CN114074313A - Multifunctional percussion drill - Google Patents

Abstract

The invention discloses a multifunctional percussion drill, comprising: a motor, a housing assembly for supporting the motor; an output shaft capable of being driven by the motor to rotate around a first axis; an impact assembly, the impact assembly comprising: the fixed impact mechanism is at least partially fixedly connected with the shell assembly, is sleeved on the output shaft and limits the output shaft in the radial direction of the first axis; the dynamic impact mechanism can move along with the output shaft in the axial direction of the output shaft; the impact switching device has a first position that allows the dynamic impact mechanism to move in the axial direction of the first axis, and a second position that restricts the dynamic impact mechanism from moving in the axial direction of the first axis. The multifunctional impact drill supports the output shaft through the impact mechanism, so that the size of the multifunctional impact drill is reduced, and the portability of the multifunctional impact drill is improved.

Description

Multifunctional percussion drill

Technical Field

The invention relates to an electric tool, in particular to a multifunctional percussion drill.

Background

The multifunctional percussion drill can provide impact force, rotating force or impact rotating force simultaneously, so that the use requirements of users under different working conditions are met. In order to realize the above multiple functions of the multifunctional tool and switch among the multiple functions, the structure of the parts inside the multifunctional percussion drill is complicated. In particular, for a two-speed percussion drill, a reduction mechanism and a corresponding adjustment mechanism are required to adjust the output rotational speed. Traditional multi-functional impact is bored is unfavorable for multi-functional impact to be bored the promotion of portability, increases the tired sense that the user used, reduces work efficiency. How to reduce the size of the multifunctional percussion drill is a problem which is difficult to solve.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a multifunctional percussion drill, which supports an output shaft through a percussion mechanism, thereby reducing the size of the multifunctional percussion drill and improving the portability of the multifunctional percussion drill.

In order to achieve the above main object of the present invention, there is provided a multi-functional impact drill including: a motor, a housing assembly for supporting the motor; an output shaft capable of being driven by the motor to rotate around a first axis; an impact assembly, the impact assembly comprising: the fixed impact mechanism is fixedly connected with the shell assembly, is sleeved on the output shaft and limits the output shaft in the radial direction of the first axis; the dynamic impact mechanism can move along with the output shaft in the axial direction of the output shaft; the impact switching device has a first position that allows the dynamic impact mechanism to move in the axial direction of the first axis, and a second position that restricts the dynamic impact mechanism from moving in the axial direction of the first axis.

Optionally, the fixed impact mechanism comprises: the fixed impact teeth are fixedly connected with the shell assembly; the fixed conversion block is connected with the fixed impact teeth and the fixed conversion block is connected with the impact switching device; the dynamic impact mechanism includes: the dynamic impact teeth can move on the first axis along with the output shaft; and the movable conversion block is connected with the movable impact teeth, and is abutted against the fixed conversion block when the impact switching device is positioned at the second position.

Optionally, the dynamic conversion block is a bump formed on the end face of the dynamic impact tooth.

Optionally, drive mechanism connects motor and output shaft, and the housing assembly includes: a gear box, in which the transmission mechanism is disposed; the impact assembly is arranged in the front end shell, and the fixed impact teeth are fixedly connected with the front end shell; the main casing supports gear box, front end casing and motor.

Optionally, the fixed impact teeth comprise a fitting member, the fitting member being configured to be embedded in the front end housing; decide the conversion piece and include connecting portion, connecting portion stretch out and are connected to the impact auto-change over device from the front end casing.

Optionally, the fixed conversion block comprises a stop block, and the impact switching device can drive the stop block to rotate around the first axis when being switched to the first position and the second position; the movable conversion block comprises a convex block, and when the impact switching device is located at the second position, the convex block is abutted to the stop block.

Optionally, multi-functional impact drill includes the fore bearing, cup joints with the output shaft, and the fore bearing is set up in the front end casing, and the fore bearing is coaxial with the fixed impact tooth and is supported the output shaft jointly. The multifunctional percussion drill includes a sleeve disposed around at least a portion of the front bearing and the movable transition block and between the front bearing and the front end housing.

Alternatively, the fixed impact teeth are molded in the front end housing by powder metallurgy so that the fixed impact teeth and the front end housing are fitted. The length of the output shaft in the axial direction of the first axis is 40mm or more and 55mm or less.

Optionally, the distance between the front end of the front end housing and the rear end of the gear box on the first axis is greater than or equal to 55mm and less than or equal to 70 mm.

