CN2728721Y

CN2728721Y - Centrifugal electric wrench

Info

Publication number: CN2728721Y
Application number: CN 200420090810
Authority: CN
Inventors: 钱贤平
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-09-30
Filing date: 2004-09-30
Publication date: 2005-09-28
Anticipated expiration: 2014-09-30

Abstract

The utility model discloses a centrifugal electric spanner, comprising a body case, a generator arranged in the body case, a ratchet and a ratchet clutch mechanism, and a ratchet wheel; the ratchet wheel and the ratchet are opposite to each other, the front end of the rotation shaft of the ratchet wheel stretches out, and is used as an output rotation shaft. The utility model is characterized in that the output shaft of the generator is sheathed with a centrifugal block, the centrifugal block can slide in a radial direction, and is embedded with a rubbing strip on the outer circumference surface; the rubbing strip and the centrifugal block are covered in a steel bowl which is rotation shaft interlocked with the clutch mechanism of the ratchet, and are connected with the steel bowl in a friction type. At least two centrifugal blocks are provided, and the centrifugal blocks in equal space cover a slide shaft connected with the output shaft of the generator; the rubbing strip disengaged from the frictional connection with the steel bow, because the centrifugal blocks drove by the output shaft of the generator has not enough centrifugal force, with a low rotating speed, the generation of the overcurrent of the generator is effectively avoided, and the reliable operation of the generator is guaranteed. The clutch movement of the ratchet and the ratchet wheel is much more reliable, adopting the clutch mode with a guide column, a press plate and a pull plate; the utility model is much more practical, with long service life.

Description

Centrifugal electric spanner

Technical field

The utility model relates to a kind of motor-driven electric wrench, especially refers to a kind of centrifugal electric spanner.

Background technology

Existing centrifugal electric spanner generally comprises casing, be positioned at the motor of casing, ratchet and ratchet clutch mechanism, ratchet and output revolving shaft, the head of output revolving shaft stretches out outside the casing, and ratchet clutch mechanism has various different structure, but no matter adopt any ratchet clutch mechanism, existing centrifugal electric spanner all links the rotating shaft of fixedly connected modes such as the spline of motor output shaft by routine and ratchet clutch mechanism without exception, make the rotation of motor drive the rotation of ratchet clutch mechanism, when reaching certain speed, ratchet clutch mechanism temporarily decontrols ratchet, make ratchet deflection under action of centrifugal force, the bump ratchet makes it to rotate, behind the bump, the ratchet rotating speed descends, and is resetted by its clutch locking again, when rotating speed rises to certain speed once more, repeat above-mentioned action, go round and begin again like this, turn parts such as bolt by output shaft, thereby realize the function of electric wrench.But in actual use, when being in, the bolt of being twisted screws state following time, or output shaft is subjected to resistance and when stopping operating, since between the rotating shaft of motor output shaft and ratchet clutch mechanism for fixedlying connected, therefore stall will take place and produce overcurrent in machine shaft, around bad, and influence its use when this overcurrent is serious even with motor.In addition, existing ratchet clutch mechanism, be in the design disclosed in " a kind of centrifugal electric wrench " of CN2541133Y as publication number, because it adopts centrifugal leverage, promptly under different rotating speeds, lever rotates by the effect that overcomes extension spring, and the head of spacer pin is stretched into or pulls out outward in pawl base, ratchet is resetted or swing, thereby realize the clutch action of ratchet and ratchet.But find that in actual application because the elastic fatigue of spring after work a period of time, can't make spacer pin work reliably, and service life is short, so that influence the normal use of electric wrench.

Summary of the invention

Technical problem to be solved in the utility model is that a kind of centrifugal electric spanner that prevents that motor overcurrent from producing is provided at above-mentioned prior art present situation.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: this centrifugal electric spanner comprises casing, is positioned at the motor of casing, ratchet and ratchet clutch mechanism and ratchet, ratchet and front end ratchet rotating shaft relative with ratchet stretches out outside the casing as output revolving shaft, it is characterized in that: be with centrifugal that to radially slide and on its outer circumference surface, be embedded with friction plate on the described motor output shaft, and in the steel bowl that described friction plate and centrifugal cover on ratchet clutch mechanism rotating shaft links and with it friction-type connects.

Described centrifugal is at least two, is enclosed within on the sliding axle that fixes with motor output shaft respectively even cloth.

Can also be with on the described motor output shaft above-mentioned centrifugal and friction plate are blocked in block in the steel bowl; And described block and sliding axle are good to make integral piece.

Described ratchet clutch mechanism can also comprise pawl seat, guide pillar, pressing plate and arm-tie, on pawl seat wall, extend central shaft as above-mentioned rotating shaft with respect to motor, described arm-tie is enclosed within on this central shaft, one end of its end and pressing plate offsets, this pressing plate can rotate around the bearing pin at its middle part, and its other end is mutually low with the afterbody of guide pillar, described guide pillar then is slidably disposed in the corresponding through hole of pawl seat, and when its head stretches out this through hole, just in time insert in the respective through hole of ratchet, and between pawl seat and guide pillar, be provided with and make guide pillar have back-moving spring all the time to pressing plate other end side shifting trend.

