all one powder compactings.
Above-mentioned change gear case of electric tool, owing to the scotch of locating snap ring is axially convexly equipped in locating snap ring body, scotch is consistent with speed change gear ring clutch direction along height bearing of trend, so scotch height can rationally be arranged according to clutch impact strength, it is not required to be affected by containing cavity radial dimension, grafting clutch reliability is high, overall construction intensity is high, it is difficult to during use burst apart and structural failure, add the service life of device, and abrasion is mainly formed in scotch and clutch inserted block end during using, overall clutch precision is unaffected, and dependability is high.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is middle change gear case of electric tool decomposition texture schematic diagram；
Fig. 2 is the working state schematic representation that in an embodiment, change gear case of electric tool speed change gear ring coordinates with locating snap ring grafting；
Fig. 3 is the partial structurtes enlarged drawing in Fig. 1 at A.
Wherein: 1 fore shell, 11 breach, 13 screens grooves, 131 guiding ports, 2 back covers, 21 protrusion rib block, 3 locating snap ring bodies, 31 projections, 32 scotch, 321 circular arc chamferings, 322 reinforcing chamfers, 33 stop bit slots, 4 speed change gear rings, 42 clutch inserted blocks.
Detailed description of the invention
For the ease of understanding this utility model, below with reference to relevant drawings, this utility model is described more fully.Accompanying drawing gives preferred embodiment of the present utility model.But, this utility model can realize in many different forms, however it is not limited to embodiment described herein.On the contrary, providing the purpose of these embodiments is to make the understanding to disclosure of the present utility model more thorough comprehensively.
Such as Fig. 1, shown in Fig. 2 and Fig. 3, a kind of change gear case of electric tool, including tooth case shell, speed change gear ring 4 and locating snap ring, described tooth case shell offers accommodating speed change gear ring 4 containing cavity moved axially for speed change gear ring 4, described locating snap ring is fixing to be assemblied in tooth case shell inwall and is radially in described containing cavity, described locating snap ring includes the body in loop shaped and is convexly equipped with multiple scotch 32 from body end face axial uniform intervals, stop bit slot 33 is formed between scotch 32, interval, described speed change gear ring 4 end is convexly equipped with the clutch inserted block 42 that can coordinate with the grafting of described stop bit slot 33.
This change gear case of electric tool, owing to the scotch 32 of locating snap ring is axially convexly equipped in locating snap ring body 3, scotch 32 is consistent with speed change gear ring 4 clutch direction along height bearing of trend, so scotch 32 height can rationally be arranged according to clutch impact strength, is not required to be affected by containing cavity radial dimension.On the one hand grafting clutch reliability is high, and overall construction intensity is high, is difficult to burst apart and structural failure, adds the service life of device during use；On the other hand being not take up containing cavity radial space due to scotch 32, so being conducive to reducing electric tool radial dimension on the premise of ensureing structural strength, optimizing electric tool space layout.And abrasion is mainly formed in scotch 32 and clutch inserted block 42 is mutually inserted end during using, overall clutch precision is unaffected, and dependability is high.
Wherein in an embodiment, described scotch 32 is just formed with circular arc chamfering 321 to the end, one end of clutch inserted block 42.Described circular arc chamfering 321 is conducive to grafting to guide, and makes clutch inserted block 42 insert stop bit slot 33 smooth and easy, decreases clutch impact, advantageously reduces abrasion, improves dependability, extend service life.
Wherein in an embodiment, described scotch 32 connects the root lateral margin of body and is formed with reinforcing chamfer 322.The setting of described reinforcing chamfer 322, improves the bonding strength of scotch 32 and body, and avoids scotch 32 Root Stress to concentrate, and reduces further and impacts the risk decomposed of bursting apart.
Wherein in an embodiment, described scotch 32 height of projection not less than the 1/3 of body thickness, and 3 times of no more than body thickness.Described scotch 32 height of projection the most rationally can be arranged according to the performance requirement of the electric tool such as rotating speed, moment of torsion.
