CN117428720A - Electric tool - Google Patents

Abstract

The invention relates to the technical field of electric tools, and provides an electric tool which aims at solving the problem that the electric tool in the prior art easily generates a jump gear when using a maximum set torque value, and comprises a gear box, a function switching structure and a pressure regulating structure, wherein an annular gear is arranged at one end in the gear box, the function switching structure is sleeved outside the gear box, the function switching structure comprises an impact ring, a function switching ring and a function switching knob for driving the function switching ring to rotate, and the pressure regulating structure comprises a pressure regulating knob, wherein: the function switching ring is sleeved on a first cylindrical surface of the gear box, and a limiting piece for controlling the function switching ring to move outwards along the axial direction of the first cylindrical surface of the gear box is further arranged on the first cylindrical surface of the gear box.

Description

Electric tool

Technical Field

The invention relates to the technical field of assembly tools, in particular to an electric tool.

Background

As a common decoration electric tool, currently, an electric drill has integrated three gears of a screw gear, an electric drill gear and an impact gear for convenience of use. When the electric tool is used by a user, the gear is switched by rotating the function switching knob on the electric tool, and the torque force can be adjusted by rotating the pressure adjusting knob.

Because the existing electric tool comprises a gear box, an inner gear ring, a function switching structure, a pressure regulating structure, a bearing front end cover and the like, wherein the function switching structure comprises a function switching knob, a function switching ring and an impact ring, a spring is arranged between the impact ring and the pressure regulating structure, one surface of the impact ring, which faces the inner gear ring, is provided with a plurality of protrusions, the top of each protrusion is provided with a steel ball, the inner gear ring is also provided with a plurality of protrusions with circular arcs, if the impact ring can axially move in the circumferential rotation process of the inner gear ring, when the protrusions on the inner gear ring slide over the steel balls on the protrusions on the impact ring, the steel ball part on the impact ring is propped up, the whole impact ring axially moves, and when the steel ball part rotates over the protrusions on the inner gear ring, the impact ring reversely bounces under the action of the spring, so that the impact ring can bounce once, and the inner gear ring is impacted once; if the impact ring is fixed in the axial direction, in the rotating process of the inner gear ring, when the protrusions on the inner gear ring are contacted with the steel balls on the protrusions of the impact ring, the protrusions of the inner gear ring are propped against the steel balls on the impact ring because the impact ring cannot move in the axial direction, and the protrusions and the steel balls reach the maximum contact ratio, so that the maximum set torque value is achieved. In the use process of the existing electric tool, the situation of gear jump is often easy when the maximum set torque value is used, the normal use of the electric tool is affected, and the working efficiency of a user is reduced.

Disclosure of Invention

The invention aims to provide an electric tool to solve the problem that the electric tool in the prior art is easy to jump gear when using the maximum set torque value.

The basic scheme provided by the invention is as follows: the utility model provides an electric tool, includes gear box, function switching structure and pressure regulation structure, and the one end in the gear box is provided with the ring gear, and gear box overcoat function switching structure, function switching structure include impact ring, function switching ring and drive function switching ring pivoted function switching knob, and pressure regulation structure includes pressure regulation knob, wherein: the function switching ring is sleeved on a first cylindrical surface of the gear box, and a limiting piece for controlling the function switching ring to move outwards along the axial direction of the first cylindrical surface of the gear box is further arranged on the first cylindrical surface of the gear box.

The basic scheme has the beneficial effects that: after analyzing the problem that the existing electric tool is easy to generate a jump gear when the existing electric tool is used for the maximum set torque value, the problem is found that the existing electric tool is characterized in that the function switching structure and the pressure regulating structure are switched and regulated in a rotating mode, so that a gap is reserved between the function switching structure and the pressure regulating structure in the axial direction in order to ensure that the function switching structure and the pressure regulating structure can smoothly rotate, moreover, the gap in the axial direction of the electric tool is enlarged due to the fact that the middle threads are generally trapezoidal threads, errors are generated due to the fact that a die, manufacturing, assembling and the like in the process of producing the electric tool, the gap in the axial direction of the electric tool is further enlarged, the gap in the axial direction between the annular gear and the impact ring is enlarged, the distance of axial movement of the impact ring is enlarged, the overlap of steel balls on the impact ring and the convex part of the annular gear ring is reduced, and the jump gear is generated.

