CN207778938U - Automatic switch drawer mechanism with thumb wheel clutch - Google Patents

Abstract

The utility model provides a kind of automatic switch drawer mechanism comprising motor, output rack, thumb wheel clutch and clutch wheel disc component.Thumb wheel clutch includes thumb wheel and thumb wheel resetting-mechanism, and clutch wheel disc component includes output gear and output gear resetting-mechanism, and output rack is fixedly attached to drawer and engages output gear.When electrical power, output gear is driven to continuous rotation, also, thumb wheel is driven to turn over an angle, to stir output gear towards output rack offset so that output gear is engaged with output rack, to which rack be automatically moved and open or close drawer；When motor powers off, thumb wheel reversely turns over angle under the action of thumb wheel resetting-mechanism, also, output gear deviates under the action of output gear resetting-mechanism away from output rack, so that output gear is detached from output rack, to stop being automatically moved rack and stop opening or closing drawer.

Description

Automatic switch drawer mechanism with thumb wheel clutch

Technical field

The utility model is related to the mechanisms for automatic switch drawer, and in particular to be used for certainly with thumb wheel clutch The mechanism of dynamic switch refrigerator drawer.

Background technology

Existing, the drawer door of the household electrical appliance (such as refrigerator) with drawer is all made of manually opened and closes, to real The storage and taking-up of existing article.When storage article is more in drawer, drawer own wt increases, particularly with old man, child For, not only difficulty is big for manually opened drawer, but also has the possibility in the presence of injury personal safety.Such case is prevalent in often A family.

Accordingly it is desirable to which a kind of refrigerator drawer automatic switch mechanism can be integrated or be installed in refrigerator, can meet It needs the storage in refrigerator or automatically opens and closes drawer when taking out article, to allow old man and children into accommodating and peace Full operation.

Utility model content

To solve the above-mentioned problems, one side according to the present utility model, it is proposed that a kind of automatic switch drawer mechanism, institute It includes thumb wheel clutch to state mechanism comprising thumb wheel and thumb wheel resetting-mechanism；Clutch wheel disc component comprising output gear and Output gear resetting-mechanism；Rack is exported, is fixedly attached to drawer, and suitable for engaging the output gear；And power is defeated Enter portion comprising motor, to transfer a driving force to the clutch wheel disc component and the thumb wheel clutch.When the electricity When machine is powered, the output gear is driven to continuously rotate, also, the thumb wheel is driven and turns over an angle, to stir The output gear is deviated towards the output rack so that the output gear is meshed with the output rack, to certainly The rack is moved dynamicly and opens or closes the drawer.When the motor powers off, the thumb wheel is resetted in the thumb wheel The angle is reversely turned under the action of mechanism, also, the output gear is under the action of the output gear resetting-mechanism It is deviated away from the output rack so that the output gear is detached from the output rack, to stop that institute is automatically moved It states rack and stops opening or closing the drawer.

Automatic switch drawer according to the present utility model mechanism, optionally, the thumb wheel include input gear, arc thumb wheel Head and driving lever gear, wherein the input gear receives driving force, and the arc thumb wheel head and the driving lever gear are with described defeated Enter tooth to rotate together.The arc thumb wheel head has the first cam surface, on first cam surface and the clutch wheel disc component Corresponding second cam surface cooperation so that with the rotation of the thumb wheel, between the output gear and the output rack Engagement force gradually increase.

Automatic switch drawer according to the present utility model mechanism, optionally, the thumb wheel resetting-mechanism include fixed block, band The sliding block of rack, the first spring and second spring；Wherein, the sliding block with rack fits along the fixed block and reciprocally slides It moves, also, first spring and the respective one end of the second spring are attached to the side of the sliding block, and its other end is solid The fixed extremely fixed block.When the electrical power, the rotation of the driving lever gear drives the sliding block to be translated from initial position To holding position, meanwhile, the movement of the sliding block promotes first spring and the second spring flexible deformation.When the electricity When machine powers off, first spring and second spring drive the sliding block to move to initial position from holding position, meanwhile, it is described Driving lever gear rotates backward described in the driven in translation of sliding block.

Automatic switch drawer according to the present utility model mechanism, optionally, the clutch wheel disc component include clutch wheel disc, Third output transition wheel and output gear, wherein the output gear and the third output transition wheel are rotatably supported at It on the clutch wheel disc and keeps being engaged with each other, also, the clutch wheel disc can surround turning for the third output transition wheel Shaft rotation is dynamic, to drive the output gear to be deviated towards the output rack；Wherein, the side wall of the clutch wheel disc is equipped with the Two cam surfaces, second cam surface the first cam surface cooperation corresponding on the thumb wheel, so that with the thumb wheel Rotation, the engagement force between the output gear and the output rack gradually increase.