Wherein in an embodiment, described tooth case shell includes fore shell 1 and back cover 2, the internal chamber wall of described fore shell 1 axially offers a plurality of breach 11, and the screens groove 13 that the circumference connected with each breach 11 respectively is offered, the outer wall of described back cover 2 is convexly equipped with a plurality of protrusion rib block 21, described protrusion rib block 21 thickness matches with described screens groove 13 groove width, the body outer rim radial convex of described locating snap ring is provided with plurality of bump 31, described projection 31 width matches with described breach 11 width, during assembling, each described projection 31 is connected in the described breach 11 of correspondence respectively, each described protrusion rib block 21 spinner respectively is in corresponding described screens groove 13, hold out against after described back cover 2 and fore shell 1 assembly connection and place restrictions on described locating snap ring.So, due to the restriction to projection 31 of the described breach 11 after assembling, locating snap ring circumference movement is placed restrictions on, and be fixed on fore shell 1 due to back cover 2 spinner locating snap ring is held out against, locating snap ring moves axially and is placed restrictions on, and places restrictions in tooth case shell so that locating snap ring is fixing, assembles simple and reliable, and it is conveniently replaceable locating snap ring, improve ease of use.
Wherein in an embodiment, described screens groove 13 forms guiding port 131 less than opposite side cell wall length in the position connecting described breach 11 near the side cell wall length of back cover 2.By described guiding port 131, during assembling, the protrusion rib block 21 of back cover 2 easily inserts and spinner is in screens groove 13, further increases assembling convenience.
Wherein in an embodiment, the body of described locating snap ring, scotch 32 and projection 31 all one powder compactings.Metal dust molding is the technical process making briquet that the closely knit one-tenth of metal powder opisthosoma has definite shape, size, density and intensity.By the one-body molded described locating snap ring of powder technology, it is to avoid the stress in technical process gathers, structural strength is high, and functional reliability is high, and machining accuracy is high.As required, powder pressing forming or powder injection-molded can be used.
Embodiment described above only have expressed several embodiments of the present utility model, and it describes more concrete and detailed, but therefore can not be interpreted as the restriction to this utility model the scope of the claims.It should be pointed out that, for the person of ordinary skill of the art, without departing from the concept of the premise utility, it is also possible to make some deformation and improvement, these broadly fall into protection domain of the present utility model.Therefore, the protection domain of this utility model patent should be as the criterion with claims.
Claims (6)
1. a change gear case of electric tool, including tooth case shell, speed change gear ring and locating snap ring, described tooth case shell offers accommodating speed change gear ring the containing cavity moved axially for speed change gear ring, described locating snap ring is fixing to be assemblied in tooth case shell inwall and is radially in described containing cavity, it is characterized in that, described locating snap ring includes the body in loop shaped and is convexly equipped with multiple scotch from body end face axial uniform intervals, forming stop bit slot between scotch, interval, described speed change gear ring end is convexly equipped with the clutch inserted block that can coordinate with described stop bit slot grafting.
Change gear case of electric tool the most according to claim 1, it is characterised in that described scotch is just formed with circular arc chamfering to the end, one end of clutch inserted block.
Change gear case of electric tool the most according to claim 1, it is characterised in that described scotch connects the root lateral margin of body and is formed with reinforcing chamfer.
4. according to the change gear case of electric tool described in claim 1 ~ 3 any one, it is characterized in that, described tooth case shell includes fore shell and back cover, the internal chamber wall of described fore shell axially offers a plurality of breach, and the screens groove that the circumference connected with each breach respectively is offered, the outer wall of described back cover is convexly equipped with a plurality of protrusion rib block, described protrusion rib block thickness matches with described screens groove groove width, the body outer rim radial convex of described locating snap ring is provided with plurality of bump, described bump width matches with described gap width, during assembling, each described projection is connected in the described breach of correspondence respectively, each described protrusion rib block spinner respectively is in corresponding described screens groove, hold out against after described back cover and fore shell assembly connection and place restrictions on described locating snap ring.
Change gear case of electric tool the most according to claim 4, it is characterised in that described screens groove forms guiding port less than opposite side cell wall length in the position connecting described breach near the side cell wall length of back cover.
Change gear case of electric tool the most according to claim 4, it is characterised in that the body of described locating snap ring, scotch and projection all one powder compactings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620287765.2U CN205715474U (en) | 2016-04-08 | 2016-04-08 | A kind of change gear case of electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620287765.2U CN205715474U (en) | 2016-04-08 | 2016-04-08 | A kind of change gear case of electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205715474U true CN205715474U (en) | 2016-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620287765.2U Active CN205715474U (en) | 2016-04-08 | 2016-04-08 | A kind of change gear case of electric tool |
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| Country | Link |
|---|---|
| CN (1) | CN205715474U (en) |
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2016
- 2016-04-08 CN CN201620287765.2U patent/CN205715474U/en active Active
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