CN203738684U - Impact screwdriver - Google Patents

Abstract

The utility model provides an impact screwdriver which comprises a machine shell, a battery arranged in the machine shell, a motor arranged in the machine shell, a transmission portion and an impact portion. The transmission portion and the impact portion are driven by the motor, the motor is provided with a driving shaft providing rotating output, the transmission portion slows down the rotating output of the driving shaft and then performs rotating output, and the impact portion comprises a hammer, a hammer anvil matched with the hammer and impacted by the hammer, and an output shaft driven by the hammer anvil to rotate. The impact screwdriver is characterized in that the nominal voltage of the battery is smaller than or equal to 4.25 V, the impact frequency of the hammer and the hammer anvil is larger than 30 Hz, and the ratio of the output torque (measured as Nm) of the output shaft to the nominal voltage of the battery is 1.8 to 4.5. According to the impact screwdriver, the low voltage high output torque can be achieved, the structure is compact, operation can be performed in the common site and narrow and small space, and a user can conveniently carry and use the screwdriver.

Description

Impact screwdriver

Technical field

The utility model relates to a kind of hand held electric tool, particularly a kind of impact screwdriver.

Background technology

The advantages such as screwdriver is a kind of family common tool, and it has fast light, cheap practicality, the crowd that is suitable for is extensive.Normal screws criticizes that the restriction due to its outputting torsion in the course of the work often can not be squeezed into screw completely or overexertion easily causes sliding tooth, this has just brought the unnecessary duplication of labour or has been avoided sliding tooth to increase the step of switching hand-operated tools, causes that work is loaded down with trivial details and user experience is poor.

In this case, conventionally need to use the impact screwdriver that is attached with impact function, in the time tightening screw, under the driving of motor, the output shaft of impact screwdriver applies circumferential hitting power according to predetermined rhythm to this screw like this, thereby has improved operating efficiency.But for DIY user, on market, existing impact screwdriver is because its expensive price causes audient not high.In addition, because the operating mode running in instrument use procedure is of all kinds, common impact screwdriver, because volume is larger, is often difficult to be competent at completely in narrow and small working space, and the screwdriver of small volume is because the lower output torque of voltage not still cannot meet user's demand.

Summary of the invention

The purpose of this utility model has been to provide the impact screwdriver of the high output torque of a kind of low-voltage and compact.

In order to address the above problem, the utility model provides a kind of impact screwdriver, comprise casing, be arranged on the battery in casing, be positioned at the motor of casing inside, by motor-driven running part and impact part, described motor has a driving shaft that rotation output is provided, rotation output after described running part slows down the rotation output of described driving shaft, described impact portion is divided and is comprised hammer, match and merge the hammer anvil that is subject to its strike with described hammer, by the output shaft of hammer anvil driven rotary, it is characterized in that: the rated voltage of described battery is less than or equal to 4.25V, the striking frequency of described hammer and hammer anvil is greater than 30Hz, the outputting torsion (taking Nm) of described output shaft is 1.8 ~ 4.5 with the ratio of the rated voltage of described battery.

Further, the outputting torsion of described impact screwdriver is greater than 8Nm.

Further, described rated voltage is 3.6V.

Further, described hammer, hammer anvil and the output shaft that impacts part is metallic sintered products or accurate die casting, and described hammer anvil and output shaft can be individual part integrally formed or that be formed separately.

Further, described impact screwdriver also comprises an axle latch mechanism that described impact screwdriver can be switched between electric operating or manual operation.

Further, described axle latch mechanism comprises the first engaged element being installed on casing and can be connected at the operating parts operating between locked, with operating parts and is arranged on the second engaged element on output shaft, described the first engaged element have away from the primary importance of the second engaged element and under the drive of operating parts movement as for the second place engaging with the second engaged element.

Further, the outer surface of described the first engaged element has multiple projections, and described casing is provided with for the axially movable chute of the first engaged element, is formed with multiple grooves that can coordinate with described projection on the outer circumference surface of described the second engaged element.

