CN110561350B

CN110561350B - Electric hammer

Info

Publication number: CN110561350B
Application number: CN201910802963.6A
Authority: CN
Inventors: 金红霞; 李坚忠
Original assignee: Zhejiang Xinyuan Electric Appliance Manufacture Co ltd
Current assignee: Zhejiang Xinyuan Electric Appliance Manufacture Co ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2020-09-11
Anticipated expiration: 2039-08-28
Also published as: WO2021036095A1; CN110561350A

Abstract

The invention discloses an electric hammer, which comprises a rotor mandrel, a rotor punching sheet, a rotor spacer bush, fan blades, magnetic steel and a balance ring, wherein the rotor punching sheet is arranged on the rotor mandrel; the rotor punching sheet is fixedly connected with the rotor mandrel, the fan blades are connected with one end, close to the output shaft, of the rotor punching sheet, the magnetic steels are placed in magnetic steel grooves of the rotor punching sheet according to the polarity sequence, the part, exceeding the height of the rotor punching sheet, of the magnetic steels is provided with a rotor spacer bush, and the balance ring is arranged at one end of an open ring of the rotor punching sheet; the invention provides the electric hammer which has simple and reasonable structure, can improve the product positioning precision and save the cost in the operation work, and can improve the convenience and the working efficiency of the magnetic steel.

Description

Electric hammer

Technical Field

The invention relates to the field of electric tools, in particular to an electric hammer.

Background

The existing rechargeable electric hammer is basically 12V and has a Harvard structure, the motor is also basically a brush motor, the swing rod bearing is 16.5 degrees, the diameter of the cylinder is basically 17mm, and the battery pack is basically 3 strings in series and parallel. Although the machine body is light and light, the drilling rate is low, the battery endurance is also low, and the machine body is only suitable for household users; simultaneously, the existing rechargeable electric hammer has the defects that the noise is large when the hammer is empty, oil leakage easily occurs to the casing, and the actual experience effect of the product is influenced.

Disclosure of Invention

The electric hammer overcomes the defects of the prior art, has a simple and reasonable structure, obviously improves the cruising ability, and improves the hammering effect of the whole machine.

The technical scheme of the invention is as follows:

an electric hammer comprises an electric tool body, a bracket, a swing rod bearing transmission structure, a brushless motor and a battery pack; the bracket is arranged in the electric tool body, and the brushless motor and the battery pack are respectively arranged on two sides of the bracket; a through hole is formed in the middle of the bracket and is used for a gear of the brushless motor to pass through, and a placing hole is formed below the through hole and used for a swing rod bearing transmission structure to pass through; the swing rod bearing transmission structure is meshed with the brushless motor.

Furthermore, the swing rod bearing transmission structure comprises a swing rod bearing, a clutch, an intermediate shaft and a cylinder; one side of the swing rod bearing is connected with the clutch; the middle shaft penetrates through the swing rod bearing, one end of the middle shaft is connected with the brushless motor through the first-stage driven wheel, and the other end of the middle shaft is connected with the clutch; the cylinder is connected with the swing rod bearing.

Furthermore, the swing rod bearing comprises an outer ring, a steel ball and an inner ring, wherein the steel ball is arranged between the outer ring and the inner ring and is in contact with the outer ring and the inner ring; grooves are arranged on one side of the outer ring close to the inner ring and one side of the inner ring close to the outer ring, and the shapes of the grooves are adapted to the steel balls; the outer ring forms an angle of 18-20 degrees with the horizontal direction.

Further, the outer ring comprises a swing rod and an outer ring body, and the thickness of the outer ring body is larger as the outer ring body is closer to the swing rod; a transition part is arranged at the joint of the oscillating bar and the outer ring body, and the transition part adopts a circular arc shape and has a thickness larger than the thickness of other parts of the outer ring body;

the inner ring comprises an inner ring body, a driving key and a connecting part, and the driving key and the connecting part are oppositely arranged on two sides of the inner ring body; the inner ring body is spherical and is provided with a through hole, and the through hole passes through the centers of the inner ring body, the drive key and the joint part; the driving key comprises an annular wafer and two driving columns, and the two driving columns are oppositely arranged on the annular wafer; the connection part is in a circular column shape; the engaging part is contacted with a clutch groove of the clutch, and the shape of the clutch groove is matched with that of the engaging part.

Furthermore, one end of the swing rod bearing transmission structure, which is far away from the brushless motor, is provided with a shifting block passive reset structure, which comprises a shifting block, a reset spring and a fixing piece; the reset spring is arranged between the shifting block and the fixing piece; the shifting block is provided with a convex block for connecting and fixing the return spring, and the fixing piece is provided with a groove for placing the return spring; a guide groove and a guide column are arranged between the shifting block and the fixing piece, and a guide angle is arranged at one end, close to the guide groove, of the guide column.

Further, the device also comprises a knob, wherein the knob controls the shifting block; a control lug is arranged on the knob, and a protrusion which is matched with the control lug is arranged on the shifting block; the knob comprises a knob body, a connecting spring and a clamping piece; a clamping piece is arranged in the knob body, and the clamping piece and the knob body piece are provided with a connecting spring; the control lug is cylindrical, and the protrusion is flaky.

Furthermore, an air duct is arranged on the bracket and is arranged at the upper end of the bracket; the air passage comprises a main air passage and a side vent hole, and the main air passage is communicated with the side vent hole; the main ventilation channel comprises a tip part, a communication part, a connecting part and a filtering placing part; the tip part is integrally conical, the communicating part and the filtering placing part are cylindrical, the diameter of the filtering placing part is larger than that of the communicating part, and the communicating part is connected with the filtering placing part through a connecting part; wherein, the diameter that the linking part is close to filtering the standing part is the biggest, and the diameter that the linking part is close to the intercommunication portion is the minimum.

Furthermore, a filtering device is arranged on the air passage; the filtering device adopts a filter screen which is cylindrical as a whole; and a positioning baffle is arranged on the electric tool body corresponding to the filtering device.

