CN2174300Y - Clutch for electric screwdriver - Google Patents

Abstract

The utility model relates to a clutch for an electric screwdriver. The top surface of a power wheel is orderly provided with a plurality of grooves, one side of the interior of the grooves is provided with a shallow slot, the other side of the interior of the grooves is provided with a deep slot, and a slant face is arranged between the shallow slot and the deep slot. The top part of the grooves is provided with a roller and steel balls. When screw nails are screwed off, because of the contrary steering of the screw nails, the steel balls of the clutch is pressed to the other side by the roller, when the roller rotates reversely, when the crown elevation of the roller is pressed about 15%, and thus, the torsion for screwing off the screw nails is forever larger over 15% than that for screwing in the screw nails. The electric screwdriver of the utility model can be simultaneously suitable for screwing in or screwing off the screw nails.

Description

Clutch for electric screwdriver

The utility model relates to a kind of clutch of electric screw driver, mainly provides a kind of electric screw driver that can screw or unscrew screw on the object that is useful in simultaneously.

Because making rapid progress of industrial technology, many in the past need be by the chain drive and the instrument of manpower, nowadays most all available motor tools replace, and electric screw driver is a kind of tangible example, the screwdriver of which kind of pattern no matter in the past will unscrew or when screwing screw, all must reverse with manpower and carry out, yet, can replace manpower and a kind of laborsaving and instrument easily is provided at present with power-actuated bottle opener;

For this electric screw driver can be used, be equipped with a clutch apparatus again under safe condition,, prevent that motor from producing overheated bad phenomenon so that torque value when excessive, makes the motor brake rapidly;

As shown in Figure 5, the driving part of existing electric screw driver mainly is to form an axis hole B in housing A central authorities, axis hole B side then is formed with through hole C, housing A side is formed with grooving again, which is provided with an Isolating Switch D, this housing A end face then is provided with a drive E, also is formed with corresponding axis hole on the drive E, under the normality, this drive E is close to the end face of housing A, and suppress the contact that this Isolating Switch D projects upwards, and make its home loop be the open circuit shape, housing A inside then is provided with a power wheel F by the motor driving, power wheel F central authorities are formed with jack, in order to the plant drive link, its inside also is provided with train of reduction gears, in order to promote output torque;

Power wheel F end face side is formed with an arc groove G again, this arc groove G is provided with roller H, and be inserted with a fore-set I and steel ball J(in the through hole C of housing A respectively) referring to Fig. 6, under normal conditions, roller H on this drive F is limited by corresponding steel ball J, when torsion did not reach the setting restriction, the unlikely fore-set H top pushing tow that is subjected to of steel ball J made to be subjected to the Isolating Switch D of drive E compacting still to keep original state;

When the suffered torque value of this electric screw driver is excessive, as shown in Figure 7, promptly cause the whole turn thereupon of this power wheel F, so the roller H on it promptly moves to the steel ball J in the corresponding pushing tow housing A through hole C, promotes this fore-set I and protrudes in housing A end face and back down drive E, after this drive E is boosted, Isolating Switch D just removes and neutralizes, and its inner contact is the conducting shape, by a control circuit motor is shut down, and obtains to exceed the braking effect of torque range;

Yet the die clutch construction of above-mentioned existing electric screw driver has its shortcoming, because of the main function of electric screw driver is to be anchored on screw on the object and to dismantle screw from object, because said structure is at holding screw or when tearing screw open, the electric screw driver torque value that both are produced when DRIVE SCREWS or back-out screw is all equal, single holding screw is more or less freely to the object, but when from object, screwing out screw, often (combine comparatively fastening between coping screw and object because of the bigger torque value of needs, and friction is bigger), so to screw in and to screw out the screwdriver that screw has identical torque value, required bigger torque value in the time of can't being fit to screw out screw in fact, often make this electric screw driver when screwing out screw, often generation can't screw out screw smoothly, thereby cause electric screw driver to be not suitable for practical situation, therefore, the practicality of the clutch of existing electric screw driver is not good, and the necessity that is improved is arranged.

Main purpose of the present utility model is: the clutch that a kind of electric screw driver is provided, mainly be to be provided with a plurality of grooves successively at the power wheel end face, inside grooves one side is a shallow slot, side is a deep trouth in addition, and between between shallow slot and deep trouth, form an inclined-plane, groove top is provided with roller and steel ball, the utility model will be when object unscrews screw and uses, because switched in opposite, can make the steel ball of clutch be pressed onto another side by roller, make roller when counter-rotating, oppressed when rising about 15% height, then electric screw driver when unscrewing screw forever when locking screw greater than 15% torsion, so can make electric screw driver of the present utility model that the different torque values that screw or unscrew screw on the object can be provided simultaneously, except that being easy to machining, the life-span of clutch is used than general tradition and protrudes step mode long number more than ten times in the use, when the clutch escape, vibration and stability also improve a lot of simultaneously.