The invention has the advantages that:

the impact structure that multi-functional impact bored not only plays the impact action, and part strikes structure fixed connection casing to realize supporting location output shaft by impacting the structure, this kind of supported mode is reliable and stable, and reduces the inside part of multi-functional impact brill, has reduced the cost of manufacture, effectively reduces size and weight that multi-functional impact bored, and the multi-functional impact of user operation of being convenient for bores the operation.

Drawings

Fig. 1 is a perspective view of a multi-functional impact drill according to an embodiment of the present invention.

Fig. 2 is a sectional view of the multifunctional impact drill of fig. 1 of the present invention.

Fig. 3 is an exploded view of a portion of the multi-functional percussion drill of fig. 1 according to the present invention.

Fig. 4 is an exploded schematic view of the percussion assembly of the multi-function percussion drill of fig. 1 of the present invention.

Fig. 5 is a schematic structural view of a front end housing and a fixed striking mechanism of the multifunctional percussion drill of fig. 1 according to the present invention.

Fig. 6 is a schematic view showing a structure in which a constant impact mechanism of the multifunctional impact drill of fig. 1 of the present invention is mounted to a front end case.

Fig. 7 is a schematic sectional view of the constant impact mechanism of the multifunctional impact drill of fig. 6 of the present invention mounted to a front end housing.

Fig. 8 is an exploded view of the transmission mechanism of the multi-functional percussion drill of fig. 1 according to the present invention.

Fig. 9 is a sectional view of the multifunctional impact drill of fig. 1 of the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

The invention provides a multifunctional percussion drill 100, wherein the multifunctional percussion drill 100 at least can provide torque force to assist a screw to be driven into a workpiece and can provide impact force impact operation, and the impact function of the multifunctional percussion drill 100 can be operated to be started or stopped so as to meet different use requirements of users.

Referring to fig. 1 and 2, the multi-functional impact drill 100 includes a motor 110, a housing assembly 120, an output shaft 130, and an impact assembly 200, the motor 110 being disposed within the housing assembly 120, the motor 110 being supported by the housing assembly 120. The motor 110 can drive the output shaft 130 to rotate around the first axis 101, and the tail end of the output shaft 130 is provided with a working head, so that the output shaft 130 can drive the workpiece to rotate to realize a screwdriver function. The impact assembly 200 can drive the output shaft 130 to perform an impact motion along the direction of the first axis 101, so that the multifunctional impact drill 100 can perform an impact wrench function. The impact switching device 140 is connected with the impact assembly 200, and the impact switching device 140 is used for switching on and off the impact function of the multifunctional impact drill 100.

Referring to fig. 2, the motor 110 has a motor shaft that rotates along the first axis 101, and the multifunctional percussion drill 100 further includes a transmission assembly 150, the transmission assembly 150 connects the motor shaft and the output shaft 130, and the motor 110 drives the output shaft 130 to rotate through the transmission assembly 150.

Referring to fig. 2 and 9, the housing assembly 120 includes a gear case 121, a front end housing 122, and a main housing 123. The transmission assembly 150 is disposed within the gear housing 121. The impact assembly 200 is disposed within the front housing 122. The main housing 123 supports the gear case 121, the front end housing 122, and the motor 110.

Referring to fig. 3 and 4, the fixed impact mechanism 210 includes a fixed impact mechanism 210 and a movable impact mechanism 220, the fixed impact mechanism 210 is fixedly connected to the housing assembly 120, and the fixed impact mechanism is sleeved on the output shaft 130 and limits the output shaft 130 in the radial direction of the first axis 101.

The dynamic impact mechanism 220 can move with the output shaft 130 in the axial direction of the output shaft 130. The impact switching device 140 has a first position that allows the dynamic impact mechanism 220 to move in the axial direction of the first axis 101 and a second position that restricts the dynamic impact mechanism 220 from moving in the axial direction of the first axis 101 to achieve the impact function of turning on or off the multi-function impact drill 100. The impact switch device 140 is sleeved on the front end housing 122 and located at the periphery of the front end housing 122 for user operation, so as to switch the impact switch device 140 to the first position or the second position. Alternatively, the user may operate the impact switch 140 to rotate about the first axis 101 to turn on or off the impact function of the multi-function impact drill 100.

The fixed impact mechanism 210 includes a fixed impact tooth 211 and a fixed conversion block 212, the fixed impact tooth 211 is fixedly connected with the housing assembly 120, the fixed conversion block 212 is connected with the fixed impact tooth 211, and the fixed conversion block 212 is connected with the impact switching device 140. The dynamic impact mechanism 220 includes dynamic impact teeth 221 and a dynamic conversion block 222, and the dynamic impact teeth 221 can move along with the output shaft 130 on the first axis 101. The fixed impact teeth 211 and the output shaft 130 are in close clearance fit, and the output shaft 130 can rotate around the first axis 101 and reciprocate along the axial direction of the first axis relative to the fixed impact teeth 211.