Furthermore, the battery assembly comprises a first battery assembly and a second battery assembly, the first battery assembly is electrically connected with the second battery assembly, and the end part of the second battery assembly is inserted and fixedly installed in the first battery assembly;

furthermore, the first battery assembly and the second battery assembly are mutually and vertically connected, the first battery assembly is arranged in a row shape, and the second battery assembly is arranged in a barrel shape;

further, the first battery component comprises a base, a base cover and a lower battery pack, the lower battery pack is fixedly arranged in the base, and the base cover is fixedly arranged on the base; a battery mounting groove is formed in the upper end face of the base cover, a second battery assembly is fixedly mounted in the battery mounting groove, and the second battery assembly is connected with the lower battery pack;

furthermore, the second battery component comprises a battery sleeve, a battery upper end plate, an electric guide plate, a battery lower end plate and a battery, the electric guide plate is arranged on the battery upper end plate, the battery upper end plate and the battery lower end plate are fixedly arranged at two ends of the battery to form an upper battery pack, the upper battery pack is fixedly connected with the first battery component, and the battery sleeve is sleeved outside the upper battery pack; a second electric conducting sheet is fixedly arranged on the lower end plate of the battery, and the second electric conducting sheet is connected with the first battery component; the battery upper end plate comprises a battery frame, the battery frame is fixedly connected with the battery, a third electric conduction piece is arranged in the battery frame and fixedly connected with the electric conduction plate, and the third electric conduction piece is connected with the upper battery pack.

Further, the brushless motor comprises a rotor mandrel, rotor punching sheets, a rotor spacer bush, fan blades, magnetic steel and a balance ring; the rotor punching sheet is fixedly connected with the rotor mandrel, the fan blades are connected with one end, far away from the balance ring, of the rotor punching sheet, the magnetic steels are placed in magnetic steel grooves of the rotor punching sheet according to the polarity sequence, the part, exceeding the height of the rotor punching sheet, of the magnetic steels is provided with a rotor spacer bush, and the balance ring is arranged at one end of an open loop of the rotor punching sheet; the sizes and the positions of the fan blades and the rotor punching sheet are matched with the positioning gear on the rotor mandrel;

the N pole of the magnetic steel groove of the rotor punching sheet adopts a regular structure, and the S pole of the magnetic steel groove of the rotor punching sheet adopts an irregular structure; or on the contrary, the S pole of the magnetic steel groove of the rotor punching sheet adopts a regular structure, and the N pole of the magnetic steel groove of the rotor punching sheet adopts an irregular structure; the shape of the magnetic steel is matched with that of a magnetic steel groove of the rotor punching sheet; the size of the magnetic steel is larger than that of the rotor punching sheet; the regular structure is arc-shaped, the irregular structure is two straight edges, and the included angle of the two straight edges is 135-160 degrees.

Compared with the prior art, the invention has the advantages that:

the shifting block and the fixing piece are kept at a certain distance through the reset spring, the hammer drill on the other side of the shifting block cannot be attached to the positioning piece through the shifting block, and the hammer drill only rotates and does not hammer. The design of shifting block and mounting plays supplementary limiting displacement, makes and can not take place to drop between shifting block and the mounting, the skew. The knob body is provided with the control lug, and the control lug is loosened or fixed through the clamping piece, so that the knob can be easily rotated to a corresponding position. The rotating sleeve structure is connected with the shifting block, the shifting block is arranged at one end of the rotating sleeve structure close to the fixing part, and the fixing part is also sleeved and fixed on the rotating sleeve structure. The lower part of the shifting block is connected with a clutch, the clutch is contacted with a swing rod bearing, and a swing rod on the swing rod bearing is connected with a rotating sleeve structure. When the electric hammer is started for standby operation, the shifting block is pushed open by the reset spring and drives the rotating sleeve structure and the clutch to move outwards, at the moment, the clutch driving groove and the swing rod bearing driving key are in a separation state, and the swing rod bearing does not work; the rotary sleeve structure only rotates and does not generate hammering, and the whole machine does not generate noise of an empty hammer.

The rotor punching structure of the scheme is compatible with the advantages of embedded and surface-mounted structures on the market, so that the manufacturing process is simple, the utilization rate of magnetic steel performance is high, and the overall performance of the motor is improved. The rotor punching sheet design can improve the convenience and the working efficiency in work, fully play the performance of magnetic steel and play a foolproof role in the production and manufacturing process.

A series of problems caused by inconsistent stack heights of rotor punching sheets are solved through the rotor spacer bush. The balance ring is arranged at one end of the open ring of the rotor punching sheet, only one balance ring is adopted, the whole balance ring is a step-shaped circular ring column, a cylindrical through hole is arranged in the middle of the balance ring, the size of the through hole is matched with that of the rotor core shaft, and the effect of sealing and fastening one end of the open ring of the rotor punching sheet is achieved. The special arrangement position of a fan blade replaces the traditional fan blade and balance ring, so that the fan blade not only plays a role in cooling and heat dissipation, but also plays a role in punching press mounting size positioning and balance ring, and the overall manufacturing cost is greatly reduced.

This scheme is whole to fall into two parts with the electric tool body through the support, and the electric tool body front portion is whole to reach sealed effect to only carry out the UNICOM in two parts spaces that the electric tool body was cut apart through the air vent, realize the pressure release, reduce because the interior pressure that the cylinder motion in the electric tool body produced reaches and reduces inside and outside pressure difference effect, avoids lubricating oil outside seepage when the electric tool function. The special structure setting of air vent forms quick pressure release passageway, and the tip realizes leading the air space, avoids the circulation of air slow. The communication part, the connection part and the filtering placement part gradually enlarge the channel of the main ventilation channel, so that the hot air dissipation is facilitated, and the local overlarge heat is avoided. The side vent holes are integrally in a round table shape and are communicated with the communication part of the main ventilation channel, so that hot air can be discharged as soon as possible.

This scheme battery pack includes two-layer upper and lower electric core and constitutes, and the upper strata is erected and is arranged, and the lower floor is violently arranged, realizes four cluster two and connect through connecting the nickel piece, and battery package capacity is more conventional three cluster in the lump and four cluster increase more than the one time in the lump, and duration increases obviously. Install in lower floor's battery pack through the tip with upper battery pack, improve the holistic intensity of this group battery, satisfy the higher operation requirement of instrument.