Automatic switch drawer according to the present utility model mechanism, optionally, the output gear resetting-mechanism includes third One end of spring, the third spring is nested in the fixed column of the clutch wheel disc, and other end holding is relatively fixed.Work as institute When stating electrical power, the clutch wheel disc deviates under the stirring of the thumb wheel towards the output rack, while overcoming described The spring force of third spring；When the motor powers off, the third spring drives the clutch wheel disc far from the output gear Item deviates.

Automatic switch drawer according to the present utility model mechanism, optionally, the rotational angle of the thumb wheel be more than 165 ° and Less than 180 °.

Automatic switch drawer according to the present utility model mechanism, optionally, the power input unit further includes worm screw and snail Wheel, the motor is rotated via worm gear described in the worm drive, with output driving power.

Automatic switch drawer according to the present utility model mechanism, optionally, automatic switch drawer mechanism further includes magnetic Steel wheel unit, the magnet steel wheel assembly include magnet steel axle tooth, torsional spring, magnet steel wheel and quoit gear.The motor drives institute The rotation of magnet steel axle tooth is stated, the magnet steel axle tooth drives the magnet steel wheel to be rotated with equal uniform velocity by the torsional spring, described Magnet steel wheel is that the quoit gear applies a constant rotary force by eddy current effect.It is described under the action of the rotary force Quoit gear drives the thumb wheel to turn over the angle, also, the thumb wheel is caused persistently to be pressed against the clutch wheel disc component, To maintain the engagement force between the output gear and the output rack.

Automatic switch drawer according to the present utility model mechanism, optionally, the rotation of the worm gear were exported via first Ferry boat is transferred to the magnet steel axle tooth, also, the rotation of the quoit gear is slowed down and passed via at least level-one transition wheel It is handed to the thumb wheel.

Automatic switch drawer according to the present utility model mechanism, optionally, automatic switch drawer mechanism further include double To sliding mechanism, the two-way sliding mechanism includes skidding axis tooth and beats pulley sheet, and the outer wall of the skidding axis tooth is equipped with more A elastic cantilever, the end of each elastic cantilever are equipped with the protrusion of symmetrical structure, and the inner wall for beating pulley sheet is equipped with and institute State the spline of the symmetrical structure of convex shape cooperation.In normal operation, the protrusion and the spline engagement are thus described to beat Slide-bar tooth and the pulley sheet of beating are in meshing state.When by external force forward or backwards, the skidding axis tooth and described The strong relative rotation power of moment forces the inside elastic shrinkage of the elastic cantilever between beating pulley sheet so that the protrusion with it is described Spline is detached from, and thus the skidding axis tooth is detached from pulley sheet is beaten.

Automatic switch drawer according to the present utility model mechanism, optionally, the rotation of the worm gear are transferred to the skidding Piece is taken turns, then the second output transition wheel is transferred to via the skidding gear teeth, second output transition wheel drives the third defeated Go out transition wheel rotation, to drive the output gear to rotate.

Another aspect according to the present utility model, it is proposed that a kind of refrigerator comprising according to automatic switch described above Drawer mechanism.

Automatic switch drawer according to the present utility model mechanism and refrigerator can have the following effects that in it is one or more：

In electrical power, output gear is engaged with output rack holding, to drive drawer to be automatically turned on or close It closes, automatically to open or close refrigerator drawer, to improve the convenience and reliability of operation.

It is rotated and is resetted to realize engaging between output gear and output rack and disengaging using lever body.Driving lever Mechanical stability is high, also, engaging between output gear and output rack is an increased process slowly and between torque, So as to the direct impact adverse effect for avoiding output gear with exporting rack.

The reply of thumb wheel clutch is realized using spring part, can be realized whole flat while meeting transmission agency Steady operation, and external impacts can be resisted.

Magnet steel wheel is used to provide rotary force for thumb wheel clutch, it is simple in structure, and since magnet steel wheel passes through turbine Effect drives the rotation of quoit gear, and rotary resistance between the two is small, saves energy consumption, and the impact for being also act against external force is made With.

Two-way sliding mechanism is used, it is simple in structure, help to resist the automatic drawing switch artificially forced in operation Impact force in mechanism, can effectively protect motor damage.

It is hereafter described in detail in conjunction with the accompanying drawings for realizing the one of the utility model as defined in the appended claims A little optimal modes and embodiment are therefrom readily appreciated that the features described above and advantage and other feature and advantage of the utility model.