Described pawl seat appearance can be provided with the groove that connects with through hole, in this groove, accommodate a place kick and make place kick have retainer spring all the time, but then be provided with the recess of holding portion place kick with the corresponding guide pillar of this groove surface to through hole side shifting trend.

Described pressing plate is good to be the L type, and above-mentioned bearing pin is positioned at its corner and is fixed on the boss of pawl seat, and correspondingly is provided with the bending edge that matches with L type pressing plate one end in the end of arm-tie.

Compared with prior art, advantage of the present utility model is: in case output revolving shaft is subjected to external force during stall, because rotating speed step-down, centrifugal of driving of motor output shaft do not have enough centrifugal force and friction plate on it broken away from connect with the friction of steel bowl, promptly be equivalent to motor output shaft and break away from ratchet clutch mechanism, thereby avoided the generation of motor overcurrent effectively, ensured the reliably working of motor; And the clutch mode of employing guide pillar, pressing plate and arm-tie makes the clutch action of ratchet and ratchet more reliable, has prolonged its service life simultaneously, so the utility model uses more practical.

Description of drawings

Fig. 1 is the structural representation of guide pillar when ejecting state among the utility model first embodiment.

Fig. 2 is for removing the structural representation of behind the baffle plate centrifugal, sliding axle, friction plate and steel bowl among Fig. 1.

Fig. 3 is the structural representation of centrifugal, sliding axle, friction plate and steel bowl among the utility model second embodiment.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

Embodiment 1, as shown in Figure 1, this centrifugal electric spanner comprises casing 1, be positioned at the motor 2 of casing 1, ratchet 7 and ratchet clutch mechanism and ratchet, relative and the front end ratchet rotating shaft of ratchet and ratchet 7 stretches out outside the casing 1 as output revolving shaft 8, ratchet clutch mechanism comprises pawl seat 6 again, guide pillar 10, pressing plate 9, place kick 11 and arm-tie 5, on pawl seat 7 walls, extend central shaft 12 as the rotating shaft of ratchet clutch mechanism with respect to motor 2, described arm-tie 5 is enclosed within on this central shaft 12, and be provided with a bending edge 15 in its end, and an end of this bending edge 15 and a L type pressing plate 9 offsets, this L type pressing plate 9 is rotatably fixed on the boss of pawl seat 6 in its corner by bearing pin, pressing plate 9 can be rotated around its middle part, and its other end is mutually low with the afterbody of guide pillar 10, this guide pillar 10 is slidably disposed in the corresponding through hole of pawl seat 6, and just in time inserts when its head stretches out this through hole in the respective through hole 17 of ratchet 7; For guide pillar 10 can be automatically reset, be with a back-moving spring 14 in the guide pillar afterbody end outside, one end of this back-moving spring 14 is against on the end face of pawl seat 6, and the other end is against on the flange of guide pillar 10 afterbodys, makes guide pillar 10 have all the time to pressing plate 9 other end side shifting trend; Also be provided with the groove that connects with through hole in described pawl seat 6 appearances, in this groove, accommodate place kick 11 and retainer spring 16, these retainer spring 16 1 ends are against on the spring base that is positioned at groove top, the other end is against in the place kick 11, make place kick 11 have trend all the time to the through hole side shifting, but then be provided with the recess 13 of holding portion place kick 11 with the corresponding guide pillar of this groove 10 surfaces, therefore guide pillar 10 is in moving process, when the recess on groove and the guide pillar 13 aligns, this place kick 11 can partly fall within the recess 13, slides with respect to pawl seat 6 to stop guide pillar 10.

And link in the following manner between motor and the ratchet clutch mechanism central shaft 12: as depicted in figs. 1 and 2, on motor output shaft 3, be fixed with a sliding axle 21 by keyway, the cross section of this sliding axle 21 is waist shape, outside it, be with two centrifugal 4 that to radially slide along this sliding axle, and centrifugal 4 outer face is circle-shaped, on its outer circumference surface, be embedded the friction plate of making by synthetic plastic 19, and friction plate 19 and centrifugal 4 cover in the steel bowl 18 that links with ratchet clutch mechanism central shaft 12 and with it friction connect.

In order to make centrifugal 4 and friction plate 19 covers in the steel bowl 18 reliably, on motor output shaft, also be with a baffle plate 20, spacing in steel bowl 18 with centrifugal 4.