Referring to fig. 4 and 5, the fixed impact teeth 211 include a base plate 216 and a meshing portion 217, the base plate 216 and the meshing portion 217 centrally form a shaft hole through which the output shaft 130 passes, and the output shaft 130 is movable relative to the fixed impact teeth 211 along the axial direction of the first axis 101, that is, the fixed impact teeth 211 are stationary in the axial direction when the output shaft 130 performs reciprocating impact motion along the first axis 101. The base plate 216 is directly connected to the front end housing 122, and the engaging portion 217 is adapted to engage with the dynamic impact teeth 221. The bottom plate 216 and the engaging portion 217 extend in a plane perpendicular to the first axis 101, on which plane the cross-sectional diameter of the bottom plate 216 is larger than the cross-sectional diameter of the engaging portion 217, so that the bottom plate 216 and the engaging portion 217 constitute a stepped structure. The fixed switching block 212 includes a ring body and a connecting portion 214 disposed at one side of the ring body, and the connecting portion 214 extends from the front end housing 122 and is connected to the impact switching device 140. The ring body is sleeved on the periphery of the engaging portion 217, a stop block 215 is arranged on the periphery of the ring body, optionally, the stop block 215 may be provided in plurality, and the stop blocks 215 are arranged with a certain interval therebetween.

The user can operate the position of the impact switch 140, and when the impact switch 140 is operated to switch between the first position and the second position, the impact switch 140 moves the fixed impact block through the connecting portion 214. Optionally, the impact switch 140 is a collar disposed on the periphery of the front housing 122, and a user can rotate the collar around the first axis 101 to switch the first position and the second position of the impact switch 140, so as to drive the fixed switch block 212 to rotate around the first axis 101 by a certain angle, so that the stop block 215 can rotate around the first axis 101 by a certain angle.

Referring to fig. 4 to 7, the fixed impact teeth 211 are disposed inside the front end housing 122 and fixedly connected to the front end housing 122. The side surface of the base plate 216 of the fixed impact teeth 211 is formed with a fitting piece 213, and the fitting piece 213 is provided in the circumferential direction of the side surface of the base plate 216 and protrudes relative to the side surface of the base plate 216. The front end housing 122 forms a mounting chamber 1221 for accommodating the fixed striking mechanism 210, the mounting chamber 1221 fixing the fixed striking teeth 211. The mounting chamber 1221 creates a fitting groove 1222 for mounting the fitting 213. The fixed impact teeth 211 are inserted into the installation chamber 1221 formed by the front end housing 122 through a powder metallurgy manufacturing process during manufacturing, so that the fixed impact teeth 211 are fixedly connected to the front end housing 122, and the inserting piece 213 is inserted into the front end housing 122 to prevent the fixed impact teeth from being separated from the front end housing 122. The materials of the fixed impact teeth 211 and the front housing 122 may be different, for example, the fixed impact teeth 211 are made of metal, and the front housing 122 is made of plastic.

Alternatively, the fixed impact teeth 211 and the front end housing 122 are integrally formed, and the fixed impact teeth 211 and the front end housing 122 are integrally formed by molding, so that the fixed impact teeth 211 are fixedly supported by the front end housing 122. The size of the shaft hole of the fixed impact mechanism 210 is matched with the size of the output shaft 130, and the fixed impact teeth 211 support the output shaft 130.

Referring to fig. 3, the multifunctional percussion drill 100 further includes a front bearing 160, the front bearing 160 is sleeved with the output shaft 130, the front bearing 160 is disposed in the front end housing 122, and the front bearing 160 and the fixed percussion tooth 211 are coaxially disposed and jointly support the output shaft 130. By the structure of the fixed impact teeth 211, the positioning of the output shaft 130 in the axial direction can be realized only by designing one front bearing 160 as a bearing matched with the fixed impact teeth 211. The overall size of the impact assembly 200 may thereby be effectively reduced, enabling the corresponding size of the front housing 122 to be reduced. Referring to fig. 9, with the above configuration, the distance L1 between the front end of the front end housing 122 and the rear end of the gear case 121 on the first axis 101 can be 55mm or more and 70mm or less. The length L2 of the output shaft 130 in the axial direction of the first axis can be reduced such that L2 is 40mm or more and 55mm or less.

In one embodiment, the fixed impact teeth 211 are directly fixed to the housing assembly 120, such as directly to the main housing 123, and also to the output shaft 130.