Description of the drawings

Fig. 1 shows the perspective view of the automatic switch drawer mechanism of embodiment according to the present utility model；

Fig. 2 is the perspective view of the power input unit in the automatic switch drawer mechanism of Fig. 1；

Fig. 3 is the perspective view of the output gear train in the automatic switch drawer mechanism of Fig. 1；

Fig. 4 is the perspective view of the clutch tooth train in the automatic switch drawer mechanism of Fig. 1；

Fig. 5 A to Fig. 5 B are switched on the perspectives and plans of thumb wheel clutch and clutch wheel disc component under state；

Fig. 6 A to Fig. 6 B are powered off the perspectives and plans of thumb wheel clutch and clutch wheel disc component under state；

Fig. 7 A to Fig. 7 B are the assembling view and decomposition perspective view of thumb wheel clutch；

Fig. 8 A to Fig. 8 B are the assembling view and decomposition perspective view of clutch wheel disc component；

Fig. 9 shows the elastic force of three springs with the illustrative diagram of thumb wheel angle change；

Figure 10 A to Figure 10 C are the assembling view, sectional view and decomposition perspective view of magnet steel wheel assembly respectively；

Figure 11 A are the assembling views of the sliding mechanism of embodiment according to the present utility model；

Figure 11 B and Figure 11 C are the perspective view for beating pulley sheet of the sliding mechanism of embodiment according to the present utility model respectively And plan view；

Figure 11 D and Figure 11 E are the perspective view of the skidding axis tooth of the sliding mechanism of embodiment according to the present utility model respectively And plan view；

Figure 12 A and Figure 12 C are the assembling view and assembling view of the sliding mechanism of the prior art respectively；

Figure 12 B and Figure 12 D are the perspectives and plans for beating pulley sheet of the sliding mechanism of the prior art respectively；

Figure 12 E and Figure 12 F are the perspectives and plans of the skidding axis tooth of the sliding mechanism of the prior art respectively.

Reference numeral

10 power input units

11 motors

12 worm screws

13 worm gears

20 clutch tooth trains

21 first output transition wheels

22 magnet steel wheel assemblies

221 quoit gears

222 magnet steel wheels

223 torsional springs

224 magnet steel wheel gears

23 First Transition wheels

24 second transition wheels

25 thumb wheel clutches

250 thumb wheels

251 input gears

252 arc thumb wheel heads

253 driving lever gears

255 thumb wheel resetting-mechanisms

256 fixed blocks

257 sliding blocks with rack

The first springs of S1

S2 second springs

30 output gear trains

31 sliding mechanisms

311 skidding axis teeth

312 dozens of pulley sheets

32 second output transition wheels

33 clutch wheel disc components

331 clutch wheel discs

332 third output transition wheels

333 output gears

S3 third springs

34 output racks

Specific implementation mode

Description describes the exemplary embodiment of the utility model.In the drawings, identical reference numeral indicates Identical or corresponding part.By description, the feature and advantage of the utility model will be evident.As an example, hereafter being retouched The automatic switch drawer mechanism stated is applied to the drawer of refrigerator.However, term " drawer " can mean it is any can be with automatic switch Drawer, such as micro-wave oven, refrigerator-freezer, magazine etc. in drawer.

Fig. 1 shows the overall perspective view of automatic switch drawer mechanism accoding to exemplary embodiment, includes mainly dynamic Power input unit 10, clutch tooth train 20 and output gear train 30.In addition, the mechanism can also include other routines such as fixed shell Component, but it is for the sake of clarity not shown in figures.

Power input unit 10 has been shown in particular in Fig. 2, is used to specifically move for automatic switch drawer mechanism input power The power of rotation formula is transferred to clutch tooth train 20 and output gear train 30 by power input unit 10.As shown, power inputs Portion 10 includes motor 11, worm screw 12 and worm gear 13.Motor 11 can be driven when being powered with forward or reverse, to for it is entire from Dynamic switch drawer mechanism provides power source.The output shaft of motor 11 is attached to worm screw 12, and rotation is transferred to positioned at snail by worm screw 12 The worm gear 13 of 12 side of bar, wherein the pivot center of worm gear 13 is vertical with the pivot center of worm screw 12 (i.e. 11 output shaft of motor). Motor 11 can lie low arrangement as a result, so that its height is located in the principal plane of automatic switch drawer mechanism, it is automatic to reduce Switch the occupancy volume of drawer mechanism.A variety of motor forms and specification may be used in motor 11.Preferably, motor 11 can be step Stepper motor, to accurately control stroke and to significantly reduce noise.

Clutch tooth train 20 has been shown in particular in Fig. 3, is operable as driving the power of entire automatic switch drawer mechanism Lasting output and stopping.Clutch tooth train 20 includes clutch gear component and thumb wheel clutch 25.Clutch gear component is used for The power of power input unit 10 is transferred to thumb wheel clutch 25.In the illustrated embodiment, the clutch gear component can be with Including the first input transition wheel 21, magnet steel wheel assembly 22 and at least level-one middle transition wheel 23,24.First input transition wheel 21 engage with aforementioned worm gear 13, and rotation is transferred to the input shaft tooth 221 of 22 lower section of magnet steel wheel assembly.Magnet steel road component 22 Rotation is transferred to the input gear 251 of thumb wheel clutch 25 via middle transition wheel by the output shaft tooth 222 on top, to drive Dynamic thumb wheel clutch 25 rotates.Middle transition wheel group may include the First Transition wheel 23 and the second transition wheel being engaged with each other 24, respectively there is setting gear ratio, to realize reduction rotating speed and increase torque.Other embodiment can also use different numbers The middle transition wheel of amount, form and specification.