During use, when electric wrench is not worked or motor 2 is under the state that slowly runs, because centrifugal force is not enough so that throw away for centrifugal 4, be not produce frictional force between friction plate 19 on its outer circumference surface and the steel bowl 18, this moment, central shaft 12 did not rotate, under the effect of back-moving spring 14, the through hole 17 that guide pillar 10 breaks away from the ratchet, in the process that pressing plate 9 sides reset, when recess 13 was relative with groove on the pawl seat, place kick 11 was in the effect of retainer spring 16 at guide pillar 10, part falls in the recess 13, make guide pillar 10 with respect to pawl seat 6 location, motor 2 was rotated, output revolving shaft 8 can not rotate yet.In case and motor 2 is when arriving certain rotating speed, under the effect of rotary centrifugal force, outwards move along sliding axle 21 footpath for centrifugal 4, promptly be thrown out of, cause friction plate 19 to rub mutually with steel bowl 18 inwalls, thereby drive central shaft 12 rotations, this moment, arm-tie 5 outwards slided under the migrating of centrifugal force, and the bending edge 15 of its end is pushed an end of L type pressing plate 9 simultaneously, L type pressing plate 9 is rotated counterclockwise, then the other end of pressing plate 9 promotes the afterbody of guide pillar 10, overcomes the active force of back-moving

spring

14, and 10 moments of guide pillar are ejected, as shown in Figure 1, in this process, guide pillar 10 is also oppressed place kick 11 and is moved in groove, and compression set spring 16 thereupon, make place kick 11 be positioned at groove fully, the head of guide pillar 10 stretches in the through hole 17 of ratchet 7 like this, and ratchet 7 is meshed with ratchet, drives output revolving shaft 8 and rotates, can turn bolt, realize the function of spanner.And when tight a bolt or the stopping of external force under, output revolving shaft 8 and pawl seat 6 and rotating shaft stop operating, then arm-tie 5 loses the centrifugal force homing, its end bending edge 15 leaves an end of

pressing plate

9,10 of guide pillars to pressing plate 9 other end side shiftings, make guide pillar 10 heads break away from the through hole 17 of ratchet under the effect of back-moving spring 14.The work that like this goes round and begins again, and in whole process, owing to connect for rubbing between centrifugal of driving of motor output shaft 3, friction plate and the steel bowl inwall, therefore motor output shaft 3 is still rotatable, thereby prevented the generation of overcurrent effectively, it is more safe and reliable to make the utility model use.

Embodiment 2, and as shown in Figure 3, itself and the above-mentioned first embodiment difference are baffle plate and sliding axle are made integral piece, make install convenient.

Claims

1, a kind of centrifugal electric spanner, it comprises casing (1), is positioned at the motor (2) of casing, ratchet (7) and ratchet clutch mechanism and ratchet, ratchet and front end ratchet rotating shaft relative with ratchet (7) stretches out outside the casing (1) as output revolving shaft (8), it is characterized in that: be with centrifugal (4) that can radially slide and on its outer circumference surface, be embedded with friction plate (19) on the described motor output shaft (3), and in the steel bowl (18) that described friction plate (19) and centrifugal (4) cover on ratchet clutch mechanism rotating shaft links and with it friction-type connects.

2, centrifugal electric spanner according to claim 1 is characterized in that: described centrifugal (4) are at least two, are enclosed within on the sliding axle (21) that fixes with motor output shaft (3) respectively even cloth.

3, centrifugal electric spanner according to claim 2 is characterized in that: also be with on the described motor output shaft (3) above-mentioned centrifugal (4) and friction plate (19) are blocked in the interior block (20) of steel bowl (18).

4, centrifugal electric spanner according to claim 3 is characterized in that: described block (20) is an integral piece with sliding axle (21).

5, according to the described centrifugal electric spanner of the arbitrary claim of claim 1 to 4, it is characterized in that: described ratchet clutch mechanism comprises pawl seat (6), guide pillar (10), pressing plate (9) and arm-tie (5), on pawl seat wall (6), extend central shaft (12) as above-mentioned rotating shaft with respect to motor, described arm-tie (5) is enclosed within on this central shaft (12), one end of its end and pressing plate (9) offsets, this pressing plate (9) can rotate around the bearing pin at its middle part, and its other end is mutually low with the afterbody of guide pillar (10), described guide pillar (10) then is slidably disposed in the corresponding through hole of pawl seat (6), and when its head stretches out this through hole, just in time insert in the respective through hole (17) of ratchet (7), and between pawl seat (6) and guide pillar (10), be provided with and make guide pillar have back-moving spring (14) all the time to pressing plate other end side shifting trend.

6, centrifugal electric spanner according to claim 5, it is characterized in that: described pawl seat (6) appearance is provided with the groove that connects with through hole, in this groove, accommodate a place kick (11) and make place kick have retainer spring (16) all the time to through hole side shifting trend, with the corresponding guide pillar of this groove (10) but the surface then is provided with the recess (13) of holding portion place kick (11).

7, centrifugal electric spanner according to claim 6, it is characterized in that: described pressing plate (9) is the L type, above-mentioned bearing pin is positioned at its corner and is fixed on the boss of pawl seat (6), and correspondingly is provided with the bending edge (15) that matches with L type pressing plate (9) one ends in the end of arm-tie (5).

8, centrifugal electric spanner according to claim 5, it is characterized in that: described pressing plate (9) is the L type, above-mentioned bearing pin is positioned at its corner and is fixed on the boss of pawl seat (6), and correspondingly is provided with the bending edge (15) that matches with L type pressing plate (9) one ends in the end of arm-tie (5).