CN101204740A

CN101204740A - Impact drill

Info

Publication number: CN101204740A
Application number: CNA200610166497XA
Authority: CN
Inventors: 强尼·鲍瑞那图
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2006-12-19
Filing date: 2006-12-19
Publication date: 2008-06-25
Anticipated expiration: 2026-12-19
Also published as: CN101204740B

Abstract

The invention relates to a percussion drilling used for processing a work-piece which includes a shell, a motor arranged in the shell, an aiguille arranged outside the shell and extending along the axial direction, an energy storage block driven by the rotation of the motor and a drive block which keeps relatively fixed with the aiguille. The energy storage block and the drive block are all provided with an end tooth that can cooperate mutually. The drive block is provided with a moving distance along the axial direction and an elastic piece is supported on the energy storage block so as to provide an axial reposition of the energy storage block. When the end tooth of the energy storage block is engaged with the end tooth of the drive block, the end tooth of the drive block can generate a radial force component and an axial force component. Through the structure, the percussion drilling can not only provide a steering effort of the aiguille, but also can provide an impulse force for the aiguille to the work-piece along the axial direction; thereby reducing the acting force needed to be applied by an operator.

Description

Percussion drill

Technical field

The present invention relates to a kind of hand held electric tool, relate in particular to a kind of hand-held hammering drill.

Background technology

Existing percussion drill can be with reference to shown in Figure 6, and it generally includes casing 81, is arranged on the interior motor 82 of casing, extends the outer output shaft of casing, and output shaft is driven by reduction gearing by the motor arbor.One end of output shaft is provided with drill chuck, fixedly contains drill bit 83 in it, is used for holing on workpiece, and the close other end place of output shaft is fixedly connected with an active toothed disk 91, and being circle distribution thereafter on the end face usually has 16 moved end teeth 911.One fixed tooth disk 92 is fixedly installed on the casing 81, and its front end face is relative with the rear end face of active toothed disk, and is provided with 16 quiet end teeth 921 that cooperate with the moved end tooth on the front end face equally.Between active toothed disk and quiet fluted disc, be provided with a gap, be provided with a spring 93 therebetween.When percussion drill is started working, starter, the motor arbor drives output shaft, and further drives the drill bit rotation; When drill bit is pressed on the workpiece, owing to be subjected to the reaction force of workpiece, drill bit, drill chuck, output shaft, active toothed disk will move together backward until moved end tooth and the engagement of fixed end tooth.Yet owing to ordering about of motor arbor, the moved end tooth can't keep engagement with quiet end tooth all the time, and it can be rotated further and the escape engagement.Because fixed tooth disk is maintained fixed with respect to casing, so at the moved end tooth by being engaged in the out-of-gear process, drill bit has in the axial direction with respect to casing motion forward, and because the casing person of being operated pushes up all the time to workpiece, engagement constantly can form drill bit in the axial direction to the lasting impact of workpiece with breaking away between this moved end tooth like this and quiet end tooth, add the continuous rotation of drill bit self, thereby improved the operating efficiency of drill bit.

Yet, need the operator to apply certain axial force during the work of the percussion drill of this structure and overcome the elastic force of spring 93 so that moved end tooth 911 and quiet end tooth 921 engagements.Be that drill bit in fact all comes from the operator to the impulsive force of workpiece in the axial direction, so it is more special to work as the position of workpiece, as when being positioned at the operator's above-head or the crown, the operator not only needs to overcome the very large gravity of percussion drill self, and the impulsive force of drill bit to workpiece need be provided, obviously this is very difficult for the operator.In addition, even the position of workpiece is normal,, all can be directly passed to the operator from the reaction force of workpiece, thereby be easy to cause fatigue because of in impact process to workpiece.

Summary of the invention

The invention provides a kind of percussion drill, it can be when providing the drill bit steering force, provides drill bit vertically to the active impulsive force of workpiece, thereby improve drilling efficiency and reduce the required active force that applies of operator, use comfortable, and operator's indefatigability.

For achieving the above object, technical scheme of the present invention is: a kind of percussion drill, be used for workpiece is processed, this percussion drill comprises casing, be arranged on the motor in the casing, be arranged on the outer and axially extended drill bit of casing, keep relatively-stationary drive block by the energy storage piece of motor rotation driving with drill bit; Be equipped with the end tooth that can cooperatively interact on energy storage piece and the drive block; Drive block has a displacement in the axial direction, and an elastic component and energy storage piece be against providing the energy storage piece axially to reset, and energy storage piece end tooth is when meshing with the drive block end tooth, and the drive block end tooth can produce radially and axial thrust load.