Fig. 7 A to Fig. 7 B show 25 embodiment of thumb wheel clutch.Thumb wheel clutch 25 is used to execute clutch function, It includes thumb wheel 250 and thumb wheel resetting-mechanism 255.As shown in Figure 7 B, thumb wheel 250 includes input gear 251, is engaged to the The output section of two transition wheels 24, to receive power.Thumb wheel 250 further includes the fixed arc for being attached at 251 upside of input gear Thumb wheel head 252 is arranged to rotate together with input gear 251, to push and against adjacent clutch discs component 33, to drive Dynamic clutch discs component 33 is meshed with output rack 34.Thumb wheel 250 further includes fixed group for being attached at 251 downside of input gear Bar gear 253 is arranged to rotate together with input gear 251, to be engaged to the thumb wheel reset machine for being located at 250 lower section of thumb wheel Structure 255, as shown in Figure 7 A.

With continued reference to Fig. 7 B, thumb wheel resetting-mechanism 255 includes fixed block 256 and the sliding block 257 with rack, wherein fixed Block 256 is equipped with linearly extended guide rail, and sliding block 257 is equipped with the groove with guide rail complementation.It is sliding by the cooperation of groove and guide rail Block 256 can slide on fixed block 257.Since the rack positioned at 257 side of sliding block is engaged with aforementioned driving lever gear 253, make The linear sliding motion for obtaining sliding block 257 can be associated with each other with the rotational motion of driving lever gear 253.

Particularly, thumb wheel resetting-mechanism 255 can also include two tension springs S1 and S2, be located at sliding block 257 Both sides and between sliding block 257 and an end wall of fixed block 256.Two springs S1 and S2 are pre-set in sliding block 257 both sides apply the pulling force that size is identical and direction is opposite respectively, can be with as a result, when sliding block 257 is not by other external force It is maintained at equilbrium position.Moreover, two springs S1 and S2, which can be sliding block 257, applies an elastic-restoring force, sliding block 257 is made to have Return back to the trend of initial rest position.Preferably, the specification of two spring S1 and S2 is identical, and equilbrium position is located at solid as a result, Determine the centre position of block 256.Other kinds of spring or arrangement also can be used in those skilled in the art, as long as can be to slide Block applies an elastic-restoring force.As a result, when the driving lever gear 253 of thumb wheel 250 driving sliding block 257 slide when, sliding block 257 can with gram Take the restoring force of spring S1 and S2；When the driving lever gear 253 of thumb wheel clutch 250 does not drive sliding block 267 to slide, spring S1 Sliding block 262 can be actuated with the elastic-restoring force of S2 and is returned to initial rest position, then actuate the rotation of driving lever gear 253, with Thumb wheel 250 is set also to return back to initial position.

Magnet steel wheel assembly 22 is described with reference to Figure 10 A to Figure 10 C.In embodiment, magnet steel wheel assembly 22 is for continuing The power against clutch wheel disc component 33 is provided for thumb wheel clutch 25.As shown in Figure 10 C, magnet steel wheel assembly 22 includes metal Enclose gear 221, magnet steel wheel 222, torsional spring 223 and magnet steel axle tooth 224.Power input unit 10 will by the first output transition wheel 21 Power is transmitted to the magnet steel axle tooth 224 of magnet steel wheel assembly 22, and magnet steel axle tooth 224 drives magnet steel wheel by the torsion of torsional spring 223 222 rotations, under eddy current effect, quoit gear 221 can rotate along the direction of rotation of magnet steel wheel 222, then pass through First Transition wheel 23, the second transition wheel 24 transmit rotating force to thumb wheel clutch 25.Under 11 energized state of motor, magnet steel The quoit gear 221 of wheel assembly 22 exports rotary force always, to ensure that thumb wheel clutch 25 can be for clutch wheel disc component 33 It provides lasting against power.In embodiment, the aluminium circle gear of high magnetic conduction can be used in the quoit gear 221, can also adopt With copper band gear.22 structure fabrication of magnet steel wheel assembly is simple, and magnet steel wheel 222 drives quoit gear 221 to revolve by eddy current effect Turn, it is small with respect to driving force between the two.

Fig. 4 shows output gear train 30 accoding to exemplary embodiment, is operable as the dynamic of power input unit 10 Power is transferred to drawer to be driven outward.Output gear train 30 includes being made of sliding mechanism 31, the second output transition wheel 32 Output gear component and clutch wheel disc component 33.Rotation is transferred to clutch wheel disc component 33 by output gear component.Specifically, Sliding mechanism 31 is engaged with worm gear 13, and power is transferred to the second output transition wheel 32, is then transferred to clutch wheel disc component 33 Input unit.