Therefore, in the scheme, the mode of arranging the limiting piece on the first cylindrical surface of the gear box is adopted, the limiting piece control function is utilized to switch the annular axial movement, the mode of thread control is replaced, a series of axial gaps which are caused by the mode of thread connection and comprise axial gaps which are caused by assembly, manufacture, threads and the like can be avoided, so that the axial gaps between the annular gear and the impact ring can be ensured to be in a normal range, namely, when the maximum set torque value is reached, the maximum contact ratio of the protrusions of the annular gear and the protruding steel balls on the impact ring can be reached, the problem of gear jump when the maximum set torque value is used can be avoided, the normal use of the electric tool is ensured, and the working efficiency is improved.

Further, the pressure regulating structure comprises a pressure regulating spring, one end of the pressure regulating spring is arranged on the pressure regulating structure, and the other end of the pressure regulating spring abuts against the impact ring after penetrating through the limiting piece and the function switching ring. The beneficial effects are that: in this scheme, pass setting that pressure regulating spring and impact ring offset behind locating part and the function switching ring, make things convenient for pressure regulating spring at the inside installation of electric tool.

Further, the function switching ring outer circumference is provided with a plurality of first protrusions. The beneficial effects are that: in this scheme, the bellied setting of first provides the impetus for rotating the function switching ring, and the convenience is to the rotation of function switching ring, simple structure.

Further, the function switching knob is axially provided with a plurality of clamping grooves in interference fit with the first protrusions along the first cylinder of the gear box. The beneficial effects are that: in this scheme, the card that utilizes the card that sets up on the function switching knob is related to groove and the protruding interference fit's of first mode has realized on the one hand that the function switching knob drives the rotation of function switching ring, and on the other hand interference fit's mode can guarantee the zonulae occludens of function switching knob and function switching ring.

Further, the one side that the function switching ring kept away from the locating part is provided with a plurality of second archs along the circumference, and the impact ring corresponds the second arch and is provided with a plurality of first recesses. The beneficial effects are that: in this scheme, utilize the cooperation of second arch and first recess to realize the switching of gear, rotate to the function switching ring and can both realize boring or hammer drill's function to the arbitrary direction of controlling of second arch and first recess, and when the second arch corresponds with first recess, the function is the screw, and pressure regulation structure will play this moment, can adjust from small to big through pressure regulation knob, the torsion value of setting for is adjusted in segmentation.

Further, the inner circumference of the impact ring is radially provided with a plurality of third bulges, and the third bulges are provided with cylinders in one-to-one correspondence. The beneficial effects are that: in this scheme, the setting of protruding and cylinder makes things convenient for pressure regulating spring's setting, simple structure.

Further, the pressure adjusting structure comprises a pressure adjusting spring, and the pressure adjusting spring penetrates through the limiting piece and the function switching ring to be sleeved on the cylinder. The beneficial effects are that: in this scheme, cup joint pressure regulating spring on the cylinder, make things convenient for pressure regulating spring's connection, simple structure.

Further, a plurality of second grooves are axially formed in one end, facing the gear box seat, of the function switching knob, a rear reed is arranged on the gear box seat, and a protruding portion of the rear reed is inserted into the second grooves. The beneficial effects are that: in this scheme, under the gear state of difference, the bellying of back reed inserts in the second recess of difference, can realize the feedback that the gear was switched through the cooperation of the second recess that sets up and back reed bellying, and the operator can clearly know the gear and switch the result, and the result is operated.

Further, the circumference of the function switching ring and the circumference of the impact ring are provided with third grooves opposite to the second grooves. The beneficial effects are that: in this scheme, the setting of third recess makes things convenient for the cover of function switch knob on the gear box to establish.

Further, the front circumference and the front end face of the second cylindrical surface of the gear box are provided with bearings and a bearing front end cover for controlling the front circumference of the second cylindrical surface of the gear box and the movement of the bearings. The beneficial effects are that: in this scheme, utilize bearing front end housing control circumference size and bearing's removal, simple structure.

