CN201175900Y - Power output apparatus of electrical tool - Google Patents

Abstract

The utility model provides a power output device of an electric tool, which comprises a seat body, a switch body, an impact mechanism, a pressing latch portion, an output portion and a rotary knob casing, and the seat body is driven to drive the output shaft by the power, thereby driving the tool to rotate. The switch portion is provided with a rotary knob which switches section speeds, and further, the rotary knob can control the position of a guide spring. The impact mechanism is provided with a directional wheel and a jumping wheel, wherein the directional wheel is movably combined on the output shaft, the jumping wheel is fixedly arranged in the output shaft, a convex tooth faces which can be mutually meshed are respectively formed by the top end face of the directional wheel and the bottom face of the jumping wheel, the bottom portion of the directional wheel is equipped with an outer ring, the freeness of the outer ring relative to rotation of the output shaft is determined by the change of the position of the guide spring, when the directional wheel is occluded by the guide spring, the freeness of the directional wheel is limited, and then function of the ratchet mechanism of the directional wheel is achieved, when the directional wheel is not occluded by the guide spring, the directional wheel can freely rotate along with the output shaft.

Description

The electric tool PTO

Technical field

The utility model relates to a kind of electric tool PTO, particularly relate to a kind of more smooth and easy when switching gear, easier structure of going into file.

Background technology

In the prior art, has the rotation outputting power, and the electric tool of output impact strength, the general switching mechanism that all has switching multistage gear output strength and form, and last gear provides the position that can do rotary power output and the output of impact strength simultaneously usually, yet the PTO of this class is made of unusual complicated assemblies.Based on this, it is too complicated that the Taiwan patent announcement promptly is to solve the existing structure of aforementioned PTO for No. 554808, so that the cost problem of higher.The structure of installing in the described patent include a pedestal, a switching part, a beater mechanism, a compression part, an output shaft, with a knob shell, wherein, this switching part has and is combined in a plurality of spacers that switch seat; This beater mechanism has a directional wheel and a wheel of beating, and wherein, directional wheel is combined in this output shaft versatilely, and the wheel of beating then is installed in described output shaft; This directional wheel top end face and this beat that the wheel bottom surface forms respectively can intermeshing convex side; The outer shroud of aforesaid spacer and directional wheel has corresponding position relation, therefore rotate described knob, can make the flange of knob bottom press this spacer, and then make flange around the outer shroud of this directional wheel of the protuberance blocking bottom in the spacer, cause the axial rotary freedom of this outer shroud to be restricted; Under this state, wheel and the intermeshing convex side separately of directional wheel are made of the inclined-plane tooth owing to beat, therefore when this biend produces relative motion, this wheel of beating can produce beats, and provide this output shaft to produce an axial intermittence and impact strength, thereby reach the function that power is impacted in output.

The utility model content

The purpose of this utility model, be to solve in No. the 554808th, the Taiwan patent announcement, when its knob is impacted the file position of power function to output, protuberance in the spacer can be pressed onto the flange in the directional wheel and produce interference, cause spacer can't insert the outer ring position of directional wheel smoothly, cause filing smoothly and must operate again once again, even operation problem repeatedly.

Based on above purpose, the utility model provides a kind of electric tool PTO, include a pedestal, a switching part, a beater mechanism, a compression part, an output shaft, with a knob shell; Described pedestal is driven by power and drives this output shaft, and then the rotation of drive instrument, to lock processing operations such as screw, drilling or impact.The knob that described switching part has a switching section speed can be controlled the position of certain position spring; This beater mechanism has activity and is combined in a directional wheel of this output shaft and is installed in the wheel of beating of one in this output shaft, the top end face of this directional wheel and this beat that the bottom surface of wheel forms respectively can intermeshing convex side, this directional wheel bottom installing one outer shroud, and this outer shroud can be subjected to this retainer spring the position change and determine its free degree with respect to output shaft rotation, when directional wheel is subjected to this retainer spring interlock, the free degree of directional wheel is restricted, and then make the ratchet mechanism generation effect of directional wheel, otherwise, when directional wheel was not subjected to this retainer spring interlock, then directional wheel can rotate freely along with output shaft.Therefore, when this knob is threaded to the impact gear, the tool ends end rotary power can be provided when output shaft rotates and impacts processing.

The utility model adopts retainer spring to replace aforesaid spacer, and the outer shroud of aforementioned directional wheel is made as wave-like, when knob is turned to the file position of non-output impact power function, get so that this retainer spring is arranged in the inside of knob, and corresponding to the corrugated trough of directional wheel, under this state, because retainer spring has flexible and elasticity, so the free degree when directional wheel rotates with respect to output shaft is unaffected, thereby can rotate outputting power.When knob is turned to the file position of output impact power function, because the structure in the knob is with the direction extruding of retainer spring towards directional wheel, make retainer spring insert in the corrugated trough of directional wheel, under this state, the rotary freedom of directional wheel is restricted, and then make the ratchet mechanism generation effect of directional wheel, so can guarantee all can successfully file when switching gear each.