Fig. 8 A and Fig. 8 B respectively illustrate assembling and the decomposition view of clutch wheel disc component 33.Clutch wheel disc component 33 includes Clutch wheel disc 331 is used to rotationally support third output transition wheel 332 and output gear 333.As shown, castle wheel Disk 331 is the semi-enclosed box body with internal chamber formed by upper cover, lower cover and side cover, 332 He of third output transition wheel Output gear 333 is arranged in the chamber interior.Also, the side cover of clutch wheel disc 331 has the profile with arc thumb wheel head 252 The surface of the profile to match so that clutch wheel disc 331 can deviate under the promotion of arc thumb wheel head 252.Third exported Ferry boat 332 can receive the power from the second output transition wheel 32, and then be transferred to output gear 333.According to castle wheel Whether disk 331 deviates, and output gear 333 can be selectively engaged to output rack 34, to which drive rack 34 carries out translation fortune It is dynamic, to drive and export the translation of the drawer (not shown) of 34 one of rack.In additional embodiment, the castle wheel of other shapes The shape (such as tabular) of disk 331 is also feasible.

In the illustrated embodiment, the upper lid of clutch wheel disc 331 is equipped with raised fixed column, thereon nested third spring S3 The other end of one end, third spring S3 is attached to outer housing or other fixed components.Third spring S3 can be clutch wheel disc 331 apply a spring-return power, with resist arc thumb wheel head 252 against power, so that clutch wheel disc 331 is had and return back to balance The trend of position.Third spring S3 can be helical spring, and be provided only at 331 upper cover of clutch wheel disc.But this practicality is new Type is without being limited thereto, and those skilled in the art can change type, position and quantity of third spring S3 etc. as needed, as long as its energy Enough it is that clutch wheel disc 331 applies spring-return power.

The transmission of power may be implemented in sliding mechanism 31 in output gear train 30, it may also be ensured that automatic switch drawer machine Structure protects motor 11 to exempt from damage when by external impacts.As shown in Figure 11 A to Figure 11 E, beaten used by the utility model Sliding mechanism 31 is by skidding axis tooth 311 and beats pulley sheet 312 and forms, and skidding axis tooth 312 is equipped with multiple elastic cantilevers, cantilever end Equipped with bulge-structure, which is suitable for engaging with the splined section beaten on 312 inner wall of pulley sheet.When normal operation, It skidding axis tooth 311 and beats pulley sheet 312 and is in meshing state, the two is with respect to remains stationary.When mechanism is by external force, Skidding axis tooth 311 and moment is beaten between pulley sheet 312 by strong relative rotation power, because of leading for cantilever protrusion and wheel piece inner wall spline To forcing the inside elastic shrinkage of cantilever, meshing state to be broken, skidding axis tooth 311 and beat between pulley sheet 312 opposite rotation occurs Transhipment is dynamic.When external force disappears, cantilever is sprung back under elastic-restoring force, and end bosses structure still and beats 312 inner wall of pulley sheet Spline engagement.

Figure 12 A to Figure 12 F show the unidirectional sliding mechanism of the prior art.The protrusion knot of cantilever design outer end on pawl The chamfering on structure both sides is inconsistent, to realize unidirectional skidding function.As shown in Figure 12 F, 45 ° of 1 ＞ of skidding angle [alpha] of pawl ＞ α 2, skidding angle [alpha] 1 ' ＞, 45 ° of ＞ α 2 ' on corresponding ratchet, due to mutually matched relationship, 1 ' angle phases of α 1 and α Match, preferably angle is equal；Same 2 ' angles of α 2 and α match, and preferably angle is equal.When electrical power, transition is exported Wheel transmits rotating force on pawl, and pawl is in ratchet when clockwise movement, and since α 2 is relatively small, α 2 ' is equally relatively Small, the skidding power between pawl-and-gearing is more than torsion, the two energy synchronous rotary passing power；When motor counter motion, pawl In ratchet when counterclockwise movement, since α 1 is relatively large, α 1 ' is same relatively large, and the skidding power between pawl-and-gearing is small In torsion, the two generates skidding, loses the function of motor reversal passing power.

Different from the unidirectional sliding mechanism of the prior art, sliding mechanism can realize two-way beat used by the utility model It is sliding.When motor forward or reverse provides power, skidding axis tooth upper cantilever projection portion angle beta 1, the angle beta of the single slot of spline 2, to ensure that sliding mechanism forward or reverse skidding power is consistent, two angle central symmetries.In the case that other conditions are constant, β 1 is big In β 2, skidding power is smaller, can be used in the product that torque demand is small when product normal use；β 1 is less than β 2, and skidding power is larger, can When for product normal use in the big product of torque demand.This sliding mechanism is simple in structure, it is only necessary to by adjusting β 1 and β The matching relationship of 2 angles, in the product component that just can be suitably used for various torque requirements.It can be in power using two-way sliding mechanism The protection to motor can be achieved when input unit forward or reverse, and two-way slipping torque is identical.More traditional sliding mechanism, this reality It is strong with the pawl contractility of novel sliding mechanism, reset positioning reliably, slipping torque is stablized, using symmetric design structure letter It is single, while also greatly reducing Mold Making difficulty.

