CN201239943Y

CN201239943Y - Impact switching mechanism of impact drill

Info

Publication number: CN201239943Y
Application number: CNU200820050101XU
Authority: CN
Inventors: 任溪仁; 白志伟; 夏燃燃
Original assignee: Dongguan Qunsheng Powder Metallurgy Co Ltd
Current assignee: Dongguan Best Power Tools Co., Ltd.
Priority date: 2008-07-03
Filing date: 2008-07-03
Publication date: 2009-05-20
Anticipated expiration: 2018-07-03

Abstract

The utility model relates to the electric tool technology field, in particular to an impact switching device of a percussion drilling, which comprises an upper ratchet wheel, a lower ratchet wheel, a locking ring, a columnar impact knob, a support saddle, a slipper block, an up stroke pin and a self-locking spring plate. The slipper block is connected with the support saddle in a slippage manner; a trepan boring is opened on the support saddle; one end of the impact knob is rotatablely arranged in the trepan boring in a penetrating manner and butts against the slipper block; an annular lug boss is arranged on the outside surface of the impact knob; one end of the self-locking spring plate is fixed on an inner wall of the trepan boring, and the other end thereof is bended; an incline groove is arranged at the upper end of the slipper block; the upper end of the up stroke pin fixedly contacts with the locking ring, and the lower end thereof butts against the incline groove; the impact function can be served through pressing the impact knob; by adopting the structure, the switching of an impact option and the adjustment of torsion value are independent mutually, and the switching operation between the impact option and a torque force option can be performed at any time; one impact knob can realize the functional operation for the switching of the impact option and the replacement of the torque force option, the use is convenient, the safety is high, and the work efficiency is high.

Description

The impact switching device shifter of percussion drill

Technical field:

The utility model relates to the electric tool technical field, particularly a kind of impact switching device shifter of percussion drill.

Background technology:

At present, the traditional percussion drill that occurs on the market has three kinds of mode of operations usually, and these three kinds of mode of operations are that electric screw is criticized respectively, electric drill and percussion drill, corresponding three the function shelves of three kinds of mode of operations, it regulates switching between outputting torsion and each function shelves by rotating a torsion cup.This percussion drill comprises tooth case fore shell, torsion cup, output main shaft, is socketed in last ratchet, bottom ratchet wheel, ring gear, gear train and motor on the output main shaft, the torsion cup is threaded with the upper end of tooth case fore shell by adjusting nut, bottom ratchet wheel and last ratchet engaged, adjust the nut below be provided with the trip stop pad and be arranged on the trip stop pad with the adjustment nut between the compression spring, be provided with steel ball between ring gear and the trip stop pad, when the rotary torsion cup, torsion cup and adjustment nut just can be oppressed compression spring, trip stop pad and the steel ball etc. under it, thereby adjust outputting torsion; When switching to the impact shelves, there is the axial impact gap in up the causing of last ratchet between two ratchets, and the output main shaft is axially reciprocating by the interaction of last ratchet and bottom ratchet wheel, thereby realizes impact function.This percussion drill will impact the position that shelves are located at torsion cup acrotorque shelves usually, yet, percussion drill considers for safety problem, at the product on the market before use or all be to switch to minimum torsion shelves after finishing to use, and when using percussion drill, often to and impact between the shelves and switch at minimum torsion shelves, the angle that each switching will be rotated is bigger, and just can carry out after motor need being shut down when switching, and uses inconvenient, security is low, inefficiency.

The utility model content:

The purpose of this utility model is that a kind of impact switching device shifter that can at any time carry out the percussion drill that switches between each function shelves is provided at the deficiencies in the prior art.

For achieving the above object, the utility model adopts following technical scheme:

The impact switching device shifter of percussion drill, it includes ratchet and bottom ratchet wheel, last ratchet closely cooperates with the output main shaft, bottom ratchet wheel and last ratchet engaged, it also includes the locking circle, stretch out the outer cylindricality of tooth case fore shell and impact knob, with the fixing bearing of tooth case fore shell, slide block, last marketing, self-locking spring slice, the bottom ratchet wheel outer surface is provided with projection, the locking circle is movably arranged on the below of bottom ratchet wheel, locking circle inner surface is provided with the draw-in groove corresponding with projection, slide block and bearing are slidingly connected, offer trepanning on the bearing, an end that impacts knob rotates to be located in the trepanning and with slide block to be replaced mutually, the outer surface that impacts knob is provided with the annular boss that can replace mutually with self-locking spring slice, offers the groove that staggers with self-locking spring slice on the boss, and an end of self-locking spring slice is fixed on the inwall of trepanning, the other end is towards the rear end bending of impacting knob, upper end of slide block is provided with oblique type groove, and the upper end of last marketing is fixing to be contacted with the locking circle, and its lower end is replaced in oblique type groove.

