WO2021036095A1

WO2021036095A1 - Novel electric hammer

Info

Publication number: WO2021036095A1
Application number: PCT/CN2019/124760
Authority: WO
Inventors: 李坚忠
Original assignee: 浙江信源电器制造有限公司
Priority date: 2019-08-28
Filing date: 2019-12-12
Publication date: 2021-03-04
Also published as: CN110561350B; CN110561350A

Abstract

A novel electric hammer, comprising an electric tool body (3-1), a support (3-2), an oscillating rod bearing transmission structure, a brushless motor (1-7), and a battery assembly. The support is provided inside the electric tool body. The brushless motor and the battery assembly are provided on both sides of the support, respectively. a through hole is formed in the middle of the support for a gear of the brushless motor to pass through. An insertion hole (3-22) is formed below the through hole for the oscillating rod bearing transmission structure to pass through. The oscillating rod bearing transmission structure is meshed with the motor. The electric hammer is simple in structure and can improve the product positioning accuracy and save cost in operation.

Description

A new type of electric hammer

Technical field

The utility model relates to the field of electric tools, more specifically, it relates to a new type of electric hammer.

Background technique

The existing rechargeable electric hammer is basically 12V and has a Harvard structure. The motor is basically a brushed motor, the pendulum bearing is 16.5 degrees, the cylinder diameter is basically 17 mm, and the battery pack is basically 3 series single parallel. Although the fuselage is lighter and lighter, the drilling rate is lower and the battery life is also lower. It is only suitable for household users. At the same time, the existing rechargeable electric hammer is noisy and the case is prone to occur when there is an empty hammer. Defects such as oil leakage affect the actual experience of the product.

Summary of the invention

The utility model overcomes the shortcomings of the prior art, provides a new type of electric hammer which has a simple and reasonable structure, significantly increases the endurance, and improves the hammering effect of the whole machine.

The technical scheme of the utility model is as follows:

A new type of electric hammer, including a power tool body, a bracket, a pendulum rod bearing transmission structure, a brushless motor and a battery assembly; the bracket is arranged inside the power tool body, the brushless motor and the battery assembly are respectively arranged on both sides of the bracket; the middle of the bracket A through hole is provided for the gears of the brushless motor to pass through, and a placement hole is provided under the through hole for the pendulum rod bearing transmission structure to pass through; the pendulum rod bearing transmission structure meshes with the motor.

Further, the pendulum bearing transmission structure includes a pendulum bearing, a clutch, an intermediate shaft and a cylinder; one side of the pendulum bearing is connected with the clutch; the intermediate shaft penetrates the pendulum bearing, and one end of the intermediate shaft is connected to the brushless motor through a primary driven wheel, The other end is connected with the clutch; the cylinder is connected with the swing rod bearing.

Further, the pendulum bearing includes an outer ring, a steel ball and an inner ring, the steel ball is arranged between the outer ring and the inner ring, and the steel ball is in contact with the outer ring and the inner ring, and the angle between the outer ring and the horizontal direction is greater than 16.5°; The side of the ring close to the inner ring and the side of the inner ring close to the outer ring are provided with grooves, and the shape of the groove is adapted to the steel ball; the angle between the outer ring and the horizontal direction is 18° to 20°.

Further, the outer ring includes a pendulum rod and an outer ring body. The closer the outer ring body is to the pendulum rod, the greater its thickness; the junction between the pendulum rod and the outer ring body is provided with a transition point, which is arc-shaped and thicker than the outer ring body Thickness elsewhere;

The inner ring includes an inner ring body, a driving key and a connecting part. The driving key and the connecting part are arranged oppositely on both sides of the inner ring body; the inner ring body is spherical and has a through hole, which passes through the inner ring body, the driving key and the connecting part. The center of the part; the driving key includes a ring disc and a driving column, the driving column includes two and is arranged oppositely on the ring disc; the connecting part adopts a ring column shape; the connecting part contacts the clutch groove, the shape of the clutch groove and the connecting part The shape matches.

Further, the end of the pendulum bearing transmission structure away from the brushless motor is provided with a passive reset structure for the shift block, which includes a shift block, a return spring, and a fixing piece; the return spring is arranged between the shift block and the fixing piece; a connection and fixing is provided on the shift block The convex block of the return spring, the fixed part is provided with a groove for placing the return spring; a guide groove and a guide post are arranged between the shift block and the fixed part, and the guide post is provided with a lead angle at one end close to the guide groove.

Further, it also includes a knob, a knob control dial block; a control protrusion is provided on the knob, and a protrusion corresponding to the control protrusion is provided on the dial; the knob includes a knob body, a connecting spring, and a clamp; the knob body is provided with a clamp , The clamping piece and the knob body piece are provided with a connecting spring; the control protrusion adopts a cylindrical shape, and the protrusion adopts a sheet shape.

Further, a ventilation channel is provided on the stent, and the ventilation channel is arranged at the upper end of the stent; the ventilation channel includes a main ventilation channel and a side ventilation hole, the main ventilation channel and the side ventilation holes are connected; the main ventilation channel includes a tip, a connecting part, and a connecting part And the filter placement part; the tip part is cone-shaped as a whole, the communicating part and the filtering placement part are cylindrical, the diameter of the filtering placement part is larger than the diameter of the communicating part, and the communicating part and the filtering placement part are connected by the joint part; where, the joint The diameter of the part close to the filter placement part is the largest, and the diameter of the connecting part close to the communicating part is the smallest.

Further, a filter device is provided on the air passage; the filter device adopts a filter net, which is cylindrical in its entirety; and a positioning baffle is provided on the main body of the electric tool corresponding to the filter device.