Further, described operating parts can rotate relative to casing, and the outer surface of described the first engaged element is provided with skewed slot, and described skewed slot is provided with the axially movable pin of the first engaged element that can slide and impel under the rotarily driving of operating parts thereon.

Further, described axle latch mechanism also comprises an axle lock-switch being triggered by described operating parts, the break-make of motor circuit described in the control of described axle lock-switch.

Further, described battery is lithium battery.

Utilize impact screwdriver of the present utility model, can reach the high output torque of low-voltage and compact conformation, can operate at small space, be convenient to user and portably use.

Brief description of the drawings

Fig. 1 is the front view of the impact screwdriver in the utility model embodiment;

Fig. 2 is the cutaway view of the impact screwdriver in the utility model embodiment;

Fig. 3 is the decomposing schematic representation of the impact screwdriver in the utility model embodiment.

Detailed description of the invention

Further illustrate detailed description of the invention of the present utility model below in conjunction with accompanying drawing.

Refer to Fig. 1 to Fig. 3, impact screwdriver 10 in the utility model embodiment is similar to pistol-shaped, comprise casing 11, casing 11 comprises a cylindrical circular part (figure is mark not) substantially, divide the handle 12 of angled layout with this cylindrical part, and be arranged at the battery 13 of handle inside.Casing 3 has longitudinal axes L along the length direction of its cylindrical shape part, handle 12 is provided with the switch 14 for controlling machine startup, the interface portion of handle 12 and cylindrical shape part is also provided with commutation button 15, its both sides of being located at respectively casing 11 are for controlling the rotating of machine, handle inside is also provided with PCB control panel 16, be positioned at the front of battery 13, on PCB control panel 16, be integrated with electric weight display interface (not shown), can show intuitively instrument charge and discharge process, in addition, in machine, be also provided with charge and discharge protecting device (not shown), can protect discharging and recharging of complete machine, guarantee to use the working life of safety and machine.

Please refer to Fig. 2 and Fig. 3, taking on casing 11 away from the one end at handle 12 places as front end, the relative other end is rear end, along the longitudinal axis L be furnished with successively from front to back motor 17, the running part 18 that driven by motor 17 and impact part 19.Motor 17 has a driving shaft 171 that rotation output is provided, and the top of driving shaft 171 is provided with motor gear 171a, for the dynamic rotation output of motor 17 being passed to running part 18 by gear structure.Running part 18 is for rotation output after the rotation output of driving shaft 171 is slowed down, running part 18 comprises a gear-box 181, in gear-box 181, contain planetary gear reduction system 182, in embodiment of the present utility model, planetary gear reduction system 182 is primary speed-down systems, specifically comprise planetary gear 182a, planet carrier 182b and ring gear 182c, the setting that ring gear 182c is fixing with respect to gear-box 181, planet carrier 182b comprises columniform pedestal and the circumferential evenly spaced multiple planetary gear fulcrums (figure is mark not) that are arranged on pedestal end face, planetary gear fulcrum extends from pedestal rear end, a planetary gear 182a is installed on each planetary gear fulcrum, the driving shaft 171 of motor 17 extends in gear-box 181, engage with the planetary gear 182a being contained in wherein.

The pedestal of planet carrier 182b is provided with an endoporus, is fixedly connected with by interference fit with the jackshaft 191 that impacts part 19, and therefore jackshaft 191 is followed planet carrier 182b rotation all the time.Impacting part 19 comprises the hammer 192 that is installed on jackshaft 191, spring 193 between hammer 192 and planet carrier 182b and is positioned at and hammer 192 and the spin V-shaped groove beater mechanism (not shown) of jackshaft 191 joints into shape, to those skilled in the art, above-mentioned spin V-type groove beater mechanism is known technology, does not repeat.On hammer 192 front end face, radial symmetric convexes with a pair of the first end tooth 192a, and the front end of hammer 192 is also provided with hammer anvil 194, hammer anvil 194 with hammer 192 relative rear end faces into shape on the protrusion of radial symmetric be provided with a pair of the second end tooth 194a.Impact part 19 also comprises extends gear-box 181 front ends, is connected in the output shaft 195 of hammer anvil 194, is understandable that, hammer anvil 194 can be individual part integrally formed or that be formed separately with output shaft 195.Output shaft 195 front ends are provided with accepting groove 1951, can in the time realizing difference in functionality, accommodate corresponding working head.