Referring again to FIGS. 1, the working method of description automatic switch drawer mechanism.Electrode 11 rotates forward or backwards, and passes through Rotational power is exported by worm screw 12 and worm gear 13.At worm gear 13, the following two paths of power point are transmitted.In first path, I.e. in output gear train 30, power is transferred to clutch wheel disc component 33 via output gear component.Specifically, power transmits Onto sliding mechanism 31, sliding mechanism 31 transfers power to the second output transition wheel 32 again, and via the second output transition wheel 32 power are transferred to the output transition 332 of the third in clutch wheel disc component 33, which drives output gear 34 constantly rotate.In the second path, i.e., in clutch tooth train 20, power is transferred to thumb wheel via clutch gear component Clutch.Specifically, power is transferred to the first output transition wheel 21, and magnet steel wheel group is driven by the first output transition wheel 21 The magnet steel axle tooth 224 of 22 lower part of part rotates, and magnet steel axle tooth 224 drives magnet steel wheel 222 with equal uniform velocity by torsional spring 223 Rotation, then, magnet steel wheel drive quoit gear 221 to rotate by eddy current effect, the output rotation of quoit gear 221.Institute is defeated The rotation gone out is transmitted to the input gear 251 of thumb wheel clutch 25 after slowing down via First Transition wheel 23, the second transition wheel 24.

Be rotation and reset using thumb wheel clutch in the characteristics of automatic switch drawer mechanism of utility model and Realize automatic running and the stopping of refrigerator switch drawer mechanism.

When motor 11 is powered, arc thumb wheel head 252 is under the driving of power transmissioning part 10 towards clutch wheel disc component 33 Deflection, while overcoming the pulling force of third spring S3 nested with fixed column on clutch wheel disc component 33, such as Fig. 5 A to Fig. 5 B institutes Show.In the energized state, the constant velocity rotation of magnet steel wheel assembly 22 is that thumb wheel clutch 25 provides a constant rotation retentivity, Arc thumb wheel head 252 is held against with clutch wheel disc component 33, so that it is guaranteed that the output in clutch wheel disc component 33 Gear 333 is mutually tightly engaged with external output rack 34, to realize power output.Output rack 34 drives as a result, The drawer being integral therewith does straight reciprocating motion, to realize that control drawer is automatically turned on or closed.In Fig. 5 A to Fig. 5 B institutes Under the energized state shown, thumb wheel clutch 25 remains stationary, retentivity under the active force of magnet steel wheel assembly 22 provide defeated Go out gear 333 and exports the engagement force between rack 34；Thumb wheel resetting-mechanism 26 is also equal under the active force of magnet steel wheel assembly 22 Remains stationary, the first spring S1 and second spring S2 are deformed and are stored potential energy.When rack 34 by unexpected outer force effect (such as Artificially to the thrust of drawer or pulling force) when, and external force is more than thumb wheel retentivity, then thumb wheel clutch 25 can be flicked, to The connection for cutting off output gear 333 and rack 34, to protect motor 11.

When motor 11 powers off, the eddy current effect in magnet steel wheel assembly 22 disappears, and is applied by magnet steel wheel assembly 22 constant Retentivity disappears.Reset power is served as in the potential energy release that the first and second spring S1 and S2 in thumb wheel resetting-mechanism 26 are stored Source.First spring S1 and second spring S2 is returned to initial equilibrium conditions, and band 262 reduction of spondylolisthesis of movable slider then drives thumb wheel The revolution of clutch 25 is reset to the state as shown in Fig. 6 A to Fig. 6 B.At this point, clutch wheel disc component 33 is in fixed column nesting Also revolution resets under the return action of third spring S3 so that output gear 333 is disengaged from outside output rack 34, refrigerator Drawer stops automatic opening or closing function, at this time, it can be achieved that manually opened or closing refrigerator drawer.

The variation of the elastic force of three springs S1, S2 and S3 with the rotation angle α of thumb wheel 250 is described with reference to Fig. 9.When When output gear 333 and output rack 34 engage, the rotational angle of thumb wheel 250 is α 1, as shown in Figure 5 B；When output gear 333 When being detached from output rack 34, the rotational angle of thumb wheel 250 is 0, as shown in Figure 6B.When the rotational angle of thumb wheel 250 is 0, the The starting force of one spring S1 and second spring S2 is F12 '；When thumb wheel 250 rotates to α 1, the first spring S1 or second spring S2's Spring force is F12, and the spring force of third spring S3 is F3.As shown in figure 9, when thumb wheel rotates counterclockwise, second spring S2's Spring force is linearly increasing to F12 ' with thumb wheel angle, and the spring force of third spring S3 is linearly increasing to also with thumb wheel angle F3.F12 ', which can be greater than or equal to 0, F3, can be more than 0, F12 and F3 without relativeness.When trackwheel 250, transition wheel 24, which are applied to power on thumb wheel 250, should be more than the summation of F12 and F3.In normal operating condition, clutch wheel disc 331 can be to thumb wheel 250 apply a lasting reverse rotational force, and angle [alpha] is bigger, and reverse rotational force is smaller.But thumb wheel 250 can be by card when α is equal to 180 ° Extremely, it is advantageous to 165 ° of 180 ° of 1 ＜ of ＜ α.