Further, the battery assembly includes a first battery assembly and a second battery assembly, the first battery assembly is electrically connected to the second battery assembly, and the end of the second battery assembly is inserted and fixedly installed in the first battery assembly;

Further, the first battery assembly is electrically connected to the second battery assembly, the end of the second battery assembly is inserted and fixedly installed in the first battery assembly, the first battery assembly and the second battery assembly are connected perpendicularly to each other, and the first battery assembly is Arranged in rows, and the second battery assembly is arranged in a barrel shape;

Further, the first battery assembly includes a base, a base cover, and an upper battery pack, the upper battery pack is fixedly installed in the base, and the base cover is fixedly installed on the base; the upper end surface of the base cover is provided with a battery The installation slot, the second battery assembly is fixedly installed in the battery installation slot, and the second battery assembly is connected to the lower battery pack;

Further, the second battery assembly includes a battery sleeve, a battery upper end plate, a conductive plate, a battery lower end plate, and a battery. The conductive plate is installed on the battery upper end plate, and both the battery upper end plate and the battery lower end plate are fixedly installed on both ends of the battery to form an upper battery. The upper battery pack is fixedly connected with the first battery assembly, and a battery cover is sleeved on the outer side of the upper battery pack; a second conductive sheet is fixedly installed on the lower end plate of the battery, and the second conductive sheet is connected with the first battery assembly; the battery The upper end plate includes a battery frame, the battery frame is fixedly connected with the battery, a third conductive sheet is arranged in the battery frame, the third conductive sheet is fixedly connected with the conductive plate, and the third conductive sheet is connected with the upper battery pack.

Further, the brushless motor includes a rotor core shaft, a rotor punching piece, a rotor spacer, a fan blade, a magnet and a balance ring; the rotor punching blade is tightly connected with the rotor core shaft, and the fan blade and the rotor punching blade are close to the output shaft The magnetic steel is placed in the magnetic steel groove of the rotor punching piece in order of polarity. The part where the magnetic steel exceeds the height of the rotor punching piece is provided with a rotor spacer, and the balance ring is set at the open end of the rotor punching piece; The size and positioning of the rotor blades are compatible with the positioning gear on the rotor core shaft;

The N pole of the magnetic steel groove of the rotor punching piece adopts a regular structure, and the S pole of the magnetic steel groove of the rotor punching piece adopts an irregular structure; or vice versa; the shape of the magnet matches the shape of the magnetic steel groove of the rotor punching piece ; The size of the magnet is greater than the size of the rotor punching sheet; among them, the regular structure adopts an arc shape, and the irregular structure adopts two straight sides, and the angle between the two straight sides is between 135° and 160°.

Compared with the prior art, the utility model has the following advantages:

The dial block and the fixed part are kept at a certain distance by the return spring, so that the hammer drill on the other side of the dial block will not fit the positioning part by the dial block, and the hammer drill only rotates without hammering. The design of the shifting block and the fixed part play an auxiliary limiting function, so that the shifting block and the fixed part will not fall off or shift. The control protrusion is arranged on the knob body, and the control protrusion is loosened or fixed by the clamping member, so as to easily turn the knob to the corresponding position. The rotating sleeve structure is connected with the shifting block, and the shifting block is arranged at one end of the rotating sleeve structure close to the fixed part, and the fixed part is also sleeved and fixed on the rotating sleeve structure. A clutch is connected under the shift block, the clutch is in contact with the swing rod bearing, and the swing rod on the swing rod bearing is connected with the rotating sleeve structure. When starting the electric hammer standby operation, the return spring pushes the shifting block open, and the shifting block drives the rotating sleeve structure and the clutch to move outwards. At this time, the clutch drive groove and the swing lever bearing drive key are in a disengaged state, and the swing lever bearing does not work; the rotating sleeve structure Only rotating, no hammering occurs, and the whole machine has no empty hammer noise.

The rotor punching piece structure of this scheme is compatible with the advantages of the embedded and surface-mounted structures on the market, so that the manufacturing process is simple, the magnetic steel performance utilization rate is high, and the overall performance of the motor is improved. This rotor punching design can not only improve its convenience and work efficiency in work, give full play to the performance of magnetic steel, but also play a role in preventing fools in the production process.

The rotor spacer is used to compensate a series of problems caused by the inconsistent stack height of the rotor blades. The balance ring is set at the open end of the rotor punching sheet. Only one balance ring is used. The whole is a stepped circular column with a cylindrical through hole in the middle. The size of the through hole is adapted to the rotor core shaft, which will seal and tighten. The role of the open end of the solid rotor punching sheet. The specific setting position of a fan blade replaces the traditional fan blade and the balance ring, so that the fan blade not only plays a role of cooling and heat dissipation, but also functions as a punching piece press-fit size positioning and a balance ring, which greatly reduces the overall manufacturing cost.

In this solution, the power tool body is divided into two parts through the bracket as a whole, and the front part of the power tool body achieves a sealing effect as a whole, and the two parts of the space divided by the power tool body are communicated only through the air duct, so as to achieve pressure relief and reduce the pressure caused by the power tool body. The internal pressure generated by the movement of the cylinder can reduce the pressure difference between the inside and the outside and avoid the leakage of lubricating oil when the power tool is in operation. The special structure of the air duct forms a rapid pressure relief channel, and the tip part realizes an air-conducting space to avoid slow air circulation. The communication part, the connection part and the filter placement part gradually expand the passage of the main ventilation channel, which is conducive to the dissipation of hot air and avoids excessive local heat. The side vent hole is in the shape of a truncated cone as a whole, and the side vent hole is connected with the communication part of the main ventilation channel, so that the hot air can be discharged as soon as possible.

The battery assembly of this scheme consists of two layers of cells, the upper layer is vertically arranged, and the lower layer is horizontally arranged. The four strings and two parallel connections are realized by connecting nickel sheets. The battery pack capacity is at least doubled compared with the conventional three strings and one parallel and four strings and one parallel. Above, the endurance has increased significantly. By inserting and installing the end of the upper battery assembly into the lower battery assembly, the overall strength of the battery pack is improved and the higher use requirements of tools are met.