Electric tool PTO of the present utility model compared with prior art, can guarantee all can successfully file when switching gear at every turn, and is more smooth and easy when allowing user's operational transformation gear, convenient.

Description of drawings

Fig. 1 is the three-dimensional exploded view of the utility model electric tool PTO;

Fig. 2 is the cross section view of pedestal in the utility model electric tool PTO;

Fig. 3 is the side direction cross section view of the directional wheel in the utility model electric tool PTO and the wheel field of conjugate action of beating;

Fig. 4 is the trough that retainer spring of the present utility model does not embed directional wheel, the section plan that causes directional wheel not to be restricted with the rotary freedom with respect to output shaft;

Fig. 5 has been for retainer spring of the present utility model has embedded the trough of directional wheel, the section plan that causes directional wheel to be restricted with respect to the rotary freedom of output shaft.

Among the figure,

1 pedestal, 11 input wheels

2 switching parts, 20 chassis

21 switch seat 21a wears groove

21b external screw thread 22 retainer springs

24 knob 24a internal threads

24b flange 25 springs

3 beater mechanisms, 31 directional wheels

31a convex side 31b ratchet portion

31c outer shroud 31d trough

32 beat takes turns the 32a convex side

33 grommets, 4 compression parts

41 elastomeric pads, 42 gasket rings

5 output shaft 5a bulge loops

6 knob shell 6a perforation

The specific embodiment

Below in conjunction with accompanying drawing and component symbol embodiment of the present utility model is done more detailed description, be familiar with this field person and after studying this specification carefully, can implement according to this thereby make.

Please refer to Fig. 1 and Fig. 2, be the preferred embodiment of the utility model electric tool PTO, it consists predominantly of a pedestal 1, a switching part 2, a beater mechanism 3, a compression part 4, an output shaft 5 and a knob shell 6.

Wherein, described pedestal 1 main body is a drive unit, and the one end forms the end face structure that can cooperate affixed these switching part 2 bottoms, and this end face structure has the input wheels 11 that extend this drive unit.

Described switching part 2 includes the switching seat 21 that internally extends a hollow cylindrical on a chassis 20, and is fixed in aforesaid pedestal 1 by these 20 bottoms, chassis.This switching seat 21 have several extend upward from the bottom and run through sidewall wear groove 21a, and one is surrounded on the external screw thread 21b that switches the seat top.Each is worn and embeds a location spring 22 in the groove 21a respectively, and at embodiment of the present utility model, described retainer spring 22 is a kind of have elasticity and flexible compression springs.Described screw thread 21b then makes up the knob 24 of a ring bodies, and the interior ring surface of this knob has the internal thread 24a that cooperates this switchings 21 top external screw thread 21b, and outstanding bottom and cooperate several flanges 24b of described retainer spring 22 positions.Before knob 24 is combined in switching seat 21, be inserted in a spring 25 at switching seat 21 earlier, after making knob 24 be combined in to switch seat 21, allow the two ends of spring 25 be butted between these switching part 2 chassis, 20 end faces and this knob 24 bottom surfaces, to provide this knob 24 suitable elastic force.

Described beater mechanism 3 includes a directional wheel 31, several ring bodies such as wheel 32 and one grommet 33 etc. of beating.An one convex side 31a and a 31b of ratchet portion are formed respectively on these directional wheel 31 top end faces and bottom, this convex side 31a is made of around mode with radiation several double wedges, have an outer shroud 31c that can do rotation with respect to this output shaft 5 around the 31b of this ratchet portion, the external diameter surface of this outer shroud 31c forms waveform and has a plurality of circular-arc crests and trough 31d.This wheel end of 32 of beating have can with the intermeshing convex side 32a of the convex side 31a of directional wheel 31, and described two groups of convex side 31a and 32a be respectively can be complementary inclined-plane tooth (as shown in Figure 3), make when this two convex sides 31a with 32a during in the engagement relative rotary motion, this wheel 32 of beating is understood generation effects of beating.

Described compression part 4 is to cooperate a gasket ring 42 to be constituted by an elastomeric pad 41 that prebends distortion.

This output shaft 5 is a long column shape body, and be formed with a bulge loop 5a, one end of this output shaft 5 passes described compression part 4, beater mechanism 3 and switching part 2 in regular turn, the input wheels 11 that are connected described pedestal 1 again, make output shaft 5 can accept to import the drive of wheels 11 and rotate that the other end of this output shaft 5 then forms the end face structure that can install various machining tools; In addition, this wheel 32 of beating is installed on this output shaft 5.