Drawings

FIG. 1 is a block diagram of a rotor spindle of the present invention;

FIG. 2 is a cross-sectional view of a rotor spindle of the present invention;

FIG. 3 is a cross-sectional view of a rotor plate of the present invention;

FIG. 4 is a cross-sectional view of a conventional rotor plate;

FIG. 5 is a clutch structure view of the present invention;

FIG. 6 is a schematic view of a wobble shaft bearing of the present invention;

FIG. 7 is a view of the pendulum bearing drive configuration of the present invention;

FIG. 8 is a cross-sectional view of the inner race of the present invention;

FIG. 9 is a cross-sectional view of a wobble shaft bearing of the present invention;

FIG. 10 is an overall block diagram of the clutch of the present invention disengaged from the rocker bearing;

FIG. 11 is an overall view of the clutch of the present invention in combination with a rocker bearing;

FIG. 12 is a schematic view of a fastener of the present invention;

FIG. 13 is a schematic view of a paddle of the present invention;

FIG. 14 is a view of the knob structure of the present invention;

fig. 15 is a schematic structural view of a battery pack according to the present invention.

FIG. 16 is a schematic view of the structure of FIG. 15 after being rotated by a certain angle;

FIG. 17 is a schematic view of the base cover of FIG. 16 shown with the base cover removed;

fig. 18 is a schematic structural view of a lower battery pack according to the present invention;

FIG. 19 is a schematic view of the battery case of FIG. 16 shown without the battery case;

fig. 20 is a schematic view of a second battery module of the present invention with the battery cover removed;

FIG. 21 is a structural view of a rotor spindle of the present invention;

FIG. 22 is a cross-sectional view of a rotor spindle of the present invention;

FIG. 23 is a cross-sectional view of a rotor plate of the rotor spindle of the present invention;

the figure is marked with: 1-1 part of outer ring, 1-11 parts of swing rod, 1-12 parts of outer ring body, 1-2 parts of retainer, 1-3 parts of inner ring, 1-31 parts of inner ring body, 1-32 parts of driving key, 1-33 parts of connecting part, 1-4 parts of steel ball, 1-5 parts of clutch, 1-51 parts of clutch groove, 1-6 parts of intermediate shaft, 1-7 parts of brushless motor, 1-8 parts of cylinder, 1-81 parts of piston, 1-82 parts of rubber ring, 1-9 parts of primary driven wheel, 2-1 parts of shifting block, 2-1 parts of reset spring, 3 parts of convex block, 4 parts of groove, 5 parts of fixing part, 6 parts of guide groove, 7 parts of guide column, 8 parts of knob, 81 parts of knob body, 82 parts of connecting spring, 83 parts of clutch, 1-5 parts of swing rod bearing 10 parts of swing rod bearing, 11 parts of rotary sleeve, 3-21 parts of through holes, 3-22 parts of placement holes, 3-3 parts of main ventilation channels, 3-31 parts of tip parts, 3-32 parts of communication parts, 3-33 parts of connecting parts, 3-34 parts of filter placement parts, 3-4 parts of side ventilation holes, 3-5 parts of sealing rings, 3-6 parts of positioning baffle plates, 4-1 parts of first battery components, 4-2 parts of second battery components, 4-3 parts of base covers, 4-4 parts of bases, 4-5 parts of lower battery packs, 4-6 parts of battery installation grooves, 4-7 parts of batteries, 4-8 parts of battery installation frames, 4-9 parts of first conductive sheets, 4-10 parts of clamping grooves, 4-11 parts of battery sleeves, 4-12 parts of lower battery end plates, 4-13 parts of upper battery end plates, 4-14 parts of second conductive sheets, 4-15 parts of battery frames, 4-, 4-17 parts of a third electric conducting sheet, 4-18 parts of a reed, 4-19 parts of a connecting terminal, 4-20 parts of an inserting sheet, 4-21 parts of a first battery pack, 4-22 parts of a second battery pack, 4-23 parts of a third battery pack, 4-24 parts of a fourth battery pack, 5-1 parts of a rotor mandrel, 5-11 parts of a positioning gear, 5-2 parts of a rotor punching sheet, 5-3 parts of a rotor spacer bush, 5-4 parts of a fan blade, 5-5 parts of magnetic steel, 5-6 parts of a balance ring and 5-7 parts of a magnetic steel groove.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in fig. 1 and 2, the electric hammer comprises an electric tool body 3-1, a bracket 3-2, a swing rod bearing transmission structure, a brushless motor 1-7 and a battery assembly; the support is arranged in the electric tool body 3-1, and the brushless motor 1-7 and the battery pack are respectively arranged on two sides of the support; a through hole is formed in the middle of the bracket and is used for the gear of the brushless motor 1-7 to pass through, and a placing hole 3-22 is formed below the through hole and is used for the transmission structure of the swing rod bearing to pass through; the swing rod bearing transmission structure is meshed with the brushless motors 1-7.

The specific swing rod bearing transmission structure is shown in figures 3-9 and comprises a swing rod bearing, clutches 1-5 and intermediate shafts 1-6 and cylinders 1-8. One side of the swing rod bearing is connected with the clutch 1-5. The intermediate shaft 1-6 penetrates through the swing rod bearing, one end of the intermediate shaft 1-6 is connected with the brushless motor 1-7 through the primary driven wheel 1-9, and the other end of the intermediate shaft is connected with the clutch 1-5. The cylinders 1-8 are connected with a swing rod bearing. That is, the first-stage driven wheel 1-9 of the linkage mechanism drives the intermediate shaft 1-6 to rotate through the operation of the brushless motor 1-7, the intermediate shaft 1-6 drives the clutch 1-5, the clutch 1-5 drives the swing rod bearing, and the swing rod bearing is linked with the cylinder 1-8 to operate. The mutual linkage cooperation, in addition to the design of swing rod bearing, provide a structure that has great percussion power.

One end of a specific intermediate shaft 1-6 is connected with a first-stage driven wheel 1-9 through sleeve joint, a spline is arranged at the other end of the intermediate shaft 1-6 and is connected with a clutch 1-5, namely, a strip-shaped groove is arranged on the inner side of one end, far away from the swing rod bearing, of the clutch 1-5, and the strip-shaped groove is matched with the spline on the intermediate shaft 1-6, so that a good linkage effect is realized, and the separation condition is not easy to occur.