Description of the drawings

Figure 1 is a structural diagram of the rotor core shaft of the utility model;

Figure 2 is a cross-sectional view of the rotor core shaft of the utility model;

Figure 3 is a cross-sectional view of the rotor punch of the utility model;

Figure 4 is a cross-sectional view of a traditional rotor punch;

Figure 5 is a structural diagram of the clutch of the utility model;

Figure 6 is a schematic diagram of the swing rod bearing of the utility model;

Figure 7 is a structural diagram of the swing rod bearing transmission of the utility model;

Figure 8 is a sectional view of the inner ring of the utility model;

Figure 9 is a sectional view of the pendulum rod bearing of the utility model;

Figure 10 is the overall structure diagram of the utility model when the clutch is separated from the swing rod bearing;

Figure 11 is the overall structure diagram of the utility model when the clutch is combined with the swing rod bearing;

Figure 12 is a schematic diagram of the fixture of the utility model;

Figure 13 is a schematic diagram of the dial block of the utility model;

Figure 14 is a structural diagram of the knob of the utility model;

Figure 15 is a schematic diagram of the structure of the battery assembly of the present invention.

Fig. 16 is a schematic diagram of the structure of Fig. 15 after being rotated at a certain angle;

Figure 17 is a schematic structural view of Figure 16 with the base cover concealed;

Figure 18 is a schematic diagram of the structure of the lower battery pack of the utility model;

Figure 19 is a schematic diagram of the structure of Figure 16 with the battery cover concealed;

FIG. 20 is a schematic structural diagram of the second battery assembly of the present invention with the battery cover hidden;

Figure 21 is a structural diagram of the rotor core shaft of the utility model;

Figure 22 is a cross-sectional view of the rotor core shaft of the utility model;

Figure 23 is a sectional view of the rotor punching piece of the rotor core shaft of the utility model;

Indicated in the figure: outer ring 1-1, swing rod 1-11, outer ring body 1-12, cage 1-2, inner ring 1-3, inner ring body 1-31, drive key 1-32, connection part 1-33, steel ball 1-4, clutch 1-5, clutch groove 1-51, intermediate shaft 1-6, brushless motor 1-7, cylinder 1-8, piston 1-81, rubber ring 1-82, Primary driven wheel 1-9, shift block 2-1, return spring 2, projection 3, groove 4, fixing member 5, guide groove 6, guide post 7, knob 8, knob body 81, connecting spring 82 , Clamp 83, Clutch 9, Swing Rod Bearing 10, Sleeve Structure 11, Sleeve Gear 12, Protrusion 13, Power Tool Body 3-1, Bracket 3-2, Through Hole 3-21, Placement Hole 3-22 , Ventilation main channel 3-3, tip 3-31, communicating part 3-32, connecting part 3-33, filter placement part 3-34, side ventilation hole 3-4, sealing ring 3-5, positioning baffle 3 -6, first battery assembly 4-1, second battery assembly 4-2, base cover 4-3, base 4-4, lower battery pack 4-5, battery installation slot 4-6, battery 4-7 , Battery mounting frame 4-8, first conductive sheet 4-9, clamping slot 4-10, battery sleeve 11, battery lower end plate 4-12, battery upper end plate 4-13, second conductive sheet 4-14, battery Frame 4-15, conduction plate 4-16, third conduction plate 4-17, reed 4-18, connecting terminal 4-19, insert 4-20, first battery pack 4-21, second battery pack 4 -22. The third battery pack 4-23, the fourth battery pack 4-24, the rotor core shaft 5-1, the positioning gear 5-11, the rotor punching piece 5-2, the rotor spacer 5-3, the fan blade 5 4. Magnetic steel 5-5, balance ring 5-6, magnetic steel groove 5-7.

detailed description

The present utility model will be further described below in conjunction with the drawings and specific implementations.

As shown in Figure 1 and Figure 2, a new type of electric hammer includes a power tool body 3-1, a bracket 3-2, a pendulum rod bearing transmission structure, a brushless motor 1-7 and a battery assembly; the bracket is arranged on the power tool body Inside 3-1, the brushless motor 1-7 and the battery assembly are respectively arranged on both sides of the bracket; a through hole is provided in the middle of the bracket for the gears of the brushless motor 1-7 to pass through, and a placement hole 3-22 is provided under the through hole. For the pendulum rod bearing transmission structure to pass; the pendulum rod bearing transmission structure meshes with the brushless motors 1-7.

The specific pendulum bearing transmission structure, as shown in Figure 3-9, includes the pendulum bearing, clutch 1-5, intermediate shaft 1-6, cylinder 1-8. One side of the pendulum rod bearing is connected with clutch 1-5. The intermediate shaft 1-6 runs through the pendulum rod bearing. One end of the intermediate shaft 1-6 is connected to the brushless motor 1-7 through the primary driven wheel 1-9, and the other end is connected to the clutch 1-5. The cylinders 1-8 are connected with the pendulum rod bearing. That is, as a whole, through the operation of the brushless motor 1-7, the primary driven wheel 1-9 of the linkage mechanism drives the intermediate shaft 1-6 to rotate, the intermediate shaft 1-6 drives the clutch 1-5, and the clutch 1-5 drives the swing lever bearing. The pendulum bearing links cylinders 1-8 to operate. The mutual linkage and the design of the pendulum rod bearing provide a structure with greater impact energy.

One end of the concrete intermediate shaft 1-6 is connected with the primary driven wheel 1-9 through a sleeve connection, and the other end of the intermediate shaft 1-6 is connected with the clutch 1-5 with a spline, that is, the end of the clutch 1-5 away from the pendulum bearing A strip groove is arranged on the inside, and the strip groove matches the spline on the intermediate shaft 1-6 to achieve a good linkage effect, and it is not easy to break away.

The cylinder 1-8 includes a cylinder body, a piston 1-81 and a rubber ring 1-82. The piston 1-81 is provided with an annular groove for placing the rubber ring 1-82. The rubber ring 1-82 is in contact with the inner side of the cylinder body to achieve a very It has good airtightness and simple overall structure, which is convenient for subsequent maintenance. Generally, the rubber ring 1-82 can be replaced when there is a problem with the cylinder 1-8. One end of the cylinder 1-8 away from the piston 1-81 is provided with a connecting hole, and a connecting rod is arranged on the connecting hole to connect the swing rod bearing.

