CN207380448U - A kind of elasticity back gear - Google Patents
A kind of elasticity back gear Download PDFInfo
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- CN207380448U CN207380448U CN201721406945.9U CN201721406945U CN207380448U CN 207380448 U CN207380448 U CN 207380448U CN 201721406945 U CN201721406945 U CN 201721406945U CN 207380448 U CN207380448 U CN 207380448U
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- back gear
- wheel
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- piece
- elastic
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Abstract
The utility model discloses a kind of elastic back gears, including the first back gear piece and tight fit across tooth shaft, first back gear piece and transmission wheel, minute wheel and third wheel is divided to engage simultaneously, it is engaged across tooth shaft with hour wheel, across being also socketed with rotatable second back gear piece in tooth shaft, the first back gear piece is equal with the second back gear plate shape, size；Elastic connection in the circumferential between first back gear piece and the second back gear piece；Second back gear piece is in the state of elastic force balance with transmission wheel, minute wheel and third wheel being divided to engage simultaneously.The beneficial effects of the utility model are：It can be on the premise of it need not improve manufacturing process and assembly technology, diastema problem caused by thoroughly eliminating gear clearance.
Description
Technical field
The utility model is related to wrist-watch fields, are specifically a kind of elastic back gear.
Background technology
There are many gears in mechanical watch, when operation is engaged with each other.Gap is left between intermeshing tooth and tooth, with side
Civilian dress is matched somebody with somebody.When wrist-watch is in simple one-way movement, which will not impact substantially, and when wrist-watch needs manually to fall to dial
When pointer, which may result in wrist-watch and forms rotation diastema.For partial center structure movement, when being moved when walking
A point third wheel first to be driven to rotate, so as to by a back gear minute wheel and hour wheel be driven to indicate the time, which results in diastema phenomenons
Than more serious.It solves the problems, such as this, only significantly compresses gear backlash, make its infinite approach zero, but this is limited by
Manufacturing process and assembly technology are difficult to have breakthrough in middle or short term.Therefore, generally believe the diastema in the range of 5-10s in the industry
Belong to acceptable normality.Chinese patent literature CN2783379Y, being disclosed on May 24th, 2006 " can eliminate wrist-watch hour hands
The when minute hand separating mechanism of hysteresis ", including：Minute wheel, upper minute wheel, inclined back gear piece, partially across tooth shaft and small hour wheel；Described is upper
Minute wheel forms coaxial integral structure with minute wheel；It is described inclined to form coaxial integral structure across tooth shaft and inclined back gear piece；Described is upper
Minute wheel is meshed with inclined back gear piece, described inclined to be meshed across tooth shaft with small hour wheel.The program attempt by reduce gear quantity,
Transmission link is compressed to reduce diastema, especially reduces the superposition of diastema, it, still can not be thorough although having certain effect
Eliminate diastema.
The content of the invention
Based on drawbacks described above, the utility model provides a kind of elastic back gear, can need not improve manufacturing process and assembling
On the premise of technique, diastema problem caused by thoroughly eliminating gear clearance.
In order to realize goal of the invention, the utility model adopts the following technical solution：A kind of elasticity back gear, including the first back gear
Piece and tight fit across tooth shaft, the first back gear piece and transmission wheel, minute wheel and third wheel is divided to engage simultaneously, is engaged across tooth shaft with hour wheel,
Across being also socketed with rotatable second back gear piece in tooth shaft, the first back gear piece is equal with the second back gear plate shape, size；First
Elastic connection in the circumferential between back gear piece and the second back gear piece；Second back gear piece in the state of elastic force balance with transmission wheel,
Minute wheel and third wheel is divided to engage simultaneously.