The dynamic impact teeth 221 and the output shaft are stamped or flat connected so that the dynamic impact teeth 211 and the output shaft can move synchronously. The dynamic impact teeth 221 include an impact portion disposed opposite the mesh portion 217, and both the impact portion and the mesh portion 217 are configured as tooth-shaped protrusions. The dynamic conversion block 222 is connected with the dynamic impact teeth 221 and can synchronously reciprocate along the direction of the first axis 101. The dynamic transformation block 222 forms a projection 223, the projection 223 extending in the direction of the fixed striking tooth 211 relative to the dynamic striking tooth 221, and in this direction, the projection 223 at least partially protrudes beyond the dynamic striking tooth 221. The dynamic conversion block 222 and the dynamic impact teeth 211 have a certain gap, so that the dynamic impact teeth 211 can rotate relative to the dynamic conversion block 222, and the dynamic impact block 222 is connected with the output shaft and can move in the axial direction of the first axis synchronously with the output shaft.

The projection 223 cooperates with the stop block 215, when the impact switching device 140 is located at the first position, the stop block 215 is located at the unlocking position, and the stop block 215 and the dynamic impact tooth 221 are arranged in a staggered manner in the circumferential direction of the first axis 101, that is, when the dynamic impact mechanism 220 impacts the fixed impact mechanism along the first axis 101, the projection 223 is driven to impact the stop block 215 side until the impact portion of the dynamic impact tooth 221 strikes the meshing portion 217 of the fixed impact tooth 211. At this time, the impact function of the multi-functional impact drill 100 is turned on. When the impact switch device 140 is in the second position, the stop block 215 is in the locking position, and the projection 223 can abut against the stop block 215 to prevent the impact action of the percussion mechanism 220 in this direction, and the impact function of the multifunctional percussion drill 100 is turned off.

In one embodiment, the dynamic transformation block 222 and the dynamic impact tooth 221 are integrally formed, and the dynamic transformation block 222 is a convex block formed on the end surface of the dynamic impact tooth 221. The projection extends in the direction of the fixed striking tooth 211 relative to the movable striking tooth 221 and in this direction it at least partially extends beyond the movable striking tooth 221. Such dynamic impact mechanisms may shorten the overall length of the impact assembly. When the dynamic impact tooth 221 impacts the fixed impact mechanism, the position of the fixed impact tooth determines whether the impact part can contact the meshing part, when the fixed conversion block is driven to rotate to enable the fixed conversion block and the convex block to be overlapped in projection on a straight line parallel to the first axis, the fixed conversion block is abutted with the convex block to prevent the fixed impact block from impacting the fixed impact block, and therefore the impact function of the multifunctional impact drill is stopped.

Referring to FIG. 3, the multi-function hammer drill 100 further includes a sleeve 170, the sleeve 170 being disposed about at least a portion of the front bearing 160 and the dynamic switching block 222 and between the bearing and the front end housing 122. The sleeve 170 is used for supporting and limiting the front bearing 160, small clearance fit is formed among the sleeve 170, the front bearing 160 and the dynamic impact teeth 221, the sleeve 170 can protect the front end shell 122, and abrasion of the dynamic conversion block 222 and the front bearing 160 to the front shell is reduced. Optionally, the sleeve is sleeved around only the front bearing 160 and is disposed between the front bearing and the front end housing.

Referring to fig. 2 and 8, the transmission assembly 150 includes a planetary gear set 151, the planetary gear set 151 including an inner gear 152 and planetary gears, the inner gear 152 being provided with a convex tooth 153 at a side facing the impact assembly 200. The planetary gear set 151 includes a primary planetary gear set including a primary planet carrier, a primary ring gear, and a plurality of planet gears engaged with a sun gear connected to the motor shaft, and the planet gears supported by the primary planet carrier and installed in the primary ring gear.

The secondary gear set comprises a secondary planet carrier, a secondary inner gear ring and a plurality of planet wheels, the plurality of planet wheels of the secondary gear set are meshed with one end of the primary planet carrier, the planet wheels are mounted on the secondary planet carrier and meshed in the secondary inner gear ring, the plurality of planet wheels can drive the secondary inner gear ring to rotate, the secondary planet carrier is connected with the output shaft 130, and the secondary planet carrier can be driven to rotate so as to drive the output shaft 130 to rotate and output. The speed reduction of the rotating speed of the motor shaft is realized through the planetary wheel set. The transmission assembly 150 further includes a speed adjusting member connected to the first-stage ring gear so as to switch the position of the first-stage ring gear, so that the first-stage ring gear can be simultaneously engaged with the planet gears and the first-stage planet carrier, or separately engaged with the planet gears, thereby changing the reduction ratio that the transmission assembly 150 can provide and realizing the adjustment of the rotating speed and the torque of the output shaft 130. Optionally, the planetary gear set 151 further includes three planetary gear sets connected to the first and second planetary gear sets, so that the transmission assembly 150 can provide a higher reduction ratio.