The clutch of the electric screw driver that the utility model provides, be to form a fit slot at an inner housing end face, so that be used for and bottle opener front end part fit, this fit slot bottom center formation one runs through the axis hole of inner housing, in order to wear transmission shaft lever, the inherent axis hole periphery of this fit slot is with equal angles again, form many group circular holes, also be equipped with steel ball on it, and also being provided with a drive in this fit slot, these drive central authorities are provided with a transmission shaft lever, and are formed with a short slot on the wall of fit slot, this short slot is provided with an ear induction Isolating Switch suddenly

Inner housing inside is provided with a power wheel, be provided with bearing and train of reduction gears in this power wheel, and its central power transmission shaft is by the transmission of motor institute, again through the buffering of train of reduction gears, and required rotating speed and the moment of torsion of acquisition axostylus axostyle, this power wheel end face also forms the groove that many groups are symmetric arrays with isogonism, be respectively equipped with a roller on the groove, the angle of this groove and roller configuration is identical with circular hole in the fit slot, and this roller is not corresponding to circular hole under normal conditions, one helical spring is compressed on the drive top, and the helical spring top is compressed on a shell body inside, and make transmission shaft lever run through helical spring central authorities, and,, it is characterized in that so that screw or unscrew screw with transmission shaft lever by the outer projection of shell body mediad:

Aforementioned grooves is to form shallow slot with anticlockwise left side, the right side forms a deep trouth, between between shallow slot and deep trouth, form an inclined-plane, so that when unscrewing screw, make roller rise to the shallow slot position along the inclined-plane, steel ball is pressed onto the roller another side, drive is risen compressed spring simultaneously by the deep trouth position of groove, so that when unscrewing screw, can increase the torsion output valve of electric screw driver.

The utlity model has following advantage:

When electric screw driver of the present utility model unscrews screw on object, because after the counter-rotating of switched in opposite motor, make in the shallow slot of roller position groove, make the steel ball of clutch be forced into the another side position of roller, and design makes roller when counter-rotating, when being risen about 15% height by the shallow slot compressing, the torque value about about 15% of the torque value that then makes electric screw driver when tearing screw open during forever greater than holding screw, so can reach and be suitable for holding screw and the usefulness of tearing screw open simultaneously, the utility model is compared with existing electric screw driver, the utlity model has the enhancement on the effect.

Further specify architectural feature of the present utility model and purpose below in conjunction with accompanying drawing.

Brief Description Of Drawings:

Fig. 1 is a three-dimensional exploded view of the present utility model.

But Fig. 2 is the plane of electric screw driver rotary screw of the present utility model in object.

But Fig. 3 is the plane work sheet of electric screw driver rotary screw of the present utility model in object.

Fig. 4 is the plane of electric screw driver of the present utility model can screw out screw on object the time.

Fig. 5 is the exploded view of existing electric screw driver clutch.

Fig. 6, Fig. 7 are the floor map of existing electric screw driver clutch.

The utility model is a kind of clutch (as shown in Figure 1) of electric screw driver, can find out the drives structure of the utility model electric screw driver among the figure, be to form a fit slot 11 at an inner housing 10 end faces, so that be used for and bottle opener front end part fit, this fit slot 11 bottom center formation one runs through the axis hole 12 of inner housing 10, in order to wear transmission shaft lever 13, axis hole 12 peripheries of these fit slot 11 inboards form many group circular holes 14 with equal angles again, also be equipped with steel ball 15 on it, and also be provided with a drive 20 in this fit slot 11, these drive 20 central authorities are provided with a transmission shaft lever 13, and being formed with a short slot 16 on the wall of fit slot 11, this short slot 16 is provided with an Isolating Switch or ear induction Isolating Switch 17 suddenly;

Inner housing 10 inside are provided with a power wheel 30, (this structure is existing member to be provided with bearing and train of reduction gears in this power wheel 30, and non-characteristic members of the present utility model, do not repeat them here, and its central power transmission shaft is by the transmission of motor institute, again through the buffering of train of reduction gears, and obtain required rotating speed and the moment of torsion of axostylus axostyle; These power wheel 30 end faces also form many groups with isogonism and are the groove 31 that symmetry shape is arranged, its characteristic is to be: this groove 31 is for forming shallow slot 32 with anticlockwise left side, the right side forms a deep trouth 33, form an inclined-plane 34 between shallow slot 32 and 33 in deep trouth, and be respectively equipped with a roller 35 on this groove 31, wherein the angle of this groove 31 and roller 35 configurations is identical with circular hole 14 in the fit slot 11, and this roller 35 is not corresponding to this circular hole 14 under normal conditions;

One helical spring 40, be compressed on drive 20 tops, and helical spring 40 tops are compressed on the part of a shell body 50 inside, and make transmission shaft lever 13 run through the central authorities of helical spring 40, and by the outer projection of shell body 50 mediads, so that screw or unscrew screw, reach fastening or unscrew the purpose of screw in object with transmission shaft lever 13.