The air cylinder 1-8 comprises an air cylinder body, a piston 1-81 and a rubber ring 1-82, wherein an annular groove is formed in the piston 1-81 and used for placing the rubber ring 1-82, and the rubber ring 1-82 is in contact with the inner side of the air cylinder body, so that good sealing performance is achieved, the whole structure is simple, follow-up maintenance is facilitated, and the rubber ring 1-82 can be replaced when a problem exists in the common air cylinder 1-8. One end of the cylinder 1-8, which is far away from the piston 1-81, is provided with a connecting hole, and the connecting hole is connected with a swing rod bearing through a connecting rod.

One end of the clutch 1-5, which is contacted with the swing rod bearing, is provided with symmetrical clutch grooves 1-51, the clutch grooves 1-51 comprise an arc part and a parallel part, the parallel part comprises a left part and a right part, the arc part is arranged at two ends of the parallel part, and the parallel part and the arc part are in smooth transition. The driving keys 1-32 of the swing rod bearing are arranged at the inner sides of the clutch grooves 1-51, and the running space of the swing rod bearing is provided.

On the whole, through the tight fit of the intermediate shafts 1-6 and the first-stage driven wheels 1-9, the first-stage driven wheels 1-9 are in contact connection with the brushless motors 1-7 to perform linkage work. The first-stage driven wheel 1-9 is driven by the rotation of the brushless motor 1-7, the intermediate shaft 1-6 is driven by the first-stage driven wheel 1-9 to rotate, so as to drive the clutch 1-5, and the clutch 1-5 and the swing rod bearing are combined and separated by the matching of a driving key on the swing rod bearing and a clutch groove 1-51 on the clutch 1-5. When the driving key is combined with the clutch groove 1-51, the intermediate shaft 1-6 drives the swing rod bearing to work, the swing rod bearing drives the air cylinder 1-8 to operate, and the larger the included angle of the swing rod bearing is, the longer the operation stroke of the air cylinder 1-8 is, so that the larger the impact power of the whole electric hammer is.

The specific swing rod bearing comprises an outer ring 1-1, steel balls 1-4 and inner rings 1-3, wherein the steel balls 1-4 are arranged between the outer ring 1-1 and the inner rings 1-3, the steel balls 1-4 are in contact with the outer ring 1-1 and the inner rings 1-3, and an included angle between the outer ring 1-1 and the horizontal direction is larger than 16.5 degrees. The included angle alpha between the outer ring 1-1 and the horizontal direction is 18 degrees to 20 degrees, generally 19 degrees are selected, and the design of the swing rod bearing with the maximum angle larger than the traditional 16.5 degrees is adopted, so that the swing angle of the swing rod bearing is increased, the stroke of the piston 1-81 is lengthened, and the impact power is improved. The outer ring 1-1 is made of 20CrMnTi, the depth of a carburized layer is 0.4 +/-0.1 mm, and the hardness is more than 600 HV. The steel balls 1-4 and the inner ring 1-3 adopt GCr15, and the hardness is 58HRC to 62 HRC.

Grooves are arranged on one side of the outer ring 1-1 close to the inner ring 1-3 and one side of the inner ring 1-3 close to the outer ring 1-1, and the shape of each groove is matched with that of the steel ball 1-4. The outer ring 1-1 and the inner ring 1-3 are both contacted with the steel ball 1-4. Namely, the outer ring 1-1 is provided with a groove which is in shape fit with the steel ball 1-4 and is used as a sliding track of the steel ball 1-4, and the outer side of the inner ring 1-3 is provided with a corresponding groove which is in shape fit with the steel ball 1-4 and is used as a sliding track of the inner ring 1-3. The sliding tracks on the inner rings 1-3 are obliquely arranged and have the same included angle with the swing rod bearing. The outer ring 1-1 is moved in a certain range through the steel balls 1-4 as a whole.

The outer ring 1-1 comprises a swing rod 1-11 and an outer ring body 1-12, and the thickness of the outer ring 1-1 is larger as the outer ring is closer to the swing rod 1-11. The junction of the swing rod 1-11 and the outer ring body 1-12 is provided with a transition part, and the transition part adopts a circular arc shape and has a thickness larger than the thickness of the other parts of the outer ring 1-1. The strength of the swing rods 1-11 is improved through effective thickening, and fragmentation at the transition position is effectively prevented. The thickness of the transition part of the outer ring body 1-12 can reach more than twice of the thickness of the part of the outer ring 1-1 far away from the swing rod 1-11.

The inner ring 1-3 comprises an inner ring body 1-31, a driving key 1-32 and a joint part 1-33, wherein the driving key 1-32 and the joint part 1-33 are oppositely arranged at two sides of the inner ring body 1-31. The inner ring body 1-31 is spherical and is provided with a through hole which passes through the centers of the inner ring body 1-31, the drive key 1-32 and the joint part 1-33. The through hole is used for placing an intermediate shaft 1-6 of the light electric hammer, and the intermediate shaft 1-6 drives the swing rod bearing to work. The two ends of the through hole are provided with excessive expansion parts, the cross section of each excessive expansion part is in an isosceles trapezoid shape, and corresponding installation and component loss reduction are facilitated through the arrangement.

The driving keys 1-32 comprise annular disks and driving columns, and the driving columns comprise two driving columns which are oppositely arranged on the annular disks. The outer side and the inner side of the driving column are both arc-shaped, the center point of the circular radian is the same as that of the annular wafer, and the driving column is in contact with the clutch 1-5 to perform linkage work.

The engaging portions 1 to 33 are in the shape of circular columns. The first-stage driven wheel 1-9 is contacted, and the outer side of the first-stage driven wheel 1-9 is connected with a gear on the brushless motor 1-7 to perform linkage operation.

The swing rod bearing transmission structure further comprises a retainer 1-2, wherein the retainer 1-2 is in a circular ring sheet shape and is arranged below the steel balls 1-4. The retainer 1-2 is fixedly connected with the outer ring 1-1 so as to reduce the possible damage of the steel balls 1-4.

Overall, a shifting block passive reset structure is arranged at one end of the swing rod bearing transmission structure shown in fig. 10-14, which is far away from the brushless motor, and comprises a shifting block 2-1, a reset spring 2 and a fixing part 5; the return spring 2 is arranged between the shifting block 2-1 and the fixing part 5. The whole hammer drill keeps a certain distance between the shifting block 2-1 and the fixing piece 5 through the reset spring 2, so that the hammer drill on the other side of the shifting block 2-1 cannot be attached to the positioning piece through the shifting block 2-1, and the hammer drill only rotates and does not hammer.