Further, the gear box seat is provided with a pressing plate, and the pressing plate is positioned on one side of the front end cover of the bearing, which is far away from the gear box seat. The beneficial effects are that: in this scheme, the setting of clamp plate can avoid the bearing front end housing directly to receive external impact to reduce the probability that the damage appears in the bearing front end housing, prolonged the life of bearing front end housing, can also prevent the outer removal of bearing.

Further, the pressing plate is provided with two fourth protrusions facing the gear box seat and controlling the circumferential rotation angle of the pressure adjusting knob. The beneficial effects are that: in this scheme, utilize two fourth archs that set up on the clamp plate can control pressure adjust knob's rotation angle, simple structure.

Further, the bearing front end cover and the pressing plate comprise five holes corresponding to screw holes at the front end of the second cylinder of the gear box. The beneficial effects are that: in this scheme, the setting of the individual hole that corresponds with the screw on the clamp plate can control the angle error of initial installation, and the setting of odd individual hole can prevent slow-witted moreover.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a power tool according to the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of the gearbox of FIG. 2;

FIG. 4 is a schematic view of the impact ring of FIG. 2;

FIG. 5 is a schematic view of the function switching ring of FIG. 2;

FIG. 6 is a schematic view of the function switching knob of FIG. 2;

FIG. 7 is a schematic view of the internal structure of FIG. 1;

FIG. 8 is a schematic view of the front end cap of the bearing of FIG. 2;

fig. 9 is a schematic structural view of a front reed of a front end cover of the bearing after installation;

FIG. 10 is a schematic view of the platen of FIG. 2;

FIG. 11 is a schematic view of the pressure adjustment knob of FIG. 2;

FIG. 12 is a schematic view of the structure of FIG. 2 after the front end cap and the pressure plate are connected;

FIG. 13 is a cross-sectional view B-B of FIG. 1;

FIG. 14 is a cross-sectional view of C-C of FIG. 1;

fig. 15 is a schematic view of the function switching ring of fig. 7 rotated.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: gearbox 1, draw-in groove 10, ring gear 11, back reed 14, function switch knob 2, second recess 20, card relate to groove 21, impact ring 3, third protruding 31, first recess 32, function switch ring 4, second protruding 41, first protruding 42, third recess 43, collar 5, pressure adjust knob 6, adjust recess 60, pressure adjust spring 61, pressure adjust seat 7, bearing front end housing 8, jack 80, clamp plate 9, fourth protruding 92, front reed 93.

An embodiment is substantially as shown in figures 1, 2 and 7 of the accompanying drawings: the utility model provides an electric tool, includes gear box 1, function switching structure and pressure regulation structure, and the overcoat of gear box 1 has the function switching structure, is provided with ring gear 11 in the gear box 1, and one terminal surface of ring gear 11 is provided with a plurality of archs, and the even interval is provided with 6 archs in the axial of the one end of ring gear 11 towards impact ring 3 in this embodiment, and bellied one end is circular-arc.

As shown in fig. 3-6, the function switching structure includes an impact ring 3, a function switching ring 4, and a function switching knob 2 for driving the function switching ring 4 to rotate, where the function switching ring 4 is sleeved on a first cylindrical surface of the gear case 1, a limiting member for controlling the function switching ring 4 to move axially outwards along the first cylindrical surface of the gear case 1 is further disposed on the first cylindrical surface of the gear case 1, and in this embodiment, the limiting member is a collar 5, or alternatively, the limiting member may also be a collar, etc., a clamping groove 10 is disposed on the gear case 1, and the collar 5 is disposed in the clamping groove 10.

The outer circumference of the function switching ring 4 is provided with a plurality of first bulges 42, the inner side of the function switching knob 2 is axially provided with a plurality of clamping grooves 21 in interference fit with the first bulges 42 along the first cylinder of the gear box 1, the function switching knob 2 drives the function switching ring 4 to rotate through the cooperation of the clamping grooves 21 and the first bulges 42, and particularly, the outer circumference of the function switching ring 4 is uniformly provided with three first bulges 42 at intervals, and correspondingly, the inner side of the function switching knob 2 is provided with three clamping grooves 21; the surface of the function switching ring 4, which is far from the collar 5, is provided with a plurality of second protrusions 41 along the circumferential surface, and the impact ring 3 is provided with a plurality of first grooves 32 corresponding to the second protrusions 41.