Fig. 2 illustrates the utility model electric screw driver DRIVE SCREWS and each the member assembled state under normality in object, the steel ball 15 in the fit slot 11, on the circular hole 14 wherein, its bottom is to protrude in inner housing 10 inside, and drive 20 is positioned at steel ball 15 upper ends, and the roller 35 on the power wheel 30 then is the state that staggers with steel ball 15; This electric screw driver is under normal operation, and the composition of each member promptly as previously mentioned; Electric screw driver is finished when screwing screw, power wheel 30 torsion strengthen, after it surpasses a setting value, power wheel 30 integral body are clockwise direction rotation simultaneously also, roller 35 on this groove 31 is to be positioned on deep trouth 33 positions at this moment, and through rotating to corresponding to circular hole 14 places, thereby pushing tow steel ball 15, cause and pass drive 20, make drive 20 form a displacement action (as shown in Figure 3), this displacement action is about to this signal and transfers to motor by Isolating Switch or after ear induction Isolating Switch 17 detects suddenly, makes the motor brake.

Fig. 4 illustrates electric screw driver and screw out screw and each the member assembled state under normality in object, wherein in the fit slot 11, steel ball 15 on the circular hole 14, its bottom also is outstanding inner housing 10 inside, drive 20 is positioned at steel ball 15 upper ends, and the roller 35 on this power wheel 30, because when unscrewing screw, switched in opposite during the turning to and screw of motor, so after the motor counter-rotating, 35 of rollers by in the groove 31 by deep trouth 33 along the inclined-plane 34 and rise to shallow slot 32 places, the shallow slot 32 that 35 of rollers are positioned at groove 31 is the state that staggers with steel ball 15, make the steel ball 15 of clutch be urged to roller 35 another sides, make roller 35 when counter-rotating, steel ball 15, drive 20 rises to shallow slot 32 positions because of roller 35 by the deep trouth 33 of groove 31, and produce a bit of displacement (about 0.3c.m), this displacement is determined by the difference in height between shallow slot and deep trouth, but still deficiency is so that Isolating Switch 17 is sensed this displacement, be that deficiency is so that motor produces the situation of outage, so steel ball 15, drive 20 can be by designing oppressed about 15% the height of rising in back, make this moment helical spring 40 be out of shape compression by top on the drive 20, then when electric screw driver of the present utility model is unscrewing screw during forever than holding screw greater than about about 15% torsion output, so do not cause electric screw driver of the present utility model when unscrewing screw, producing because of torque value is too small can't the turn screw.

Claims (1)

1, a kind of clutch of electric screw driver, be to form a fit slot at an inner housing end face, so that be used for and bottle opener front end part fit, this fit slot bottom center formation one runs through the axis hole of inner housing, in order to wear transmission shaft lever, the inherent axis hole periphery of this fit slot is with equal angles again, form many group circular holes, also be equipped with steel ball on it, and also being provided with a drive in this fit slot, these drive central authorities are provided with a transmission shaft lever, and are formed with a short slot on the wall of fit slot, this short slot is provided with an ear induction Isolating Switch suddenly

Inner housing inside is provided with a power wheel, be provided with bearing and train of reduction gears in this power wheel, and its central power transmission shaft is by the transmission of motor institute, again through the buffering of train of reduction gears, and required rotating speed and the moment of torsion of acquisition axostylus axostyle, this power wheel end face also forms the groove that many groups are symmetric arrays with isogonism, be respectively equipped with a roller on the groove, the angle of this groove and roller configuration is identical with circular hole in the fit slot, and this roller is not corresponding to circular hole under normal conditions, one helical spring is compressed on the drive top, and the helical spring top is compressed on a shell body inside, and make transmission shaft lever run through helical spring central authorities, and,, it is characterized in that so that screw or unscrew screw with transmission shaft lever by the outer projection of shell body mediad:

Aforementioned grooves is to form shallow slot with anticlockwise left side, the right side forms a deep trouth, between between shallow slot and deep trouth, form an inclined-plane, so that when unscrewing screw, make roller rise to the shallow slot position along the inclined-plane, steel ball is pressed onto the roller another side, drive is risen compressed spring simultaneously by the deep trouth position of groove, so that when unscrewing screw, can increase the torsion output valve of electric screw driver.

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