Referring to fig. 3 and 8, the multi-functional impact drill 100 further includes an elastic member 155, the elastic member 155 being disposed in the front end housing 122 and connecting the dynamic impact mechanism 220 and the fixed impact mechanism 210, the elastic member 135 being disposed between the fixed impact mechanism 210 and the dynamic impact mechanism 220. The elastic element 155 can move the impact assembly 200 along the axis of the first axis 101. The working head abuts against the workpiece and can be driven to move upwards, the elastic element 155 is compressed, after the working head is released, the elastic element 155 is reset to drive the impact structure to move downwards, and the downwards direction is the direction along the axial direction of the first axis 101 and towards the working head of the output shaft 130. Thereby achieving the reciprocating movement of the dynamic impact mechanism 220 in the axial direction of the first axis 101.

The multifunctional impact drill 100 according to the present invention is suitable for an electric tool capable of switching a rotation function, an impact function, and both the rotation function and the impact function, and can make the internal structure of the tool compact and reduce the cost.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (10)

1. A multi-function percussion drill comprising:

a motor is arranged on the base plate and is provided with a motor,

a housing assembly for supporting the motor;

an output shaft drivable by the motor to rotate about a first axis;

an impact assembly, characterized in that the impact assembly comprises:

the fixed impact mechanism is at least partially fixedly connected with the shell assembly, is sleeved on the output shaft and limits the output shaft in the radial direction of the first axis;

a dynamic impact mechanism movable with the output shaft in an axial direction of the output shaft;

an impact switch device having a first position that allows movement of the dynamic impact mechanism in an axial direction of the first axis, and a second position that restricts movement of the dynamic impact mechanism in the axial direction of the first axis.

2. The multi-function percussion drill according to claim 1, wherein:

the fixed impact mechanism includes:

the fixed impact teeth are fixedly connected with the shell assembly;

the fixed conversion block is connected with the fixed impact teeth and is connected with the impact switching device;

the dynamic impact mechanism includes:

a dynamic impact tooth movable with the output shaft on the first axis;

and the movable conversion block is connected with the movable impact teeth, and is abutted against the fixed conversion block when the impact switching device is positioned at the second position.

3. The multi-function percussion drill according to claim 2, wherein: the dynamic conversion block is a convex block formed on the end face of the dynamic impact tooth.

4. The multi-function percussion drill according to claim 2, comprising:

the transmission mechanism is connected with the motor and the output shaft;

the housing assembly includes:

a gearbox within which the drive mechanism is disposed;

the impact assembly is arranged in the front end shell, and the fixed impact teeth are fixedly connected with the front end shell;

a main housing supporting the gear box, the front end housing and the motor.

5. The multi-function percussion drill according to claim 4, wherein:

the fixed impact teeth comprise embedded pieces which are arranged to be embedded into the front end shell to prevent the fixed impact teeth from being separated from the front end shell;

decide the conversion piece and include connecting portion, connecting portion certainly the front end casing stretches out and is connected to strike auto-change over device.

6. The multi-function percussion drill according to claim 5, wherein:

the fixed conversion block comprises a stop block, and the impact switching device can drive the stop block to rotate around the first axis when being switched to a first position and a second position;

the movable conversion block comprises a convex block, and when the impact switching device is located at the second position, the convex block is abutted to the stop block.

7. The multi-function percussion drill according to claim 4, comprising:

the front bearing is sleeved with the output shaft and arranged in the front end shell, and the front bearing and the fixed impact teeth are coaxially arranged and jointly support the output shaft;

a sleeve disposed about at least a portion of the front bearing and the movable transition block and between the front bearing and the front end housing.

8. The multi-function percussion drill according to claim 4, wherein:

the fixed impact teeth are molded in the front end housing by powder metallurgy such that the fixed impact teeth and the front end housing are fitted.

9. The multi-function percussion drill according to claim 4, wherein:

the length of the output shaft in the axial direction of the first axis is 40mm or more and 55mm or less.

10. The multi-function percussion drill according to claim 4, wherein:

the distance in the axial direction of the first axis from the front end of the front end housing to the rear end of the gear case is 55mm or more and 70mm or less.

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