The rear end of described slide block is provided with the returning spring that connects slide block and tooth case fore shell.

Be provided with the compression spring between described impact knob and the bearing, the outer surface that impacts the close front end of knob is provided with locating hole, offers fixing hole on the front end face of bearing, and an end of compression spring is fastened in the locating hole, and the other end is fastened in the fixing hole.

The front end face of described impact knob is provided with twists bar.

Described self-locking spring slice is two, and two self-locking spring slices are symmetricly set on the inwall of trepanning.

One end of described self-locking spring slice offers slot, offers axial jack on the inwall of trepanning, is provided with card article in the jack, and self-locking spring slice is plugged in the jack, and slot and card article clamping.

Described impact switching device shifter also comprises the trip stop bearing pin that is arranged between trip stop pad and the ring gear, and the trip stop bearing pin is provided with the shaft shoulder, and slide block is provided with the fixture block with shaft shoulder clamping, and the shaft shoulder is positioned at the below of fixture block.

The utility model beneficial effect is: the utility model includes ratchet and bottom ratchet wheel, last ratchet closely cooperates with the output main shaft, bottom ratchet wheel and last ratchet engaged, it also includes the locking circle, stretch out the outer cylindricality of tooth case fore shell and impact knob, with the fixing bearing of tooth case fore shell, slide block, last marketing, self-locking spring slice, the bottom ratchet wheel outer surface is provided with projection, the locking circle is movably arranged on the below of bottom ratchet wheel, locking circle inner surface is provided with the draw-in groove corresponding with projection, slide block and bearing are slidingly connected, offer trepanning on the bearing, an end that impacts knob rotates to be located in the trepanning and with slide block to be replaced mutually, the outer surface that impacts knob is provided with the annular boss that can replace mutually with self-locking spring slice, offer the groove that staggers with self-locking spring slice on the boss, one end of self-locking spring slice is fixed on the inwall of trepanning, and the other end is towards the rear end bending of impacting knob, and upper end of slide block is provided with oblique type groove, the upper end of last marketing is fixing to be contacted with the locking circle, and its lower end is replaced in oblique type groove; When using impact function, press the impact knob, impacting knob slides with pushing direction with slide block, oblique type groove will go up marketing and up jack-up is enclosed in locking, the draw-in groove of locking circle and the projection clamping of bottom ratchet wheel, thereby it is the circumferencial direction of bottom ratchet wheel is locked, the output main shaft is axially reciprocating by the interaction of last ratchet and bottom ratchet wheel, thereby realization impact function, the impact shelves of this structure switch to be regulated separate with torque magnitude, impacting shelves switches by impacting knob control, whenever can impact the handover operation between shelves and the torsion shelves, in the process of motor operations, still can carry out handover operation, easy to use, safe, high efficiency.

In addition, press impact knob after, when impacting boss on the knob and sliding into an end of self-locking spring slice bending, self-locking spring slice replaces and locks boss under the effect of elastic force, is locked in the position of impacting grade thereby will impact knob; To impact shelves if desired resets when switching to the torsion shelves, only need the rotary impact knob, make the groove that impacts on the knob boss formation empty avoiding of aliging with self-locking spring slice, self-locking spring slice separates with boss, the locking of impacting knob is disengaged, feasible impact knob can slide and return to original state, the while slide block, last marketing, the locking circle, bottom ratchet wheel recovers reset condition, percussion drill switches to torsion shelves state, thereby realize electric drill or the function that screws, an impact knob just can be realized impacting the feature operation that shelves switch and the torsion shelves reset, and is easy to use, simple in structure.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a decomposing schematic representation of the present utility model;

Fig. 3 is the structural representation that the utility model impacts knob;

Fig. 4 is a cutaway view of using percussion drill of the present utility model.