The end of the clutch 1-5 in contact with the pendulum bearing is provided with a symmetrical clutch groove 1-51. The clutch groove 1-51 includes an arc part and a parallel part. The parallel part includes left and right parts, and the arc part is arranged at both ends of the parallel part. , The parallel part and the arc part are smoothly transitioned. The drive key 1-32 of the pendulum rod bearing is arranged inside the clutch groove 1-51 to provide an operating space for the pendulum rod bearing.

On the whole, through the tight fit between the intermediate shaft 1-6 and the first-stage driven wheel 1-9, the first-stage driven wheel 1-9 and the brushless motor 1-7 gears are connected in contact to perform linkage work. That is, through the rotation of the brushless motor 1-7, the primary driven wheel 1-9 is driven, and the primary driven wheel 1-9 drives the intermediate shaft 1-6 to rotate, thereby driving the clutch 1-5, clutch 1-5 and swing lever bearing The coupling and disengagement are carried out through the cooperation of the drive key on the pendulum bearing and the clutch groove 1-51 on the clutch 1-5. When the drive key is combined with the clutch groove 1-51, the intermediate shaft 1-6 drives the swing rod bearing to work, and the swing rod bearing drives the cylinder 1-8 to operate. The greater the angle between the swing rod bearing, the greater the operating stroke of the cylinder 1-8. Longer, the greater the impact energy of the whole electric hammer.

The specific pendulum bearing includes an outer ring 1-1, a steel ball 1-4 and an inner ring 1-3. The steel ball 1-4 is arranged between the outer ring 1-1 and the inner ring 1-3, and the steel ball 1-4 It is in contact with the outer ring 1-1 and the inner ring 1-3, and the angle between the outer ring 1-1 and the horizontal direction is greater than 16.5°. The angle α between the outer ring 1-1 and the horizontal direction is between 18° and 20°, and 19° is generally selected. The pendulum bearing is designed to be larger than the traditional maximum angle of 16.5° to increase the swing angle of the pendulum bearing. Lengthen the stroke of piston 1-81 to improve the impact energy. The outer ring 1-1 is made of 20CrMnTi, the depth of the carburized layer is 0.4±0.1mm, and the hardness is greater than 600HV. The steel balls 1-4 and inner ring 1-3 adopt GCr15, and the hardness is 58HRC to 62HRC.

The side of the outer ring 1-1 close to the inner ring 1-3 and the side of the inner ring 1-3 close to the outer ring 1-1 are provided with grooves, and the shape of the grooves is adapted to the steel ball 1-4. Both the outer ring 1-1 and the inner ring 1-3 are in contact with the steel ball 1-4. That is, the outer ring 1-1 is provided with a groove that fits the shape of the steel ball 1-4, 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 shape that fits the steel ball 1-4 The groove is used as the sliding track on the inner ring 1-3. The sliding track on the inner ring 1-3 is arranged obliquely, and the included angle is the same as that of the pendulum bearing. As a whole, the outer ring 1-1 is moved within a certain range through the steel ball 1-4.

The specific outer ring 1-1 includes a pendulum rod 1-11 and an outer ring body 1-12. The closer the outer ring 1-1 is to the pendulum rod 1-11, the greater its thickness. A transition point is provided at the junction of the pendulum rod 1-11 and the outer ring body 1-12, and the transition point adopts a circular arc shape and the thickness is greater than the thickness of other parts of the outer ring 1-1. Through the effective thickening, the strength of the pendulum rod 1-11 is improved, and the chipping at the transition is effectively prevented. The thickness of the transition part of the outer ring body 1-12 can be more than twice the thickness of the outer ring 1-1 away from the pendulum rod 1-11.

The inner ring 1-3 includes an inner ring body 1-31, a driving key 1-32, and a connecting portion 1-33. The driving key 1-32 and the connecting portion 1-33 are oppositely arranged on both sides of the inner ring body 1-31. The inner ring body 1-31 has a spherical shape and is provided with a through hole, which passes through the center of the inner ring body 1-31, the drive key 1-32, and the connecting portion 1-33. The through hole is used to place the intermediate shaft 1-6 of the light electric hammer, and the intermediate shaft 1-6 drives the pendulum rod bearing to work. Both ends of the through hole are provided with over-expanded parts, the cross-section of which is an isosceles trapezoid, which facilitates the corresponding installation and reduces the loss of components.

The driving key 1-32 includes a ring-shaped disc and a driving column. The driving column includes two and is arranged oppositely on the ring-shaped disk. The outer and inner sides of the drive column are arc-shaped, and the center point of the circular arc is the same as the annular disc, which will contact the clutch 1-5 for linkage work.

The connecting portion 1-33 adopts a circular columnar shape. It will contact the primary driven wheel 1-9, and the outer side of the primary driven wheel 1-9 will be connected with the gear on the brushless motor 1-7 for linkage operation.

The pendulum bearing transmission structure further includes a cage 1-2. The cage 1-2 is in the shape of a circular ring sheet and is arranged under the steel ball 1-4. The cage 1-2 is connected and fixed with the outer ring 1-1 to reduce the possible damage of the steel ball 1-4.

On the whole, the end of the pendulum bearing transmission structure shown in Figures 10-14 far away from the brushless motor is provided with a passive reset structure of the shift block, which includes the shift block 2-1, the return spring 2, the fixing member 5; the return spring 2 is arranged at Between the shift block 2-1 and the fixed part 5. As a whole, the dial block 2-1 and the fixed part 5 are kept at a certain distance through the return spring 2, so that the hammer drill on the other side of the dial block 2-1 will not fit the positioning part by the dial block 2-1, and the hammer drill only rotates No hammering occurs.