Knob shell 6 has a perforation 6a for the center, and an end is a cylindrical hollow body of opening, its openend can be socketed on knob 24 outsides of described switching part 2, and make output shaft 5 can pass this perforation 6a but interfered by this bulge loop 5a and reach the restriction of axial location, and can be by rotating this knob shell 6 to drive this knob 24 rotations.

Aforesaid switching part 2 is a kind of mechanisms that can drive this knob 24 rotations carrying out switch speed file position by this knob shell 6.When this knob 24 rotates residing position, back in speed file position during non-last file bit position, this output shaft 5 can be subjected to the outside active force of the elastomeric pad 41 in this compression part 4, and the flange 24b in this knob 24 can not press described retainer spring 22, simultaneously, this retainer spring 22 is arranged in the inside of knob 24, and corrugated trough 31d (as shown in Figure 4) corresponding to directional wheel 31, under this state, because retainer spring 22 has flexible and elasticity, when so directional wheel 31 rotates with respect to output shaft 5, the circular arc crest of outer shroud 31c still can pass through retainer spring 22, make that the rotary freedom of directional wheel 31 is unaffected, thereby can rotate outputting power.In other words, in carrying out the drilling operation process, when the end face of output shaft 5 attaching tool is subjected to pressing strength, though the bulge loop 5a of output shaft 5 can produce an axial forces and act on the elastomeric pad 41 of compression part 4 and drive the wheel 32 of beating the convex side 31a engagement with this directional wheel 31 of contracing of drawing back, but the outer shroud 31c that is located at directional wheel 31 can rotate freely on output shaft, therefore, this wheel 32 of beating can keep engagement and the phenomenon that the field of conjugate action is beated and broken away from can not take place with directional wheel 31.

Again as shown in Figure 5, when knob 24 was turned to the file position of output impact power function, then the internal thread 24a by knob 24 pushed retainer spring 22 towards the direction of directional wheel 31, made retainer spring 22 insert in the trough 31d of directional wheels 31; Under this state, the rotary freedom of directional wheel 31 is restricted and can't rotates freely with respect to output shaft 5, and then makes the ratchet mechanism 31b generation effect of directional wheel 31, therefore can guarantee all can successfully file when switching gear at every turn.In other words, in impacting operation process, when the end face of output shaft 5 attaching tool is subjected to pressing strength, the bulge loop 5a of this output shaft 5 can produce an axial forces and act on the elastomeric pad 41 of compression part 4 and drive the wheel 32 of beating the convex side 31a engagement with directional wheel 31 of contracing of drawing back, 31 of directional wheels can be subjected to the fixing 31b of the ratchet portion effect of outer shroud 31c and can't rotate, relative motion can take place with two end faces of directional wheel 31 engagements in wheel 32 so this is beated, make and under the double wedge effect of this biend, produce the phenomenon of beating and breaking away from, produce axially outside intermittence impact strength so can drive output shaft 5, reach the function of impacting file.

The above only is in order to explain preferred embodiment of the present utility model; be not that attempt is done any pro forma restriction to the utility model according to this; so, all have following of identical spirit do relevant any modification or change, all should be included in the category of the utility model intention protection.

Claims (2)

1. electric tool PTO, include a pedestal, a switching part, a beater mechanism, a compression part, an output shaft, with a knob shell, described pedestal is driven by power and drives this output shaft and rotate;

Described switching part further includes one and switches seat, and the knob that is locked on this switching seat, and this switching seat is provided with a plurality of grooves of wearing, and this knob bottom has flange; This beater mechanism has activity and is combined in a directional wheel of this output shaft and is installed in the wheel of beating of one in this output shaft, the top end face of this directional wheel and this beat that the bottom surface of wheel forms respectively can intermeshing convex side, this directional wheel bottom installing one outer shroud, and the ratchet mechanism that is provided with rotation, it is characterized in that:

The described a plurality of grooves of wearing that switch seat have been inserted retainer spring respectively, and make this retainer spring enter the inside of this knob; The external diameter of described outer shroud forms waveform and crest and trough with a plurality of circular arcs, when this knob is rotated to non-impact gear, described retainer spring is positioned at the inside of this knob and does not embed the trough of this outer shroud, makes described directional wheel not be restricted with respect to the rotary freedom of output shaft; When this knob is rotated to the impact gear, then described retainer spring is subjected to this knob pushing and embeds in the trough of this outer shroud, make described directional wheel be restricted with respect to the rotary freedom of output shaft, thereby when the described wheel of beating produced relative rotary motion with directional wheel, this wheel of beating produced to beat and provide this output shaft to produce an axial intermittence and impacts strength.

2. electric tool PTO as claimed in claim 1 is characterized in that:

Described retainer spring is a kind of compression spring.

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