The shifting block 2-1 is provided with a convex block 3 connected with and fixed with the reset spring 2, the fixing piece 5 is provided with a groove 4 for placing the reset spring 2, the arrangement provides a moving space for the reset spring 2, and when the shifting block 2-1 moves towards the fixing piece 5, the reset spring 2 restores the shifting block 2-1 to the original position. Generally, the convex block 3 of the reset spring 2 is cylindrical, the groove 4 of the reset spring 2 is also cylindrical, the cylindrical reset spring 2 is easy to fix and limit, and the reset spring 2 and the corresponding convex block 3 and the corresponding groove 4 are easy to realize matching.

A guide groove 6 and a guide column 7 are arranged between the shifting block 2-1 and the fixing piece 5, and a guide angle is arranged at one end, close to the guide groove 6, of the guide column 7. The shifting block 2-1 can be provided with a guide post 7, the fixing piece 5 can be provided with a guide groove 6, or the shifting block 2-1 can be provided with the guide groove 6, and the fixing piece 5 can be provided with the guide post 7. The design of the guide post 7 and the guide groove 6 plays a role in auxiliary limiting, so that the shifting block 2-1 and the fixing piece 5 cannot fall off or deviate.

The shapes of the guide groove 6 and the guide post 7 are matched, and if the guide post 7 is cylindrical as a whole, the guide groove 6 is also cylindrical. The length of the reset spring 2 which is restored to the original state is less than the sum of the depth of the guide groove 6 and the height of the guide column 7, so that the auxiliary limiting effect is achieved, and the shifting block 2-1 and the fixing piece 5 can not be dislocated or deviated in movement within a certain range.

The passive reset structure of the shifting block 2-1 also comprises a knob 8. The knob 8 limits the distance the dial 2-1 can move. Specifically, a control lug is arranged on the knob 8, and a protrusion 13 matched with the control lug is arranged on the shifting block 2-1. The control lug is cylindrical, the protrusions 13 are flaky, and the control lug abuts against the corresponding protrusions 13 so as to control the distance between the shifting block 2-1 and the positioning piece and limit the lower limit of movement of the shifting block 2-1. The knob 8 comprises a knob body 81, a connecting spring 82 and a clamping piece 83; a clamping piece 83 is arranged in the knob body 81, a connecting spring 82 is arranged on the clamping piece 83 and the knob body 81, the clamping piece 83 and the knob body 81 are fixed through the connecting spring 82, and the clamping piece 83 and the knob body 81 are fixed through corresponding clamping structures. The knob body 81 is provided with a control projection, and the control projection is loosened or fixed through the clamping piece 83, so that the knob 8 can be easily rotated to a corresponding position.

The shifting block passive resetting structure also comprises clutches 1-5, a swing rod bearing 10 and a rotating sleeve structure 11. The rotating sleeve structure 11 is connected with the shifting block 2-1, the shifting block 2-1 is arranged at one end of the rotating sleeve structure 11 close to the fixing piece 5, and the fixing piece 5 is also sleeved and fixed on the rotating sleeve structure 11. The lower part of the shifting block 2-1 is connected with a clutch 1-5, the clutch 1-5 is contacted with a swing rod bearing 10, and a swing rod on the swing rod bearing 10 is connected with a rotating sleeve structure 11. Wherein, the shifting block 2-1 is annular as a whole; the rotating sleeve structure 11 comprises a rotating sleeve gear 12, and the rotating sleeve gear 12 is meshed with the gears on the clutches 1-5.

As shown in fig. 1 and 2, the electric tool comprises an electric tool body 3-1 and a bracket 3-2, wherein the bracket 3-2 is arranged inside the electric tool body 3-1, and an air duct is arranged on the bracket 3-2. The whole electric tool body 3-1 is divided into two parts by the support 3-2, the front part of the electric tool body 3-1 integrally achieves a sealing effect, and the two parts of spaces divided by the electric tool body 3-1 are communicated only through the air duct, so that pressure relief is realized, the internal pressure generated by the movement of the air cylinder in the electric tool body 3-1 is reduced, the effect of reducing the internal and external pressure difference is achieved, and the lubricating oil is prevented from leaking outwards when the electric tool operates.

The specific air channel is arranged at the upper end of the support 3-2 and comprises a main air channel 3-3 and side vent holes 3-4, and the main air channel 3-3 is communicated with the side vent holes 3-4. The main air passage 3-3 includes a tip portion 3-31, a communicating portion 3-32, a joining portion 3-33, and a filter placement portion 3-34. The tip part 3-31 is in a cone shape integrally, the communicating part 3-32 and the filtering placing part 3-34 are in a cylinder shape, the diameter of the filtering placing part 3-34 is larger than that of the communicating part 3-32, and the communicating part 3-32 is connected with the filtering placing part 3-34 through a connecting part 3-33; wherein the diameter of the joining part 3-33 near the filter placing part 3-34 is the largest, and the diameter of the joining part 3-33 near the communicating part 3-32 is the smallest. Since the overall temperature will rise when the power tool is operated, the hot air is formed relatively more upward than downward, and thus the air duct is provided at the upper end of the holder 3-2. The special structure of the air passage forms a quick pressure relief passage, and the tip part 3-31 realizes an air guiding space, so that slow air circulation is avoided. The communication parts 3-32, the connecting parts 3-33 and the filtering placing parts 3-34 gradually enlarge the channel of the main ventilation channel 3-3, which is beneficial to the dissipation of hot air and avoids overlarge local heat. The side vent holes 3-4 are integrally in a circular truncated cone shape, and the side vent holes 3-4 are communicated with the communicating parts 3-32 of the main ventilating channels 3-3, so that hot air can be discharged as soon as possible.

The filtering device is arranged on the filtering placing part 3-34 of the air passage to prevent the gas from directly discharging. The filtering device adopts a filter screen which is integrally cylindrical and is matched with the size of the filtering placing part 3-34. The electric tool body corresponding to the filtering device is provided with a positioning baffle plate 3-6 to limit the position of the filter, and the positioning baffle plate 3-6 only needs to adopt a narrow and long baffle plate.