The operation principle of impact screwdriver 10 in the utility model embodiment is described in detail in detail below, the driving shaft 171 of motor 17 rotates, motor gear 171a on driving shaft 171 drives the planetary gear 182a star-wheel fulcrum rotation of detouring, planetary gear 182a creeps along the internal tooth of the ring-type of ring gear 182c simultaneously, around axis (figure the is mark not) revolution of driving shaft 171.The revolution of planetary gear 182a drives the rotation of 182b planet carrier, and rotation is delivered on jackshaft 191, jackshaft 191 is by ball V-type groove beater mechanism, drive hammer 192 to move back and forth in the axial direction, jump bit anvil 194 under the effect of spring 193 simultaneously, impulsive force is passed to output shaft 195 the most at last, for those of ordinary skills, the operation principle of above-mentioned impact screwdriver 10 is known technologies, does not therefore repeat more.

Impact screwdriver 10 also comprises an axle latch mechanism 20 that impact screwdriver 10 can be switched between electric operating or manual operation, axle latch mechanism 20 comprises the operating parts 201 being installed on casing 11, the first engaged element 202 coordinating with operating parts 201, be arranged on the second engaged element 203 on output shaft 195 and control the axle lock-switch 204 of motor 17 connecting and disconnecting of the circuit, operating parts 201 can operate between locked, in the time that operating parts 201 is positioned at unlocked position, the first engaged element 202 is positioned at the primary importance away from the second engaged element, now output shaft 195 is not locked, axle lock-switch 204 is not triggered simultaneously, motor 17 can be unlocked, machine can normally be worked, in the time that operating parts 201 is positioned at latched position, the first engaged element 202 drives and is moved to the second place engaging with the second engaged element at operating parts 201, now output shaft 195 is locked, axle lock-switch 204 is triggered simultaneously, motor 17 cannot be opened.By the locking of output shaft 195, impact screwdriver 10 is switched to manual screw by electric screwdriver and criticize, and in locking, control disconnection motor 17 circuit, cut off motor 17 and rotate, make the security performance of complete machine higher.

Concrete, operating parts 201 is with respect to rotatable its front end that is arranged on of casing 11, its of main body formation is cup-shaped, centre has a through hole and passes for output shaft 195, output shaft 195 is by a collar (figure is mark not) axial location, the outer surface of the first engaged element 202 has multiple protruding 202a, corresponding, casing 11 front ends have chute 111, on the first engaged element 202, utilize protruding 202a to be arranged in axial sliding in chute 111 along output shaft 195, on the outer surface of the first engaged element 202, also there is a skewed slot 202b, the pin 205 that operating parts 202 slides in skewed slot 202b with an energy is fixedly connected with, pin 205 rotarily drives the first engaged element 202 along moving axially along with operating parts 201, in other embodiments, operating parts 201 can be to be also fixedly connected with the first engaged element 202 or integrally formed, and in casing 11 upper ends, an open slot is set, operating parts 201 can move axially in groove, drive the first engaged element 202 to move by moving axially of operating parts 201, on the outer circumference surface of the second engaged element 203, be formed with multiple groove 203a that can engage with above-mentioned protruding 202a, when protruding 202a on the first engaged element 211 moves axially to it engages with groove 203a, output shaft is locked, axle lock-switch 204 is arranged on casing 11 front ends, axially upper near operating parts 201, on operating parts 201, there is a crowning (not shown), in the time rotating to latched position, crowning can trigger axle lock-switch 204, cut off motor 17 circuit.Be understandable that, in the embodiment that above-mentioned output shaft 195 locks, the second engaged element 203 is that two individual components form with output shaft 195, also can be directly on output shaft, 195 form engaging structures, the first engaged element 201 directly locks output shaft 195.In addition, the triggering of above-mentioned axle latch mechanism 20 intermediate axle lock switches 204 realizes mechanically, also can be by the lock-out state of monitoring output shaft between PCB control panel 16, and realize the break-make of circuit by electronics mode.