The function switching knob 2 is provided with a plurality of second grooves 20 in an axial direction toward one end of the gear case 1 seat, the gear case 1 seat is provided with a rear reed 14, and the protruding portion of the rear reed 14 is inserted into the second grooves 20 as shown in fig. 13. The circumference of the function switching ring 4 and the circumference of the impact ring 3 are each provided with a third groove 43 opposite to the second groove 20.

The inner circumference of the impact ring 3 is radially provided with a plurality of third bulges 31, the third bulges 31 are provided with cylinders in one-to-one correspondence, the other surface of the inner circumference of the impact ring 3 is provided with a plurality of steel balls, or the other surface of the inner circumference of the impact ring 3 is provided with a plurality of bosses, and one end of each boss, facing the annular gear 11, is provided with a steel ball.

As shown in fig. 7-12, the pressure adjusting structure comprises a pressure adjusting knob 6, a pressure adjusting spring 61 and a pressure adjusting seat 7, one end of the pressure adjusting spring 61 is arranged on the pressure adjusting seat 7, the other end of the pressure adjusting spring passes through a limiting piece and a function switching ring 4 and then abuts against the impact ring 3, specifically, a connecting column is arranged on the pressure adjusting seat 7, one end of the pressure adjusting spring 61 is sleeved on the connecting column, the other end of the pressure adjusting spring 61 passes through a clamping ring 5 and the function switching ring 4 to be sleeved on a cylinder on the impact ring 3, or connecting grooves are arranged at corresponding positions on the pressure adjusting seat 7 and the impact ring 3, and two ends of the pressure adjusting spring 61 are respectively arranged in the connecting grooves.

The front circumference and the front end face of the second cylinder face of the gear box 1 are provided with bearings and a bearing front end cover 8 for controlling the front circumference size of the second cylinder face and the movement of the bearings. The side of bearing front end housing 8 that keeps away from gear box 1 seat is provided with clamp plate 9, and clamp plate 9 is provided with two fourth protruding 92 towards gear box 1 seat and control pressure adjust knob 6 circumference rotation angle, is provided with the jack 80 that matches with fourth protruding 92 on the bearing front end housing 8. The bearing front end cap 8 and the pressing plate 9 comprise five holes corresponding to screw holes at the front end of the second cylinder of the gear box 1.

As shown in fig. 9, a front reed 93 is provided on the bearing front cover 8, a plurality of adjustment grooves 60 are provided on the inner wall of the pressure adjustment knob 6, and an adjustment protrusion of the front reed 93 is inserted into the adjustment groove 60, as shown in fig. 14.

The specific implementation process is as follows: when the function shift position is required to be switched to the screw shift position in use, the function switching knob 2 is rotated, the second protrusion 41 on the function switching ring 4 corresponds to the first groove 32 of the impact ring 3, as shown in fig. 7, so that in the rotation process of the ring gear 11, the protrusion on the ring gear 11 collides with the steel ball on the impact ring 3, at this time, because the second protrusion 41 on the function switching ring 4 corresponds to the first groove 32 of the impact ring 3, a moving space exists between the impact ring 3 and the function switching ring 4, the protrusion on the ring gear 11 extrudes the steel ball on the impact ring 3 to move outwards, and the impact ring 3 moves outwards, so that the protrusion on the ring gear 11 is separated from the surface of the steel ball on the impact ring 3, and the ring gear 11 continues to rotate circumferentially, thereby realizing the function of screwing.

When the function gear needs to be switched to the drill or hammer drill gear, as shown in fig. 15, the second protrusion 41 on the function switching ring 4 rotates to any direction from left to right with the first groove 32 of the impact ring 3, at this time, the second protrusion 41 on the function switching ring 4 is staggered with the first groove 32 of the impact ring 3, and the second protrusion 41 on the function switching ring 4 abuts against the circumferential surface of the impact ring 3, so that during the rotation of the ring gear 11, when the protrusion on the ring gear 11 collides with the steel ball on the impact ring 3, the function switching ring 4 cannot move outwards under the action of the collar 5, so as to abut against the movement of the impact ring 3, so that the protrusion on the ring gear 11 is abutted against the steel ball on the impact ring 3, and cannot continue to rotate, and the protrusion on the ring gear 11 and the steel ball on the impact ring 3 reach the maximum contact ratio, so as to realize the drill or hammer drill function.