The automatic switch drawer mechanism of the utility model uses thumb wheel clutch.The mechanical stability of thumb wheel clutch Height, and the process of clutch wheel disc component is slow and torque gradually increases against pushing for arc thumb wheel head.By using rational design Thumb wheel corner α and arc thumb wheel head cam face form so that output gear on clutch wheel disc component with it is external It exports rack engagement force since 0 gradually to increase, to avoid output gear from engaging generation directly punching before with output rack It hits.Meanwhile three springs are separately mounted on thumb wheel clutch and clutch wheel disc component, can be applied always certain initial Position retentivity, so as to so that mechanism even running while meeting transmission agency, can also prevent thumb wheel clutch and Clutch wheel disc component generates malfunction when by in-house out-of-balance force.

Exporting the displacement of the straight reciprocating motion of rack can be supervised by position sensor (such as Hall element) It surveys.When drawer is opened to desired locations, position sensor transmits signal to master control borad, powers via master control borad cut-out motor, Drawer positions are in hold mode.When needing drawer reset to close, operation master control borad can driving motor reverse rotation realization pumping Drawer, which resets, closes, and realizes that drawer closing is tight by the position sensor of reset close side monitoring position.

Automatic switch drawer mechanism can be provided with multiple sensors, detect drawer open or closed position and electricity respectively The rotating speed of machine.Work as electrical power, drawer is in normally-open or closing process, if it is artificial intervene manually pull open by force or When closing drawer, in external force back transfer to sliding mechanism, skidding axis tooth and wheel sector-meeting of skidding are skidded, and ensure that external force will not It is transmitted to power input unit, motor can be protected.If sliding mechanism fails, motor is increased by external force stall, electric current, After the current of electric safe threshold set by automatically controlled mainboard, power supply is automatically cut off.At this point it is possible to manually to refrigerator drawer into Row opens and closes.In addition, the utility model, which can also be achieved the mechanism after intervening external force and removing, is again introduced into what early period did not completed Automatic operating state fully opens or closed position, power input unit are just stopped until refrigerator drawer is in.

Most preferred embodiment and some other embodiment for realizing the utility model are described in detail above, but answers Understand, the effect of these embodiments is only that citing, and do not lie in limit in any way the scope of the utility model, it is applicable or Construction.The scope of protection of the utility model is limited by appended claims and its equivalent way.Those skilled in the art can be Many changes are made to foregoing embodiments under the introduction of the utility model, these changes each fall within the protection model of the utility model It encloses.

Claims (12)

1. a kind of automatic switch drawer mechanism, which is characterized in that the mechanism includes：

Thumb wheel clutch (25) comprising thumb wheel (250) and thumb wheel resetting-mechanism (255)；

Clutch wheel disc component (33) comprising output gear (333) and output gear resetting-mechanism；

Rack (34) is exported, is fixedly attached to drawer, and suitable for engaging the output gear (333)；

Power input unit (10) comprising motor (11), to export rotation driving force；

When the motor (11) are powered, the output gear (333) is driven to continuous rotation, also, the thumb wheel (250) It is driven to turn over an angle, be deviated towards the output rack (34) with stirring the output gear (333) so that described defeated Go out gear (333) to engage with the output rack (34), to the mobile rack (34) and opens or closes the drawer；

When the motor (11) power off, the thumb wheel (250) reversely turns under the action of thumb wheel resetting-mechanism (255) The angle, also, the output gear (333) deviates from the output rack under the action of output gear resetting-mechanism (34) it deviates so that the output gear (333) is detached from the output rack (34), to stop moving the rack (34) And stop opening or closing the drawer.

2. automatic switch drawer according to claim 1 mechanism, which is characterized in that

The thumb wheel (250) includes input gear (251), arc thumb wheel head (252) and driving lever gear (253), wherein described defeated Enter gear (251) and receive driving force, the arc thumb wheel head (252) and the driving lever gear (253) are with the input gear (251) it rotates together；

Wherein, the arc thumb wheel head (252) has the first cam surface, first cam surface and the clutch wheel disc component (33) corresponding second cam surface cooperation, so that with the rotation of the arc thumb wheel head (252), the output gear (333) engagement force between the output rack (34) gradually increases.