The support 3-2 is embedded in the electric tool body 3-1, and the extending edge of the support, which is in contact with the electric tool body 3-1, is provided with a sealing ring 3-5 with a matched shape, so that the sealing effect of two parts is achieved, and the stability is improved. The center of the bracket 3-2 is provided with a through hole 3-21 connected with a motor, and a placing hole 3-22 connected with a swing rod bearing is arranged below the through hole 3-21. The motor and the swing rod bearing are arranged on two sides of the bracket 3-2; the bracket 3-2 and the electric tool body 3-1 are fixed by bolts; the motor is meshed with the swing rod bearing, and one end of the swing rod bearing, which is far away from the motor, is meshed with the clutch.

The motor on one side of the bracket 3-2 drives the swing rod bearing and the clutch to operate the electric tool. When the electric tool is operated, the cylinder does reciprocating motion to generate internal pressure, and the matching part of the head shell and the bracket 3-2 is sealed at the front end of the rotating sleeve of the electric tool, so that the internal temperature of the electric tool is increased and lubricating oil becomes thin when the electric tool continuously works, and the lubricating oil leaks from the part with weaker sealing performance under the action of the internal pressure. Through the setting with the air flue, keep inside and outside atmospheric pressure balanced, reduce the outside leakage of lubricating oil after the dilution, the setting of filter prevents that gas from directly discharging simultaneously, reaches the effect of avoiding the seepage.

The battery assembly shown in fig. 15-20 comprises a first battery assembly 4-1 and a second battery assembly 4-2, wherein the first battery assembly 4-1 is electrically connected with the second battery assembly 4-2, and is generally connected in parallel, that is, the batteries in the first battery assembly 4-1 and the second battery assembly 4-2 are connected with each other to form a loop, and the end of the second battery assembly 4-2 is inserted and fixedly installed in the first battery assembly 4-1, so that the overall strength of the battery assembly is improved, the vibration resistance is improved, and the higher use requirement of the tool is met.

The first battery pack 4-1 and the second battery pack 4-2 are connected in a mutually perpendicular mode, the first battery pack 4-1 is arranged in a row mode, the second battery pack 4-2 is arranged in a barrel mode, preferably, the first battery pack 4-1 and the second battery pack 4-2 are provided with four batteries, the first battery pack 4-1 is in a tiled mode, and the second battery pack 4-2 is in a two-row two-column overlapped rectangular mode, so that the second battery pack 4-2 can be conveniently inserted into and installed in a tool, and stability of the battery packs is improved.

The first battery pack 4-1 comprises a base cover 4-3, a base 4-4 and a lower battery pack 4-5, the lower battery pack 4-5 is fixedly installed in a battery installation frame 4-8, the base cover 4-3 is fixedly installed on the base 4-4, and the base 4-4 and the base cover 4-3 wrap the lower battery pack 4-5 comprehensively to improve the strength of the first battery pack 4-1.

The upper end face of the base cover 4-3 is provided with a battery mounting groove 4-6, the second battery component 4-2 is fixedly mounted in the battery mounting groove 4-6, the second battery component 4-2 is connected with the lower battery pack 4-5, and the battery mounting frame 4-8 is used for fixing a battery, so that the integrity of the battery component is improved, and the strength of the battery is improved.

The lower battery pack 4-5 includes a battery 4-7 and a first electric conduction sheet 4-9, the battery mounting bracket 4-8 is fixedly installed in the base 4-4, the battery 4-7 is fixedly installed in the battery mounting bracket 4-8, the first electric conduction sheet 4-9 is fixedly installed at both sides of the battery mounting bracket 4-8, and the first electric conduction sheet 4-9 is connected with the battery 4-7, the battery 4-7 is connected with each other through the first electric conduction sheet 4-9, the battery mounting bracket 4-8 is used for installing the battery and is used for connecting the second battery pack 4-2 with the base cover, thereby improving the integrity and strength of the lower battery pack 4-5.

The clamping grooves 4-10 are formed in the upper end face of the battery mounting frame 4-8, and the second battery component 4-2 is fixedly mounted in the clamping grooves 4-10, so that the second battery component 4-2 is conveniently connected with the battery mounting frame 4-8, and the mounting efficiency is improved.

The second battery pack 4-2 comprises a battery sleeve 4-11, a battery lower end plate 4-12, a battery upper end plate 4-13 and a battery 4-7, the battery lower end plate 4-12 and the battery upper end plate 4-13 are fixedly mounted at two ends of the battery 4-7 to form an upper battery pack, the upper battery pack is fixedly connected with the first battery pack 4-1, namely the upper battery pack is fixedly connected with a battery mounting frame 4-8, the battery sleeve 4-11 is sleeved on the outer side of the upper battery pack, and the upper battery pack is wrapped by the battery sleeve 4-11, so that the overall strength of the upper battery pack is improved.

A second electric conducting strip 4-14 is fixedly mounted on the lower end plate 4-12 of the battery, and the second electric conducting strip 4-14 is connected with the lower battery pack 4-5, thereby connecting the batteries of the first battery pack 4-1 and the second battery pack 4-2, and circulating the stroke.

The upper end plate 4-13 of the battery comprises a battery frame 4-15, an electric conduction plate 4-16 is arranged on the upper end plate of the battery, the battery frame 4-15 is fixedly connected with the battery 4-7, a third electric conduction sheet 4-17 is arranged in the battery frame 4-15, the third electric conduction sheet 4-17 is fixedly connected with the electric conduction plate 4-16, the third electric conduction sheet 4-17 is connected with the upper battery pack, and the electric conduction plate 4-16 is also connected with the first battery pack 4-1, namely the electric conduction plate 4-16 is connected with the first electric conduction sheet 4-9, so that the batteries 4-7 are mutually connected.

The upper end face of the electric conduction plate 4-16 is provided with a reed 4-18, the upper end face of the battery sleeve 4-11 is fixedly provided with a connecting terminal 4-19, the connecting terminal 4-19 is internally provided with an inserting piece 4-20, the inserting piece 4-20 is detachably connected with the reed 4-18, and the battery pack can be conveniently connected into a working circuit through the connecting terminal 4-19.