The shift block 2-1 is provided with a convex block 3 connected to fix the return spring 2, and the fixing member 5 is provided with a groove 4 for placing the return spring 2. This arrangement provides a moving space for the return spring 2 to realize the fixed position of the shift block 2-1. When the piece 5 moves, the return spring 2 will restore the dial block 2-1 to the original position. Generally, the projection 3 of the return spring 2 is cylindrical, and the groove 4 of the return spring 2 is also cylindrical. The cylindrical shape is easy to fix and limit the return spring 2, so that the return spring 2 and its corresponding projections 3 and grooves 4 Easier to achieve cooperation.

A guide groove 6 and a guide post 7 are arranged between the shift block 2-1 and the fixing member 5, and the guide post 7 is provided with a guide angle at one end close to the guide groove 6. It may be that a guide post 7 is provided on the shifting block 2-1 and a guide groove 6 is provided on the fixing member 5, or the guide groove 6 is provided on the shifting block 2-1 and a guide post 7 is provided on the fixing member 5 in reverse. The design of the guide post 7 and the guide groove 6 play an auxiliary limiting function, so that the shifting block 2-1 and the fixing member 5 will not fall off or deviate.

The shape of the guide groove 6 and the guide post 7 match, for example, the guide post 7 is cylindrical as a whole, and the guide groove 6 is also cylindrical. The length of the return spring 2 to its original shape is less than the sum of the depth of the guide groove 6 and the height of the guide post 7, which acts as an auxiliary limit, so that the shift block 2-1 and the fixed part 5 will not be misaligned within a certain range. And offset.

The passive reset structure of the dial block 2-1 also includes a knob 8. The knob 8 limits the distance that the dial 2-1 can move. Specifically, the knob 8 is provided with a control protrusion, and the dial 2-1 is provided with a protrusion 13 corresponding to the control protrusion. The control protrusion is cylindrical, and the protrusion 13 is in the shape of a sheet. The control protrusion resists the corresponding protrusion 13 to reach the distance between the control dial 2-1 and the positioning member, and limit the lower limit of the movement of the dial 2-1. The knob 8 includes a knob body 81, a connecting spring 82, and a clamping member 83; the knob body 81 is provided with a clamping member 83, and the clamping member 83 and the knob body 81 are provided with a connecting spring 82 to fix the clamping member 83 and the knob body by the connecting spring 82 81, and is fixed by the corresponding buckle structure on the clamping member 83 and the knob body 81. A control protrusion is provided on the knob body 81, and the control protrusion is loosened or fixed by the clamp 83, so that the knob 8 can be easily rotated to the corresponding position.

The passive reset structure of the shift block also includes a clutch 9, 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 member 5, and the fixing member 5 is also sleeved and fixed on the rotating sleeve structure 11. A clutch 9 is connected under the shift block 2-1, and the clutch 9 is in contact with the swing rod bearing 10, and the swing rod on the swing rod bearing 10 is connected with the rotating sleeve structure 11. Among them, the shift block 2-1 is in an annular shape as a whole; the sleeve structure 11 includes a sleeve gear 12, and the sleeve gear 12 meshes with a gear on the clutch 9.

As shown in Figures 1 and 2, the electric tool includes an electric tool body 3-1 and a bracket 3-2. The bracket 3-2 is arranged inside the electric tool body 3-1, and the air passage is arranged on the bracket 3-2. The power tool body 3-1 is divided into two parts through the bracket 3-2, and the front part of the power tool body 3-1 achieves a sealing effect as a whole, and the communication between the two parts of the power tool body 3-1 is only through the air passage , To achieve pressure relief, reduce the internal pressure generated by the movement of the cylinder in the power tool body 3-1, achieve the effect of reducing the internal and external pressure difference, and avoid the leakage of lubricating oil when the power tool is in operation.

The specific air vent is arranged at the upper end of the stent 3-2, the air vent includes the main air vent 3-3 and the side air vent 3-4, and the main air vent 3-3 and the side air vent 3-4 are connected. The main ventilation passage 3-3 includes a pointed portion 3-31, a communicating portion 3-32, a connecting portion 3-33, and a filter placement portion 3-34. The tip 3-31 is in the shape of a cone as a whole, the communicating portion 3-32 and the filter placement portion 3-34 are both cylindrical, the diameter of the filtering placement portion 3-34 is larger than the diameter of the communicating portion 3-32, and the communicating portion 3-32 is connected to the The filter placement portions 3-34 are connected by the connecting portion 3-33; wherein the connecting portion 3-33 has the largest diameter close to the filter placing portion 3-34, and the connecting portion 3-33 has the smallest diameter close to the communicating portion 3-32. Because the overall temperature will rise when the power tool is in operation, more hot air will be formed at the top than at the bottom, so the air duct is set at the upper end of the bracket 3-2. The special structure of the air duct forms a rapid pressure relief channel, and the tip 3-31 realizes an air-conducting space to avoid slow air circulation. The communication part 3-32, the connection part 3-33 and the filter placement part 3-34 gradually expand the passage of the main ventilation duct 3-3, which is conducive to the dissipation of hot air and avoids excessive local heat. The side vent hole 3-4 is in the shape of a truncated cone as a whole, and the side vent hole 3-4 is in communication with the communication part 3-32 of the main ventilation duct 3-3, so that the hot air can be discharged as soon as possible.

The filter placement part 3-34 of the air passage is provided with a filter device to prevent the gas from being directly discharged. The filter device adopts a filter screen, which is cylindrical as a whole, which is compatible with the size of the filter placement part 3-34. A positioning baffle 3-6 is provided on the main body of the electric tool corresponding to the filter device to limit the position of the filter. The positioning baffle 3-6 only needs to use a narrow and long baffle.

The bracket 3-2 is embedded in the power tool body 3-1, and a sealing ring 3-5 with a matching shape is arranged on the side of the contact with the power tool body 3-1 to achieve the sealing effect of dividing the two parts and improve the stability. Sex. The center of the bracket 3-2 is provided with a through hole 3-21 for connecting the motor, and a placement hole 3-22 for connecting the pendulum bearing is provided under the through hole 3-21. The motor and the pendulum bearing are arranged on both sides of the bracket 3-2; the bracket 3-2 and the power tool body 3-1 are fixed by bolts; the motor is engaged with the pendulum bearing, and the end of the pendulum bearing away from the motor is engaged with the clutch.