In the above-mentioned process of switching the function shift, when the function switching knob 2 is turned, the protruding portion of the back reed 14 is inserted into the different second recess 20, and sounds are generated to prompt the user that the function shift is completed.

When the pressure gear is required to be switched, the pressure adjusting structure is effective at this time, and the set torsion value can be adjusted from small to large in a sectional mode through the pressure adjusting knob 6. When the set torque value is adjusted, the pressure adjusting knob 6 is turned, and the adjusting protrusion of the front reed 93 on the bearing front cover 8 is inserted into the different adjusting groove 60 on the pressure adjusting knob 6, so that the soft torque is adjusted from the minimum torque value to the maximum torque value, and a sound appears to prompt the user that the pressure adjustment is completed, as shown in fig. 14.

Taking soft torque as an example, in the screw gear, during the rotation of the pressure adjusting knob 6, the pressure adjusting spring 61 is gradually compressed, when the pressure adjusting spring 61 is compressed to the shortest, the impact ring 3 will receive the maximum acting force given by the pressure adjusting spring 61, so that the output of the maximum soft torque can be realized, and the power tool can reach the maximum soft torque.

The foregoing is merely an embodiment of the present invention, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present invention, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (13)

1. The utility model provides an electric tool, includes gear box, function switching structure and pressure regulation structure, the one end in the gear box is provided with the ring gear, the gear box overcoat function switching structure, function switching structure includes impact ring, function switching ring and drives function switching ring pivoted function switching knob, pressure regulation structure includes pressure regulation knob, its characterized in that: the function switching ring is sleeved on the first cylindrical surface of the gear box, and a limiting piece for controlling the function switching ring to move outwards along the axial direction of the first cylindrical surface of the gear box is further arranged on the first cylindrical surface of the gear box.

2. The power tool of claim 1, wherein: the pressure adjusting structure comprises a pressure adjusting spring, one end of the pressure adjusting spring is arranged on the pressure adjusting structure, and the other end of the pressure adjusting spring passes through the limiting piece and the function switching ring and then abuts against the impact ring.

3. The power tool of claim 1, wherein: the function switching ring is provided with a plurality of first protrusions on an outer circumference thereof.

4. A power tool according to claim 3, wherein: the function switching knob is axially provided with a plurality of clamping grooves in interference fit with the first protrusions along the first cylinder of the gear box.

5. The power tool according to any one of claims 1 to 4, wherein: the function switching ring is far away from one side of locating part is provided with a plurality of second archs along the circumference, the impact ring corresponds the second is protruding to be provided with a plurality of first recesses.

6. The power tool of claim 5, wherein: the impact ring inner circumference is provided with a plurality of third protruding along radial, the third protruding one-to-one is provided with the cylinder.

7. The power tool of claim 6, wherein: the pressure adjusting structure comprises a pressure adjusting spring, and the pressure adjusting spring penetrates through the limiting piece and the function switching ring to be sleeved on the cylinder.

8. The power tool of claim 7, wherein: the function switching knob is provided with a plurality of second grooves along the axial direction towards one end of the gear box seat, the gear box seat is provided with a rear reed, and the protruding part of the rear reed is inserted into the second grooves.

9. The power tool of claim 8, wherein: the circumference of the function switching ring and the circumference of the impact ring are provided with third grooves opposite to the second grooves.

10. The power tool of claim 9, wherein: the front circumference and the front end face of the second cylindrical surface of the gear box are provided with bearings and bearing front end covers for controlling the front circumference of the second cylindrical surface of the gear box and the movement of the bearings.

11. The power tool of claim 10, wherein: the gear box is characterized by further comprising a pressing plate, wherein the pressing plate is positioned on one side, far away from the gear box seat, of the front end cover of the bearing.

12. The power tool of claim 11, wherein: the pressing plate is provided with two fourth bulges which face the gear box seat and control the circumferential rotation angle of the pressure adjusting knob.

13. The power tool of claim 12, wherein: the bearing front end cover and the pressing plate comprise five holes corresponding to screw holes at the front end of the second cylinder of the gear box.