Traditional back gear piece, be simultaneously with transmission wheel, minute wheel and dividing third wheel to engage, between having between the tooth and tooth of engagement
Gap.And the elastic back gear of the technical program design, equipped with the identical equal sized double-back gear piece of shape, the first back gear piece and across tooth
Axis tight fit, it is consistent with traditional back gear；And the second back gear piece newly increased is rotatably socketed in across in tooth shaft, and with first
Elastic connection in the circumferential between back gear piece, in the case of elastic force balance, the second back gear piece also simultaneously with transmission wheel, minute wheel and
The engagement of point third wheel so that transmission wheel, minute wheel and third wheel is divided to be engaged simultaneously with the first back gear piece, the second back gear piece, and due to
The reason of elastic force balance, the first back gear piece, the second back gear piece have the trend reversed mutually along elastic force direction, for engagement object
Backlash be respectively formed and fill up effect.During installation, as long as by the first back gear piece, the second several tooth positions of back gear piece torsiversion malposition,
Make elastic connecting element it is pre- it is next engagement is installed again, with regard to diastema phenomenon caused by completely eliminating gear clearance.
Preferably, back gear spring is equipped between the first back gear piece and the second back gear piece；Back gear spring one end is fixed on
One back gear on piece, the other end are fixed on the second back gear on piece.Back gear spring is a kind of wire spring, selects suitable elastic force and curved
The steel wire of degree is made, and there is the hook for connecting at both ends.It can be with relatively low cost of parts and higher installation using back gear spring
Efficiency realizes elastic connection.
Preferably, the first back gear piece be close to positioned at the top of the second back gear piece；The lower face of first back gear piece and/or
The upper surface of second back gear piece is equipped with spring groove, and back gear spring is arranged in spring groove.Due to applying on wrist-watch, need
The volume for keeping part is sufficiently small, for this purpose, the first back gear piece is close to design by this programme with the second back gear piece, and in the two
Groove is devised on contact surface, to accommodate back gear spring, so design can make overall structure sufficiently thin, meet watch
The layout requirements of core.
In conclusion the beneficial effects of the utility model are：It can be before it need not improve manufacturing process and assembly technology
It puts, diastema problem caused by thoroughly eliminating gear clearance.
Description of the drawings
Fig. 1 is the axial arrangement schematic diagram of the utility model.
Fig. 2 is the planar structure schematic diagram of the utility model.
Fig. 3 is the working state schematic representation for the elastic back gear mechanism that the utility model is formed.
Fig. 4 is the working state schematic representation of traditional back gear mechanism.
Wherein：1 transmission wheel, 2 minute wheels, 3 hour wheels, 4 points of third wheels, 7 first back gear pieces, 8 second back gear pieces, 9 across tooth shaft, 10 across
Take turns spring, 11 spring grooves, A elasticity back gears, B tradition back gears.
Specific embodiment
The utility model is further described with specific embodiment below in conjunction with the accompanying drawings.
Embodiment as shown in Figure 1 and Figure 2 is a kind of elastic back gear, and Fig. 3 is using the elasticity back gear as core component
Elastic back gear mechanism, is applied in the watch core of certain mechanical watch.
The elastic back gear of this example, longitudinal across being installed in tooth shaft 9 there are two back gear piece, top is and across tooth shaft tight fit
The first back gear piece 7, be close to the first back gear piece lower face be can be around the second back gear piece 8 being freely rotated across tooth shaft.First across
It takes turns piece and the second back gear plate shape is identical, it is equal sized.The lower face of first back gear piece is equipped with the spring groove 11 of fovea superior, back gear
Spring 10 is arranged in spring groove, and one end is fixed on the first back gear on piece, and the other end is fixed on the second back gear on piece, around across tooth
Elastic pulling force is formed to two back gear pieces in the rotation direction of axis.In the absence of external forces, which can be
Relatively independent rotation in elastic range in elastic connection stress and during back gear spring pre-tightening, can be pulled mutually and interacted.