The swing rod bearing and clutch are driven by the motor on the side of the bracket 3-2 to perform the operation of the electric tool. During operation, the cylinder moves back and forth to generate internal pressure. Because the front end of the rotating sleeve of the power tool, the head shell and the bracket 3-2 have been sealed, which will cause the internal temperature of the power tool to rise and the lubricating oil to change during continuous operation. Lean, under the action of internal pressure, the lubricating oil will leak from the weaker sealing performance. Through the setting of the same air channel, the internal and external air pressure is balanced to reduce the leakage of lubricating oil after thinning. At the same time, the setting of the filter prevents the gas from being discharged directly and achieves the effect of avoiding leakage.

The battery assembly shown in Figures 15-20 includes a first battery assembly 4-1 and a second battery assembly 4-2. The first battery assembly 4-1 and the second battery assembly 4-2 are electrically connected and generally connected in parallel, namely The batteries in the first battery assembly 4-1 and the second battery assembly 4-2 are connected to each other to form a loop. The end of the second battery assembly 4-2 is inserted and fixedly installed in the first battery assembly 4-1 to improve the battery assembly. The overall strength improves the vibration resistance and meets the higher requirements of the tool.

The first battery assembly 4-1 and the second battery assembly 4-2 are vertically connected to each other, the first battery assembly 4-1 is arranged in a row, and the second battery assembly 4-2 is arranged in a barrel shape. Preferably, the first battery assembly Both 4-1 and the second battery assembly 4-2 are equipped with four batteries. The first battery assembly 4-1 is in a flat shape, and the second battery assembly 4-2 is in two rows and two rows of overlapping rectangular shapes, so as to facilitate the assembly The second battery assembly 4-2 is inserted and installed into the tool to improve the stability of the battery assembly.

The first battery assembly 4-1 includes 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 the battery mounting frame 4-8, and the base cover 4- 3 It is fixedly installed on the base 4-4, and the base 4-4 and the base cover 4-3 fully wrap the lower battery pack 4-5 to improve the strength of the first battery assembly 4-1.

The upper end surface of the base cover 4-3 is provided with a battery installation slot 4-6, the second battery assembly 4-2 is fixedly installed in the battery installation slot 4-6, the second battery assembly 4-2 and the lower battery pack 4 -5 connection, the battery mounting frame 4-8 is used to fix the battery, the second battery assembly 4-2 is fixedly connected to the base cover 4-3 through the lower battery pack 4-5, thereby improving the integrity of the battery assembly and improving the battery Strength of.

The lower battery pack 4-5 includes batteries 4-7, battery mounting brackets 4-8 and first conductive sheet 4-9. The battery mounting brackets 4-8 are fixedly installed in the base 4-4, and the batteries 4-7 are fixedly installed in the base 4-4. In the battery mounting frame 4-8, the first conductive sheet 4-9 is fixedly installed on both sides of the battery mounting frame 4-8, and the first conductive sheet 4-9 is connected to the battery 4-7 through the first conductive sheet 4- 9 Connect the batteries 4-7 to each other. The battery mounting frame 4-8 is used to install the batteries, and is used to connect the second battery assembly 4-2 and the base cover to improve the integrity and strength of the lower battery pack 4-5.

The upper end surface of the battery mounting frame 4-8 is provided with a clamping slot 4-10, and the second battery assembly 4-2 is fixedly installed in the clamping slot 4-10 to facilitate the second battery assembly 4-2 and the battery mounting frame 4-8 connection to improve installation efficiency.

The second battery assembly 4-2 includes a battery sleeve 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 both fixedly installed on the battery 4 The two ends of -7 form an upper battery pack, which is fixedly connected to the first battery assembly 4-1, that is, the upper battery pack is fixedly connected to the battery mounting frame 4-8, and a battery sleeve 11 is sleeved on the outer side of the upper battery pack, The upper battery pack is wrapped by the battery cover 11 to improve the overall strength of the upper battery pack.

A second conductive sheet 4-14 is fixedly installed on the lower end plate 4-12 of the battery, and the second conductive sheet 4-14 is connected to the lower battery pack 4-5, thereby connecting the first battery assembly 4-1 and the second battery assembly 4 -2 battery is connected, the stroke loop.

The battery upper end plate 4-13 includes a battery rack 4-15. The battery upper end plate is equipped with a conductive plate 4-16. The battery rack 4-15 is fixedly connected to the battery 4-7. The battery rack 4-15 is provided with a third conductive plate. Sheet 4-17, the third conductive sheet 4-17 is fixedly connected to the conductive plate 4-16, the third conductive sheet 4-17 is connected to the upper battery pack, and the conductive plate 4-16 is also connected to the first battery assembly 4-1, That is, the electrical conductive plate 4-16 is connected to the first electrical conductive sheet 4-9, so that the batteries 4-7 are connected to each other.

Reeds 4-18 are provided on the upper end surface of the conduction plate 4-16, connecting terminals 4-19 are fixedly installed on the upper end surface of the battery sleeve 11, and inserts 4-20 are provided in the connecting terminals 4-19. The insert 4-20 and the reed 4-18 are detachably connected, and the battery pack can be easily connected to the working circuit through the connecting terminal 4-19.