3. automatic switch drawer according to claim 2 mechanism, which is characterized in that

The thumb wheel resetting-mechanism (255) includes fixed block (256), the sliding block (257) with rack, the first spring (S1) and second Spring (S2), wherein the sliding block (257) with rack fits along the past polyslip of the fixed block (256), also, described First spring (S1) and the respective one end the second spring (S2) are attached to the side of the sliding block (257), and its other end It is fixed to the fixed block (256)；

When the motor (11) are powered, the rotation of the driving lever gear (253) drives the sliding block (257) from initial bit horizontalization Holding position is moved to, meanwhile, the translation of the sliding block (257) promotes first spring (S1) and the second spring (S2) bullet Property deformation；

When the motor (11) power off, first spring (S1) and second spring (S2) drive the sliding block (257) from institute It states holding position and moves to the initial position, meanwhile, driving lever gear (253) described in the driven in translation of the sliding block (257) is anti- To rotation.

4. automatic switch drawer according to claim 1 mechanism, which is characterized in that

The clutch wheel disc component (33) includes clutch wheel disc (331), third output transition wheel (332) and output gear (333), Wherein, the output gear (333) and the third output transition wheel (332) are rotatably supported at the clutch wheel disc (331) it on and keeps being engaged with each other,

Wherein, the clutch wheel disc (331) can surround the shaft rotation of the third output transition wheel (332), described in drive Output gear (333) is deviated towards or away from the output rack (34)；

Wherein, the side wall of the clutch wheel disc (331) is equipped with the second cam surface, second cam surface and the thumb wheel (250) the corresponding first cam surface cooperation on so that with the rotation of the thumb wheel (250), the output gear (333) with Engagement force between the output rack (34) gradually increases.

5. automatic switch drawer according to claim 4 mechanism, which is characterized in that

The output gear resetting-mechanism includes third spring (S3), and one end of the third spring (S3) is nested in the clutch In the fixed column of wheel disc (331), other end holding is relatively fixed；

When the motor (11) are powered, the clutch wheel disc (331) is under the stirring of the thumb wheel (250) towards the output Rack (34) deviates, while overcoming the spring force of the third spring (S3)；

When the motor (11) power off, the third spring (S3) drives the clutch wheel disc (331) far from the output gear Item (34) deviates.

6. automatic switch drawer according to claim 1 mechanism, which is characterized in that the rotational angle of the thumb wheel (250) More than 165 ° and it is less than 180 °.

7. automatic switch drawer according to claim 5 mechanism, which is characterized in that

The power input unit (10) further includes worm screw (12) and worm gear (13), and the motor (11) is driven via the worm screw (12) Dynamic worm gear (13) rotation, with output driving power.

8. automatic switch drawer according to claim 7 mechanism, which is characterized in that

Automatic switch drawer mechanism further includes magnet steel wheel assembly (22), and the magnet steel wheel assembly (22) includes magnet steel axle tooth (224), torsional spring (223), magnet steel wheel (222) and quoit gear (221)；

The motor (11) drives magnet steel axle tooth (224) rotation, the magnet steel axle tooth (224) to pass through the torsional spring (223) magnet steel wheel (222) is driven to be rotated with equal uniform velocity, the magnet steel wheel (222) is the metal by eddy current effect It encloses gear (221) and applies a constant rotary force；

Under the action of the rotary force, the quoit gear (221) drives the thumb wheel (250) to turn over the angle, and And the thumb wheel (250) is caused constantly to be pressed against the clutch wheel disc component (33), to maintain the output gear (333) With the engagement force between the output rack (34).

9. automatic switch drawer according to claim 8 mechanism, which is characterized in that

The rotation of the worm gear (13) is transferred to the magnet steel axle tooth (224), also, institute via the first output transition wheel (21) The rotation for stating quoit gear (221) slows down via at least level-one transition wheel (23,24) and is transferred to the thumb wheel (250).

10. automatic switch drawer according to claim 9 mechanism, which is characterized in that

Automatic switch drawer mechanism further includes two-way sliding mechanism (31), and the two-way sliding mechanism (31) includes skidding axis Tooth (311) and beat pulley sheet (312), wherein the outer wall of the skidding axis tooth (311) is equipped with multiple elastic cantilevers, each bullet Property cantilever end be equipped with symmetrical structure protrusion, the inner wall for beating pulley sheet (312) be equipped with matches with the convex shape The spline of the symmetrical structure of conjunction；

In normal operation, thus the protrusion and the spline engagement skidding axis tooth (311) and described beat pulley sheet (312) it is in meshing state；

When by external force forward or backwards, the skidding axis tooth (311) and the moment strong phase between beating pulley sheet (312) The inside elastic shrinkage of the elastic cantilever is forced to rotary force so that the protrusion is detached from the spline, the thus skidding Axis tooth is detached from pulley sheet is beaten.

11. automatic switch drawer according to claim 10 mechanism, which is characterized in that

The rotation of the worm gear (13) be transferred to it is described beat pulley sheet (312), then be transferred to the via the skidding axis tooth (311) Two output transition wheels (32), second output transition wheel (32) drives third output transition wheel (332) rotation, with driving Output gear (333) rotation.

12. a kind of refrigerator, which is characterized in that include the automatic switch drawer according to any one of preceding claims 1-11 Mechanism.