The specific embodiment:

Below in conjunction with accompanying drawing the utility model is further described, see Fig. 1～4, the impact switching device shifter of percussion drill, it includes ratchet 12 and bottom ratchet wheel 20, last ratchet 12 closely cooperates with output main shaft 11, bottom ratchet wheel 20 and last ratchet 12 engagements, it also includes locking circle 21, stretch out tooth case fore shell 10 outer cylindricalitys and impact knob 22, with the fixing bearing 25 of tooth case fore shell 10, slide block 23, last marketing 24, self-locking spring slice 26, bottom ratchet wheel 20 outer surfaces evenly are provided with a plurality of projections 201, locking circle 21 is movably arranged on the below of bottom ratchet wheel 20, locking circle 21 inner surfaces are provided with the draw-in groove 211 corresponding with projection 201, locking circle 21 can move up and down along tooth case fore shell 10, projection 201 clampings of draw-in groove 211 and bottom ratchet wheel 20 when moving on the locking circle 21, and the circumferencial direction of bottom ratchet wheel 20 is locked, locking circle 21 then separates with bottom ratchet wheel 20 when moving down, bottom ratchet wheel 20 rotary state that affranchises.Slide block 23 is slidingly connected with bearing 25, offer trepanning 251 on the bearing 25, an end that impacts knob 22 rotates to be located in the trepanning 251 and with slide block 23 to be replaced mutually, the outer surface that impacts knob 22 is provided with the annular boss 221 that can replace mutually with self-locking spring slice 26, offer the groove 222 that staggers with self-locking spring slice 26 on the boss 221, one end of self-locking spring slice 26 is fixed on the inwall of trepanning 251, the other end is towards the rear end bending of impacting knob 22, slide block 23 upper ends are provided with oblique type groove 231, the upper end of last marketing 24 is fixing to be contacted with locking circle 21, its lower end is replaced in oblique type groove 231, and tiltedly type groove 231 can promote marketing 24 and encloses 21 with locking and move up and down.

The rear end of slide block 23 is provided with the returning spring 27 that connects slide block 23 and tooth case fore shell 10.Impact and be provided with compression spring 28 between knob 22 and the bearing 25, the outer surface that impacts knob 22 close front ends is provided with locating hole 223, offer fixing hole 252 on the front end face of bearing 25, an end of compression spring 28 is fastened in the locating hole 223, and the other end is fastened in the fixing hole 252.The front end face that impacts knob 22 is provided with twists bar 224, convenient manual rotary impact knob 22.

Self-locking spring slice 26 is two, and two self-locking spring slices 26 are symmetricly set on the inwall of trepanning 251, and two self-locking spring slices 26 act on the boss 221 that impacts knob 22 simultaneously, and it is stressed than balance to impact knob 22.One end of self-locking spring slice 26 offers slot 261, offers axial jack 253 on the inwall of trepanning 251, is provided with card article 254 in the jack 253, and self-locking spring slice 26 is plugged in the jack 253, and slot 261 and card article 254 clampings.

Impact switching device shifter and also comprise the trip stop bearing pin 30 that is arranged between trip stop pad 13 and the ring gear 14, trip stop bearing pin 30 is provided with the shaft shoulder 301, and slide block 23 is provided with the fixture block 233 with the shaft shoulder 301 clampings, and the shaft shoulder 301 is positioned at the below of fixture block 233.After pressing impact knob 22, the shaft shoulder 301 on the fixture block 233 stuck trip stop bearing pins 30 on the slide block 23 makes trip stop bearing pin 30 can not produce axial action under the effect of ring gear 14.

Operation principle of the present utility model is: when using impact function, press and impact knob 22, impacting knob 22 slides with pushing direction with slide block 23, tiltedly type groove 231 will be gone up marketing 24 and lock up jack-up of circle 21, the draw-in groove 211 of locking circle 21 and projection 201 clampings of bottom ratchet wheel 20, thereby it is the circumferencial direction of bottom ratchet wheel 20 is locked, output main shaft 11 is axially reciprocating by the interaction of last ratchet 12 and bottom ratchet wheel 20, thereby realization impact function, at the same time, after boss 221 on the impact knob 22 slides into an end of self-locking spring slice 26 bendings, self-locking spring slice 26 replaces and locks boss 221 under the effect of elastic force, be locked in the position of impacting shelves thereby will impact knob 22; To impact shelves if desired resets when switching to the torsion shelves, only need rotary impact knob 22, make the groove 222 that impacts on the knob 22 boss 221 formation empty avoiding of aliging with self-locking spring slice 26, self-locking spring slice 26 separates with boss 221, the locking of impacting knob 22 is disengaged, and makes that impacting knob 22 can slide and return to original state, simultaneously slide block 23, on be on sale throughout 24, locking circle 21, bottom ratchet wheel 20 recover reset conditions, percussion drill switches to torsion shelves state, thereby realizes electric drill or the function that screws.The impact shelves of this structure switch to be regulated separate with torque magnitude, impacting shelves switches by impacting knob 22 controls, whenever can impact the handover operation between shelves and the torsion shelves, in the process of motor operations, still can carry out handover operation, easy to use, safe, high efficiency; And an impact knob 22 just can be realized impacting the feature operation that shelves switch and the torsion shelves reset, and is easy to use, simple in structure.