The brushless motor shown in Figure 21-Figure 23 includes a rotor core shaft 5-1, a rotor blade 5-2, a rotor spacer 5-3, a fan blade 5-4, a magnet 5-5 and a balance ring 5- 6. The rotor blade 5-2 is firmly connected with the rotor core shaft 5-1, the fan blade 5-4 is connected with the end of the rotor blade 5-2 close to the output shaft, the fan blade 5-4 and the rotor blade 5-2 The size and positioning of the rotor are compatible with the positioning files 5-11 on the rotor core shaft 5-1. The magnetic steel 5-5 is placed in the magnetic steel groove 5-7 of the rotor punching piece 5-2 in order of polarity, and the shape of the magnetic steel 5-5 is the same as the shape of the magnetic steel groove 5-7 of the rotor punching piece 5-2. Match; the size of the magnet 5-5 is generally slightly larger than the size of the rotor punching piece 5-2. The part of the magnet 5-5 that exceeds the height of the rotor punching piece 5-2 is provided with a rotor spacer 5-3. The rotor spacer 5-3 and the rotor punching piece 5-2 completely cover the magnetic steel 5-5, so as to compensate a series of problems caused by the inconsistent stacking height of the rotor punching piece 5-2 through the rotor spacer 5-3. The balance ring 5-6 is set at the open end of the rotor blade 5-2. Only one balance ring 5-6 is used. The whole is a stepped circular column with a cylindrical through hole in the middle. The size of the through hole is consistent with the rotor core shaft. Corresponding to 5-1, it will play the role of closing and tightening the open end of the rotor punching piece 5-2. A specific setting position of the 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 of punching and pressing size positioning and balance ring 5 The function of -6 greatly reduces the overall manufacturing cost.

The punching gear position of the rotor core shaft 5-1 adopts the knurling and then finishing grinding process, which greatly guarantees the pushing force and the related parts of the rotor core shaft 5-1 and the rotor punching blade 5-2. Torque requirements.

The design of Magnet 5-5 uses a combination of in-line and surface-mounting. Specifically, the N poles of the magnetic steel grooves 5-7 of the rotor punching piece 5-2 adopt a regular structure, and the S poles of the magnetic steel grooves 5-7 of the rotor punching piece 5-2 adopt an irregular structure; or vice versa, that is, The S poles of the magnetic steel grooves 5-7 of the rotor punching piece 5-2 adopt a regular structure, and the N poles of the magnetic steel grooves 5-7 of the rotor punching piece 5-2 adopt an irregular structure. In the production process, the installation positions of the N pole and the S pole are unique, which has the effect of foolproof operation. The shape of the magnetic steel 5-5 matches the shape of the magnetic steel groove 5-7 of the rotor punching piece 5-2; the regular structure adopts an arc shape, and the irregular structure adopts two straight sides and the angle between the two straight sides. Between 135° and 160°. The design of N-pole magnet and S-pole magnet makes it extremely close to the outer diameter surface of the rotor punching sheet 5-2, thereby improving the utilization of the magnet 5-5 performance and improving the motor performance.

In summary, when the knob 8 is rotated to the corresponding functional position, the movement distance of the dial 2-1 is limited by controlling the protrusion and the corresponding protrusion 13. Specifically, taking the electric hammer device as an example, when the knob 8 is in the hammer drill position and the electric hammer standby operation is started, the dial block 2-1 is pushed out by the return spring 2, and the dial block 2-1 will drive the rotating sleeve structure 11 and The clutch 9 moves outwards. At this time, the clutch 9 is in a disengaged state from the pendulum bearing 10, and the pendulum bearing 10 does not work. That is, the rotating sleeve gear 12 on the rotating sleeve structure 11 meshes with the gear on the clutch 9. When the rotating sleeve gear 12 rotates, the entire device only rotates without hammering, and the whole machine does not emit empty hammer noise. When the electric hammer starts the hammer drilling operation, the electric hammer will press the rotating sleeve structure 11 to move backward; the shift block 2-1 compresses the return spring 2, and the shift block 2-1 also drives the clutch 9 to move backward at the same time. The pendulum bearing 10 is engaged, the pendulum bearing 10 starts to work, and the swivel part is hammered. Therefore, the electric hammer realizes the functions of hammering and drilling at the same time, and the whole machine performs hammer drilling operations.

In this solution, the motor on the side of the bracket 3-2 drives the swing rod bearing 10 and the clutch 9 to operate the electric tool. During operation, the cylinder moves back and forth to generate internal pressure. Because the front end of the rotating sleeve of the power tool, the head shell and the bracket 3-2 have been sealed, which will cause the internal temperature of the power tool to rise and the lubricating oil to change during continuous operation. Lean, under the action of internal pressure, the lubricating oil will leak from the weaker sealing performance. Through the setting of the same air channel, the internal and external air pressure is balanced to reduce the leakage of lubricating oil after thinning. At the same time, the setting of the filter prevents the gas from being discharged directly and achieves the effect of avoiding leakage.

In this solution, the fan blade 5-4, the rotor core shaft 5-1, and the rotor punching piece 5-2 can be integrally press-fitted and positioned through a reasonably designed tooling fixture, which can greatly improve production efficiency and reduce repeated positioning. To superimpose the tolerance error, while replacing the traditional fan blade 5-4 and balance ring 5-6 by the fan blade 5-4, the cost is greatly reduced, because it adds the rotor spacer 5-3, thereby eliminating the rotor punching blade 5- 2 A series of problems caused by inconsistent stack height. The special rotor punching piece 5-2 design can not only improve its convenience and work efficiency in work, give full play to the performance of the magnetic steel 5-5, but also play a foolproof role in the production process.

In addition, the battery pack design of this solution is simple and reasonable, has a stronger endurance, and can meet high-current operations.

The above are only the preferred embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present utility model, several improvements and modifications can be made, and these improvements and modifications are also Should be regarded as within the scope of protection of the utility model.