As a further improvement on the present invention, described energy storage piece is provided with first end tooth, it is domatic that this first end tooth has first rising that is obliquely installed, drive block is provided with second end tooth, it is domatic that this second end tooth has second rising that is obliquely installed, energy storage piece end tooth is when meshing with the drive block end tooth, and the energy storage piece can rise domatic and the domatic cooperation of second rising drives drive block by first.

As a further improvement on the present invention, the quantity of first end tooth of described energy storage piece is less than 5, and be distributed in the energy storage piece with central angle such as being with the drive block facing surfaces on, the quantity of second end tooth of described drive block is less than 5, and be distributed in drive block with central angle such as being with energy storage piece facing surfaces on.

Compared with prior art, the invention has the beneficial effects as follows: during the engagement of energy storage piece and drive block, the energy storage piece can provide the component of drive block on radial and axial, thereby provides drill bit to creep into the required rotation of workpiece and to the lasting impact of workpiece.In this way, the output of motor not only can provide the required steering force of rotation of drill bit, also initiatively provide the drill bit impact workpiece needed axial impact force, so, the required axial force that applies of operator when having reduced percussion drill work to a great extent, alleviated operator's burden, and the handled easily person uses.In addition, first end tooth on the energy storage piece and the quantity of second end tooth on the drive block are all less, and it is more sparse to arrange, thereby makes the acceleration time of energy storage piece between adjacent two end teeth of drive block enough long, and then the kinetic energy when guaranteeing the energy storage piece to the bump of drive block is enough big.

Description of drawings

The invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is the floor map of percussion drill of the present invention and internal structure thereof, and wherein percussion drill is about to impact a surface of the work.

Fig. 2 is the partial enlarged drawing of the percussion drill among Fig. 1, has wherein disclosed transmission system and the energy storage piece of transmission system and the fit structure of motor arbor of percussion drill.

Fig. 3 is along the schematic diagram after A-A line direction is cut open among Fig. 1.

Fig. 4 is the respective view of drive block when two different visual angles of percussion drill of the present invention.

Fig. 5 is the respective view of energy storage piece when two different visual angles of percussion drill of the present invention.

Fig. 6 is the floor map of percussion drill of the prior art and internal structure thereof.

The specific embodiment

As shown in Figure 1, the present invention has disclosed a kind of percussion drill 1, be used on workpiece 5 boring, it comprises casing 10, be arranged at motor-driven system in the casing 10, extend outer hole-drilling system of casing and the transmission mechanism that the generation driving force of motor-driven system is passed to hole-drilling system.Wherein casing 10 have horizontally extending horizontal cavity 11, by the roughly extended straight down handle 12 of horizontal cavity be positioned at the power brick 13 that handle 12 bottoms are used to provide electric power.Handle 12 is provided with shift knob 14, is used to control the switching of motor, and the operator can come the rotating speed of governor motor by the degree of depth of pushing button simultaneously.Motor-driven system is housed in the rear side of the horizontal cavity of casing, and it comprises motor body 21 that is fixedly installed in the casing 10 and the motor arbor 22 that extend horizontally away forward from motor body 21.Hole-drilling system comprises by extended drill chuck 31 of the front end of casing 10 and the horizontally extending drill bit 32 that fixedly is housed in the drill chuck 31.

Cooperate with reference to shown in Figure 2, transmission system comprises energy storage piece 41 that is connected with motor-driven system and the drive block 42 that is connected with hole-drilling system.Energy storage piece 41 is arranged on the free end of motor arbor 22, in the present embodiment, motor arbor 22 is provided with along its axially extended strip positioning key 221 at its circumferential surface, is concaved with the strip locating slot 416 that is used to accommodate this positioning key 221 on the energy storage piece 41.As shown in Figure 3, along on the circumferencial direction of motor arbor 22, the size of the size of locating slot 416 and positioning key 221 is roughly suitable, so makes the energy storage piece to rotate synchronously with the rotation of motor arbor.It should be noted that along on the axis direction of motor arbor 22, the size of locating slot 416 is greater than the size of positioning key 221,, make the energy storage piece 41 can be with respect to the axially-movable of motor arbor 22 along the motor arbor by this structure.For what those of ordinary skill in the art can expect easily be, the position of positioning key 221 and locating slot 416 is interchangeable, is about to positioning key and is arranged on the energy storage piece, and locating slot is arranged on the motor arbor; In addition, positioning key 221 and locating slot 416 also can adopt other shapes, are the ball shape as positioning key, and locating slot is groove shape etc. in the shape of a spiral.Drive block 42 and drill chuck 31 Joints also keep at a certain distance away, and wherein drive block 42 is housed in the front bulkhead 111 of the horizontal cavity 11 interior and close casings of casing 10.