Common impact screwdriver, because volume is larger, is often difficult to carry out operation in narrow and small working space, and the screwdriver of small volume is because the lower output torque of voltage not usually cannot meet user's demand.In order to overcome above-mentioned defect, need cell voltage and the performance parameter of impact screwdriver to be optimized, the battery 13 that impact screwdriver 10 in the utility model embodiment adopts is built-in lithium cells, because the voltage of battery is under normal circumstances directly proportional to the volume of itself, in order to reduce volume, the rated voltage of battery is set and is less than or equal to 4.25v, preferred scope is between 3.6V-4.2V, the rated voltage of the battery 13 adopting in present embodiment is at 3.6v, and the rotating speed turning by motor self 20000 forms the striking frequency that is greater than 30Hz, preferred striking frequency scope is between 35Hz-50Hz, more than the output torque of final output shaft 195 can reach 8Nm, preferred scope is between 8Nm-16Nm, the outputting torsion of output shaft 195 (in Nm) can reach 1.8-4.5 with the ratio of the rated voltage of described battery thus, preferably between 1.8-3.4, realize the output of the high moment of torsion of low-voltage.

Adopt that the impact screwdriver 10 of above-mentioned parameter is less than common impact screwdriver volume, structure is more compact, can meet in common scenarios and small space and use, being convenient to user carries, criticize torsion than normal screws larger, and dispose axle latch mechanism 20, can, according to need of work, between electric operating or manual operation, switch, meet to greatest extent client's demand.In addition, impact the part of part 19, as hammer 192 into shape, hammer anvil 194, output shaft 195 all adopt mold members, makes as powdered metallurgical material or accurate manufacture parts, reduced the cost of product in proof strength, makes it have more cost performance.

Although the utility model discloses as above with preferred embodiment, so it is not in order to limit the utility model.Under the utility model, in technical field, have and conventionally know the knowledgeable, not departing from spirit and scope of the present utility model, when being used for a variety of modifications and variations.Therefore, protection domain of the present utility model is when being as the criterion depending on claims person of defining.

Claims (7)

1. an impact screwdriver, comprise casing, be arranged on the battery in casing, be positioned at the motor of casing inside, by motor-driven running part and impact part, described motor has a driving shaft that rotation output is provided, rotation output after described running part slows down the rotation output of described driving shaft, described impact portion is divided and is comprised hammer, match and merge the hammer anvil that is subject to its strike with described hammer, by the output shaft of hammer anvil driven rotary, it is characterized in that: described impact screwdriver also comprises an axle latch mechanism that described impact screwdriver can be switched between electric operating or manual operation.

2. impact screwdriver according to claim 1, is characterized in that: described hammer, hammer anvil and the output shaft that impacts part is metallic sintered products or accurate die casting, and described hammer anvil and output shaft can be individual part integrally formed or that be formed separately.

3. impact screwdriver according to claim 1, it is characterized in that: described axle latch mechanism comprises the first engaged element being installed on casing and can be connected at the operating parts operating between locked, with operating parts and be arranged on the second engaged element on output shaft, described the first engaged element have away from the primary importance of the second engaged element and under the drive of operating parts movement as for the second place engaging with the second engaged element.

4. impact screwdriver according to claim 3, it is characterized in that: the outer surface of described the first engaged element has multiple projections, described casing is provided with for the axially movable chute of the first engaged element, is formed with multiple grooves that can coordinate with described projection on the outer circumference surface of described the second engaged element.

5. impact screwdriver according to claim 3, it is characterized in that: described operating parts can rotate relative to casing, the outer surface of described the first engaged element is provided with skewed slot, and described skewed slot is provided with the axially movable pin of the first engaged element that can slide and impel under the rotarily driving of operating parts thereon.

6. impact screwdriver according to claim 3, is characterized in that: described axle latch mechanism also comprises an axle lock-switch being triggered by described operating parts, the break-make of motor circuit described in the control of described axle lock-switch.

7. according to the impact screwdriver described in any one in claim 1-6, it is characterized in that: described battery is lithium battery.