The brushless motor shown in fig. 21-23 comprises a rotor mandrel 5-1, rotor punching sheets 5-2, rotor spacer bushes 5-3, fan blades 5-4, magnetic steel 5-5 and balance rings 5-6. The rotor punching 5-2 is fixedly connected with the rotor mandrel 5-1, the fan blade 5-4 is connected with one end, close to the output shaft, of the rotor punching 5-2, and the size and the positioning of the fan blade 5-4 and the rotor punching 5-2 are matched with the positioning gear 5-11 on the rotor mandrel 5-1. The magnetic steel 5-5 is arranged in the magnetic steel groove 5-7 of the rotor punching sheet 5-2 according to the polarity sequence, and the shape of the magnetic steel 5-5 is matched with the shape of the magnetic steel groove 5-7 of the rotor punching sheet 5-2; the size of the magnetic steel 5-5 is generally slightly larger than that of the rotor punching sheet 5-2. The part of the magnetic steel 5-5, which exceeds the height of the rotor punching sheet 5-2, is provided with a rotor spacer 5-3. The rotor spacer 5-3 and the rotor punching sheet 5-2 completely cover the magnetic steel 5-5, so that a series of problems caused by inconsistent stacking height of the rotor punching sheet 5-2 are solved through the rotor spacer 5-3. The balance ring 5-6 is arranged at one end of the open ring of the rotor punching sheet 5-2, only one balance ring 5-6 is adopted, the whole balance ring is a step-shaped circular ring column, a cylindrical through hole is arranged in the middle, the size of the through hole is matched with that of the rotor mandrel 5-1, and the effect of sealing and fastening one end of the open ring of the rotor punching sheet 5-2 is achieved. The specific arrangement position of one fan blade 5-4 replaces the traditional fan blade 5-4 and the balance ring 5-6, so that the fan blade 5-4 not only plays a role in cooling and heat dissipation, but also plays a role in punching press mounting size positioning and the balance ring 5-6, and the overall manufacturing cost is greatly reduced.

The punching piece gear position of the rotor mandrel 5-1 adopts a grinding process of knurling firstly and then finish machining, and the requirements of push-out force and torsion between relevant parts of the rotor mandrel 5-1 and the rotor punching piece 5-2 are greatly guaranteed.

The design of the magnetic steel 5-5 adopts the combination of an embedded type and a surface-mounted type. Specifically, the N pole of the magnetic steel slot 5-7 of the rotor punching sheet 5-2 adopts a regular structure, and the S pole of the magnetic steel slot 5-7 of the rotor punching sheet 5-2 adopts an irregular structure; or on the contrary, the S pole of the magnetic steel slot 5-7 of the rotor punching sheet 5-2 adopts a regular structure, and the N pole of the magnetic steel slot 5-7 of the rotor punching sheet 5-2 adopts an irregular structure. In the production and manufacturing process, the mounting positions of the N pole and the S pole are unique, so that the fool-proof operation effect is achieved. The shape of the magnetic steel 5-5 is matched with the shape of a magnetic steel groove 5-7 of the rotor punching sheet 5-2; the regular structure adopts an arc shape, the irregular structure adopts two straight edges, and the included angle of the two straight edges is 135-160 degrees. The design of the N-pole magnetic steel and the S-pole magnetic steel enables the N-pole magnetic steel and the S-pole magnetic steel to be extremely close to the outer diameter surface of the rotor punching sheet 5-2, so that the utilization rate of the performance of the magnetic steel 5-5 is improved, and the performance of the motor is improved.

In summary, when the knob 8 is rotated to the corresponding function position, the moving distance of the dial 2-1 is limited by the control projection and the corresponding protrusion 13. Specifically, taking the electric hammer device as an example, when the knob 8 is at the hammer drill stop and the electric hammer is started to perform standby operation, the shifting block 2-1 is pushed open by the return spring 2, the shifting block 2-1 drives the rotating sleeve structure 11 and the clutch 1-5 to move outwards, at this time, the clutch 1-5 and the swing rod bearing 10 are in a disengaged state, and the swing rod bearing 10 does not work. Namely, the rotating sleeve gear 12 on the rotating sleeve structure 11 is meshed with the gear on the clutch 1-5, when the rotating sleeve gear 12 rotates, the whole device only rotates without hammering, and the whole device does not generate idle hammer noise. When the electric hammer starts to operate the hammer drill, the electric hammer presses the rotating sleeve structure 11 to move backwards; the shifting block 2-1 compresses the return spring 2, at the moment, the shifting block 2-1 also drives the clutch 1-5 to move backwards, the clutch 1-5 is connected with the swing rod bearing 10, the swing rod bearing 10 starts to work, and the rotating sleeve component is hammered. Therefore, the electric hammer can realize the functions of hammering and drilling at the same time, and the whole machine can carry out hammer drill operation.

In the scheme, the motor on one side of the support 3-2 drives the swing rod bearing 10 and the clutch 1-5 to operate the electric tool. When the electric tool is operated, the cylinder does reciprocating motion to generate internal pressure, and the matching part of the head shell and the bracket 3-2 is sealed at the front end of the rotating sleeve of the electric tool, so that the internal temperature of the electric tool is increased and lubricating oil becomes thin when the electric tool continuously works, and the lubricating oil leaks from the part with weaker sealing performance under the action of the internal pressure. Through the setting with the air flue, keep inside and outside atmospheric pressure balanced, reduce the outside leakage of lubricating oil after the dilution, the setting of filter prevents that gas from directly discharging simultaneously, reaches the effect of avoiding the seepage.

According to the scheme, the fan blades 5-4, the rotor core shaft 5-1 and the rotor punching sheets 5-2 are integrally pressed and positioned only through the tool clamp which is reasonable in design, so that the production efficiency can be greatly improved, errors of stacking tolerance caused by repeated positioning are reduced, meanwhile, the fan blades 5-4 replace the traditional fan blades 5-4 and the balance rings 5-6, the cost is greatly reduced, and the rotor spacer sleeves 5-3 are added, so that a series of problems caused by inconsistent stacking height of the rotor punching sheets 5-2 are eliminated. The specially-made rotor punching sheet 5-2 is designed to improve the convenience and the working efficiency in the working process, give full play to the performance of the magnetic steel 5-5 and play a foolproof role in the production and manufacturing process.

And this scheme battery package design is simple reasonable, duration is stronger, can satisfy heavy current operation.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the spirit of the present invention, and these modifications and decorations should also be regarded as being within the scope of the present invention.