Torsion cup 15 clockwise rotates from minimum torsion shelves, can only go to the electric drill shelves, outputting torsion progressively rises, and can not realize impacting the switching of shelves by rotary torsion cup 15, can only realize that screw shelves and electric drill shelves switch, switch to and impact shelves and only press and impact knob 22 and just can realize.

The above only is a better embodiment of the present utility model, so all equivalences of doing according to the described structure of the utility model patent claim, feature and principle change or modify, is included in the utility model patent claim.

Claims

1, the impact switching device shifter of percussion drill, it includes ratchet (12) and bottom ratchet wheel (20), last ratchet (12) closely cooperates with output main shaft (11), bottom ratchet wheel (20) and last ratchet (12) engagement, it is characterized in that: it also includes locking circle (21), stretch out the outer cylindricality of tooth case fore shell (10) and impact knob (22), with the fixing bearing (25) of tooth case fore shell (10), slide block (23), last marketing (24), self-locking spring slice (26), bottom ratchet wheel (20) outer surface is provided with projection (201), locking circle (21) is movably arranged on the below of bottom ratchet wheel (20), locking circle (21) inner surface is provided with the draw-in groove (211) corresponding with projection (201), slide block (23) is slidingly connected with bearing (25), offer trepanning (251) on the bearing (25), an end that impacts knob (22) rotates to be located in the trepanning (251) and with slide block (23) to be replaced mutually, the outer surface that impacts knob (22) is provided with the annular boss (221) that can replace mutually with self-locking spring slice (26), offer the groove (222) that staggers with self-locking spring slice (26) on the boss (221), one end of self-locking spring slice (26) is fixed on the inwall of trepanning (251), the other end is towards the rear end bending of impacting knob (22), slide block (23) upper end is provided with oblique type groove (231), the upper end of last marketing (24) is fixing to be contacted with locking circle (21), and its lower end is replaced in oblique type groove (231).

2, the impact switching device shifter of percussion drill according to claim 1 is characterized in that: the rear end of described slide block (23) is provided with the returning spring (27) that connects slide block (23) and tooth case fore shell (10).

3, the impact switching device shifter of percussion drill according to claim 1, it is characterized in that: be provided with compression spring (28) between described impact knob (22) and the bearing (25), the outer surface that impacts the close front end of knob (22) is provided with locating hole (223), offer fixing hole (252) on the front end face of bearing (25), one end of compression spring (28) is fastened in the locating hole (223), and the other end is fastened in the fixing hole (252).

4, the impact switching device shifter of percussion drill according to claim 1 is characterized in that: the front end face of described impact knob (22) is provided with twists bar (224).

5, the impact switching device shifter of percussion drill according to claim 1 is characterized in that: described self-locking spring slice (26) is two, and two self-locking spring slices (26) are symmetricly set on the inwall of trepanning (251).

6, the impact switching device shifter of percussion drill according to claim 1, it is characterized in that: an end of described self-locking spring slice (26) offers slot (261), offer axial jack (253) on the inwall of trepanning (251), be provided with card article (254) in the jack (253), self-locking spring slice (26) is plugged in the jack (253), and slot (261) and card article (254) clamping.

7, according to the impact switching device shifter of any described percussion drill of claim 1-6, it is characterized in that: described impact switching device shifter also comprises the trip stop bearing pin (30) that is arranged between trip stop pad (13) and the ring gear (14), trip stop bearing pin (30) is provided with the shaft shoulder (301), slide block (23) is provided with the fixture block (233) with the shaft shoulder (301) clamping, and the shaft shoulder (301) is positioned at the below of fixture block (233).