Claims

A new type of electric hammer, which is characterized in that it includes an electric tool body, a bracket, a pendulum bearing transmission structure, a brushless motor and a battery assembly; the bracket is arranged inside the electric tool body, and the brushless motor and the battery assembly are respectively arranged on two sides of the bracket. Side; a through hole is provided in the middle of the bracket for the gears of the brushless motor to pass through, and a placement hole is provided under the through hole for the pendulum rod bearing transmission structure to pass through; the pendulum rod bearing transmission structure meshes with the motor;

The pendulum bearing transmission structure includes a pendulum bearing, a clutch, an intermediate shaft and a cylinder; one side of the pendulum bearing is connected with the clutch; the intermediate shaft penetrates the pendulum bearing, one end of the intermediate shaft is connected with the brushless motor through a primary driven wheel, and the other end is connected with the brushless motor Clutch connection; cylinder and pendulum rod bearing connection;

The end of the pendulum bearing transmission structure away from the brushless motor is provided with a passive reset structure for the shift block, which includes a shift block, a return spring, and a fixing piece; the return spring is arranged between the shift block and the fixing piece; the shift block is provided with a fixed return spring connected The convex block, the fixed part is provided with a groove for placing the return spring; a guide groove and a guide post are arranged between the shift block and the fixed part, and the guide post is provided with a lead angle at one end of the guide groove;

Set the airway on the stent, and the airway is set at the upper end of the stent; the airway includes the main airway and the side air holes, the main airway and the side air holes are connected; the main airway includes the tip, the connecting part, the connecting part and the filter placement The tip part is conical as a whole, the communicating part and the filtering placement part are cylindrical, the diameter of the filtering placement part is larger than the diameter of the communicating part, and the communicating part and the filtering placement part are connected by the joint part; wherein the joint part is close to the filter The diameter of the placing part is the largest, and the diameter of the connecting part close to the connecting part is the smallest;

The battery assembly includes a first battery assembly and a second battery assembly, the first battery assembly is electrically connected to the second battery assembly, and the end of the second battery assembly is inserted and fixedly installed in the first battery assembly;

The first battery assembly is electrically connected to the second battery assembly, the end of the second battery assembly is inserted and fixedly installed in the first battery assembly, the first battery assembly and the second battery assembly are connected perpendicularly to each other, and the first battery assembly is arranged in rows , The second battery assembly is arranged in a barrel shape;

The brushless motor includes the rotor core shaft, the rotor blade, the rotor spacer, the fan blade, the magnetic steel and the balance ring; the rotor blade and the rotor core shaft are tightly connected, and the fan blade is connected to the end of the rotor blade near the output shaft , The magnets are placed in the magnetic steel groove of the rotor punching piece in order of polarity, the part of the magnets that exceeds the height of the rotor punching piece is provided with a rotor spacer, and the balance ring is set at the open end of the rotor punching piece; wind blades, rotor punching pieces The size and positioning of the rotor are adapted to the positioning gear on the rotor shaft.
A new type of electric hammer according to claim 1, characterized in that: the pendulum bearing includes an outer ring, a steel ball and an inner ring, the steel ball is arranged between the outer ring and the inner ring, and the steel ball and the outer ring and the inner ring Contact, the angle between the outer ring and the horizontal direction is greater than 16.5°; the side of the outer ring close to the inner ring and the side of the inner ring close to the outer ring are provided with grooves, and the shape of the groove is adapted to the steel ball; the outer ring is horizontal The direction angle is 18° to 20°.
A new type of electric hammer according to claim 2, characterized in that: the outer ring includes a pendulum rod and an outer ring body, the closer the outer ring body is to the pendulum rod, the greater the thickness; the connection between the pendulum rod and the outer ring body is provided with a transition At the transition point, the arc shape is adopted and the thickness is greater than the thickness of other parts of the outer ring body;

The inner ring includes an inner ring body, a driving key and a connecting part. The driving key and the connecting part are arranged oppositely on both sides of the inner ring body; the inner ring body is spherical and has a through hole, which passes through the inner ring body, the driving key and the connecting part. The center of the part; the driving key includes a ring disc and a driving column, the driving column includes two and is arranged oppositely on the ring disc; the connecting part adopts a ring column shape; the connecting part contacts the clutch groove, the shape of the clutch groove and the connecting part The shape matches.
A new type of electric hammer according to claim 1, characterized in that it further comprises a knob, which controls the dial; the knob is provided with a control protrusion, and the dial is provided with a protrusion corresponding to the control protrusion; the knob includes a knob The main body, the connecting spring, and the clamping member; the knob body is provided with a clamping member, and the clamping member and the knob body member are provided with a connecting spring; the control protrusion adopts a cylindrical shape, and the protrusion adopts a sheet shape.
A new type of electric hammer according to claim 1, characterized in that: a filter device is provided on the air passage; the filter device adopts a filter mesh, which is cylindrical as a whole; and a positioning baffle is provided on the main body of the electric tool corresponding to the filter device.
A new type of electric hammer according to claim 1, characterized in that: the first battery assembly includes a base, a base cover and an upper battery pack, the upper battery pack is fixedly installed in the base, and the base cover is fixedly installed on the base. On the base; on the upper end surface of the base cover is provided with a battery installation slot, the second battery assembly is fixedly installed in the battery installation slot, the second battery assembly is connected with the lower battery pack.
A new type of electric hammer according to claim 1, characterized in that: the second battery assembly includes a battery sleeve, a battery upper end plate, an electrical conduction plate, a battery lower end plate and a battery, the electrical conduction plate is installed on the battery upper end plate, and the battery upper end plate The upper battery pack and the battery lower end plate are fixedly installed at both ends of the battery to form an upper battery pack. The upper battery pack is fixedly connected to the first battery assembly, and a battery cover is sleeved on the outer side of the upper battery pack; the second conductivity is fixedly installed on the battery lower end plate The second conductive sheet is connected to the first battery assembly; the upper end plate of the battery includes a battery rack, the battery rack is fixedly connected to the battery, a third conductive sheet is provided in the battery rack, and the third conductive sheet is fixedly connected to the conductive plate. The conductive sheet is connected to the upper battery pack.
A new type of electric hammer according to claim 1, characterized in that: the N pole of the magnetic steel groove of the rotor punching piece adopts a regular structure, and the S pole of the magnetic steel groove of the rotor punching piece adopts an irregular structure; or vice versa. ; The shape of the magnetic steel matches the shape of the magnetic steel groove of the rotor punching piece; the size of the magnetic steel is larger than the size of the rotor punching piece; among them, the regular-shaped structure adopts an arc shape, and the irregular-shaped structure adopts two straight sides and two straight sides. The angle between the sides is between 135° and 160°.