As shown in figure 4, in traditional elastic back gear mechanism, traditional back gear B only there are one back gear piece, with transmission wheel 1, point
It takes turns 2 and divides third wheel 4 while engage, and engaged across tooth shaft with hour wheel 3.When movement normally walking constantly, divide third wheel can be with tradition
Back gear rotates counterclockwise, so as to be rotated clockwise with minute wheel and hour wheel.When needing pulling needle counterclockwise, transmission wheel 1 is clockwise
It rotates, then traditional back gear is driven to rotate counterclockwise, traditional back gear can be with dividing third wheel, minute wheel and hour wheel 3 to rotate clockwise.Cause
After the completion of movement pulling needle counterclockwise, dividing third wheel needs that will first the backlash between third wheel and traditional back gear be divided to cover could band for this
Dynamic tradition back gear rotates, and this generates larger diastema.Also there is similary problem during pulling needle clockwise, when movement pulling needle clockwise
After finishing, divide third wheel that traditional back gear is driven to turn counterclockwise, traditional back gear is needed the backlash between minute wheel and traditional back gear first
Covering could rotate clockwise with minute wheel, this can also generate larger diastema.
And in this example, as shown in figure 3, using elasticity back gear A instead of traditional back gear, as long as when mounted by first across
Piece, the second several tooth positions of back gear piece torsiversion malposition are taken turns, is installed again after making back gear spring pre-tightening, makes the first back gear piece, the second back gear
Piece is simultaneously with transmission wheel, minute wheel and dividing third wheel to engage.Under this state, if without external force, the first back gear piece and the second back gear piece
The tooth both sides of engagement object are respectively held against, fill up backlash, no matter the first back gear piece is rotated to which direction, engages object
At least one back gear piece of between cog and its close overlap joint, there is no gaps.After the completion of movement pulling needle counterclockwise, divide third wheel can
It is rotated counterclockwise with directly band dynamic elasticity back gear, so as to eliminate diastema；After the completion of movement pulling needle clockwise, third wheel is divided to drive
Elastic back gear turns counterclockwise, and elastic back gear directly can drive minute wheel to rotate clockwise, so as to eliminate diastema.
Claims (3)
1. a kind of elasticity back gear, including the first back gear piece（7）With tight fit across tooth shaft（9）, the first back gear piece and transmission wheel
（1）, minute wheel（2）With divide third wheel（4）It engages simultaneously, across tooth shaft and hour wheel（3）Engagement, it is characterized in that, across being also socketed in tooth shaft
Rotatable second back gear piece（8）, the first back gear piece is equal with the second back gear plate shape, size；First back gear piece and second
Elastic connection in the circumferential between back gear piece；Second back gear piece is in the state of elastic force balance with transmission wheel, minute wheel and dividing third wheel
It engages simultaneously.
2. a kind of elastic back gear according to claim 1, it is characterized in that, it is equipped between the first back gear piece and the second back gear piece
Back gear spring（10）；Back gear spring one end is fixed on the first back gear on piece, and the other end is fixed on the second back gear on piece.
3. a kind of elastic back gear according to claim 2, it is characterized in that, what the first back gear piece was close to is located at the second back gear piece
Top；The lower face of first back gear piece and/or the upper surface of the second back gear piece are equipped with spring groove（11）, back gear spring is arranged on
In spring groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721406945.9U CN207380448U (en) | 2017-10-27 | 2017-10-27 | A kind of elasticity back gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721406945.9U CN207380448U (en) | 2017-10-27 | 2017-10-27 | A kind of elasticity back gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207380448U true CN207380448U (en) | 2018-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721406945.9U Active CN207380448U (en) | 2017-10-27 | 2017-10-27 | A kind of elasticity back gear |
Country Status (1)
| Country | Link |
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| CN (1) | CN207380448U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213934A (en) * | 2018-07-31 | 2021-01-12 | 蒙特雷布勒盖股份有限公司 | Timepiece display mechanism with elastic hands |
-
2017
- 2017-10-27 CN CN201721406945.9U patent/CN207380448U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213934A (en) * | 2018-07-31 | 2021-01-12 | 蒙特雷布勒盖股份有限公司 | Timepiece display mechanism with elastic hands |
| CN112213934B (en) * | 2018-07-31 | 2021-11-19 | 蒙特雷布勒盖股份有限公司 | Timepiece display mechanism with elastic hands |
| US11537080B2 (en) | 2018-07-31 | 2022-12-27 | Montres Breguet S.A. | Timepiece display mechanism with a resilient hand |
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