Claims

1. An electric hammer is characterized by comprising an electric tool body, a bracket, a swing rod bearing transmission structure, a brushless motor and a battery pack; the bracket is arranged in the electric tool body, and the brushless motor and the battery pack are respectively arranged on two sides of the bracket; a through hole is formed in the middle of the bracket and is used for a gear of the brushless motor to pass through, and a placing hole is formed below the through hole and used for a swing rod bearing transmission structure to pass through; the swing rod bearing transmission structure is meshed with the brushless motor;

the swing rod bearing transmission structure comprises a swing rod bearing, a clutch, an intermediate shaft and a cylinder; one side of the swing rod bearing is connected with the clutch; the middle shaft penetrates through the swing rod bearing, one end of the middle shaft is connected with the brushless motor through the first-stage driven wheel, and the other end of the middle shaft is connected with the clutch; the cylinder is connected with the swing rod bearing;

one end of the swing rod bearing transmission structure, which is far away from the brushless motor, is provided with a shifting block passive reset structure, which comprises a shifting block, a reset spring and a fixing piece; the reset spring is arranged between the shifting block and the fixing piece; the shifting block is provided with a convex block for connecting and fixing the return spring, and the fixing piece is provided with a groove for placing the return spring; a guide groove and a guide column are arranged between the shifting block and the fixing piece, and a guide angle is arranged at one end of the guide column close to the guide groove;

the air duct is arranged on the bracket and is arranged at the upper end of the bracket; the air passage comprises a main air passage and a side vent hole, and the main air passage is communicated with the side vent hole; the main ventilation channel comprises a tip part, a communication part, a connecting part and a filtering placing part; the tip part is integrally conical, the communicating part and the filtering placing part are cylindrical, the diameter of the filtering placing part is larger than that of the communicating part, and the communicating part is connected with the filtering placing part through a connecting part; wherein, the diameter of the linking part close to the filtering placing part is the largest, and the diameter of the linking part close to the communication part is the smallest;

the battery assembly comprises a first battery assembly and a second battery assembly, the first battery assembly is electrically connected with the second battery assembly, and the end part of the second battery assembly is inserted and fixedly arranged in the first battery assembly;

the first battery component and the second battery component are mutually and vertically connected, the first battery component is arranged in a row shape, and the second battery component is arranged in a barrel shape;

the brushless motor comprises a rotor mandrel, a rotor punching sheet, a rotor spacer bush, fan blades, magnetic steel and a balance ring; the rotor punching sheet is fixedly connected with the rotor mandrel, the fan blades are connected with one end, far away from the balance ring, of the rotor punching sheet, the magnetic steels are placed in magnetic steel grooves of the rotor punching sheet according to the polarity sequence, the part, exceeding the height of the rotor punching sheet, of the magnetic steels is provided with a rotor spacer bush, and the balance ring is arranged at one end of an open loop of the rotor punching sheet; the sizes of the fan blades and the rotor punching sheet are matched with a positioning gear positioned on the rotor mandrel.

2. An electric hammer as set forth in claim 1, wherein: the swing rod bearing comprises an outer ring, a steel ball and an inner ring, wherein the steel ball is arranged between the outer ring and the inner ring and is in contact with the outer ring and the inner ring; grooves are arranged on one side of the outer ring close to the inner ring and one side of the inner ring close to the outer ring, and the shapes of the grooves are adapted to the steel balls; the outer ring forms an angle of 18-20 degrees with the horizontal direction.

3. An electric hammer as set forth in claim 2, wherein: the outer ring comprises a swing rod and an outer ring body, and the thickness of the outer ring body is larger as the outer ring body is closer to the swing rod; a transition part is arranged at the joint of the oscillating bar and the outer ring body, and the transition part adopts a circular arc shape and has a thickness larger than the thickness of other parts of the outer ring body;

4. An electric hammer as set forth in claim 1, wherein: the knob is used for controlling the shifting block; a control lug is arranged on the knob, and a protrusion which is matched with the control lug is arranged on the shifting block; the knob comprises a knob body, a connecting spring and a clamping piece; a clamping piece is arranged in the knob body, and the clamping piece and the knob body piece are provided with a connecting spring; the control lug is cylindrical, and the protrusion is flaky.

5. An electric hammer as set forth in claim 1, wherein: the air passage is provided with a filtering device; the filtering device adopts a filter screen which is cylindrical as a whole; and a positioning baffle is arranged on the electric tool body corresponding to the filtering device.

6. An electric hammer as set forth in claim 1, wherein: the first battery component comprises a base, a base cover and a lower battery pack, the lower battery pack is fixedly arranged in the base, and the base cover is fixedly arranged on the base; be equipped with the battery mounting groove on the up end of base lid, second battery pack fixed mounting is in the battery mounting groove, and second battery pack is connected with lower floor's group battery.

7. An electric hammer as set forth in claim 1, wherein: the second battery component comprises a battery sleeve, a battery upper end plate, an electric guide plate, a battery lower end plate and a battery, the electric guide plate is arranged on the battery upper end plate, the battery upper end plate and the battery lower end plate are fixedly arranged at two ends of the battery to form an upper battery pack, the upper battery pack is fixedly connected with the first battery component, and the battery sleeve is sleeved on the outer side of the upper battery pack; a second electric conducting sheet is fixedly arranged on the lower end plate of the battery, and the second electric conducting sheet is connected with the first battery component; the battery upper end plate comprises a battery frame, the battery frame is fixedly connected with the battery, a third electric conduction piece is arranged in the battery frame and fixedly connected with the electric conduction plate, and the third electric conduction piece is connected with the upper battery pack.

8. An electric hammer as set forth in claim 1, wherein: the N pole of the magnetic steel groove of the rotor punching sheet adopts a regular structure, and the S pole of the magnetic steel groove of the rotor punching sheet adopts an irregular structure; or on the contrary, the S pole of the magnetic steel groove of the rotor punching sheet adopts a regular structure, and the N pole of the magnetic steel groove of the rotor punching sheet adopts an irregular structure; the shape of the magnetic steel is matched with that of a magnetic steel groove of the rotor punching sheet; the size of the magnetic steel is larger than that of the rotor punching sheet; the regular structure is arc-shaped, the irregular structure is two straight edges, and the included angle of the two straight edges is 135-160 degrees.