Cooperation is with reference to Fig. 4 and shown in Figure 5, be respectively equipped with some first end teeth 410 and second end tooth 420 that can cooperatively interact on the front end face of energy storage piece 41 and on the rear end face of drive block 42, in the present embodiment, the quantity of first end tooth 410 and second end tooth 420 is two, and 180 degree are distributed on the circumference of corresponding end-faces at interval.First and second end tooth 410,420 has respectively to rise from the opposing end surface of energy storage piece 41, drive block 42 extended obliquely first and domatic 411 and second rises domaticly 421, and folder is established and is formed with the first rising slope angle a1 and the second rising slope angle a2 respectively and between corresponding end-faces.First and second end tooth 410,420 also has first respectively and descends and domatic 412 and second to descend domaticly 422, and these descend and domaticly are formed with the first decline slope angle b1 and the second decline slope angle b2 with corresponding end-faces respectively.All be formed with horizontal top surface 413,423 in first rising domatic 411 and first decline domatic 412 and second rising domatic 421 and second domatic 422 of the decline.Transmission system also comprises an elastic component 43, but it is arranged on energy storage piece 41 rear portions and elasticity compresses the energy storage piece and force the energy storage piece towards drive block 42 motions.In the present embodiment, this elastic component 43 is a helical spring, it is set on the motor arbor and between energy storage piece 41 and motor body 21, in state shown in Figure 1, spring is in the flexible state of nature, and its front-end and back-end are resisted against respectively on the front end face of the rear end face of energy storage piece 41 and motor body 21.One limited part 44 is arranged between casing 10 and the drill chuck 31, in the present embodiment, this limited part 44 is a spring, because its existence, make the rear end face of drill chuck 31 and the front end face 111 of casing 10 guarantee a specific range d (as shown in Figure 1) at interval, thereby when percussion drill was worked, drill bit 32, drill chuck 31 and drive block 42 can move in this specific range vertically.

Figure 1 shows that percussion drill 1 is in the original state when not working, cooperate with reference to shown in Figure 2, at this moment, positioning key 221 on the motor arbor 22 is positioned at the rear portion of the locating slot 416 of energy storage piece 41, that is to say, energy storage piece 41 is positioned at motor arbor 22 foremost, and drive block 42 is pressed close to the front bulkhead 111 of casing.Because the effect of limited part 44, the spacing of the front bulkhead 111 of drill chuck 31 and casing is d, and the horizontal top surface 423 of second end tooth 420 of drive block 42 also is roughly d to the spacing of the front end face of energy storage piece 41.First end tooth 410 of the energy storage piece 41 shown in Fig. 1 and second end tooth 420 of drive block 42 are in not engagement, and phase phasic difference 90 degree.When percussion drill 1 was started working, at first operator presses press button 14 was with starter, and energy storage piece 41 can rotate with motor arbor 22, and before being pressed into drill bit 32 on the workpiece 5, drive block 42 remains static all the time.After being pressed into drill bit 32 on the workpiece 5, be subjected to the reaction force of workpiece, the motion backward together vertically of drill bit 32, drill chuck 31 and drive block 42, limited part 44 is compressed simultaneously, near 0, at this moment, energy storage piece 41 and drive block 42 are in engageable state up to the distance of drill chuck 31 and casing front bulkhead 111, when first rising domatic 411 of first end tooth 410 contacts with second rising domatic 421 of second end tooth 420, drive block 42 will rotate with energy storage piece 41.Creep in the process of workpiece 5 at drill bit 32, drill bit 32 can be subjected to along its axial resistance, also can be subjected to the resistance that turns to along it simultaneously, when steering drag near or greater than 22 pairs of energy storage pieces 41 of motor arbor turn to driving force the time, second rising domatic 421 of domatic 411 and second end tooth 420 is and is obliquely installed because first of first end tooth 410 rises, and at this moment energy storage piece 41 and drive block 42 can produce relative displacement in the axial direction.That is to say, energy storage piece 41 is activated the resistance that piece 42 is turning to when driving drive block 42, then first of first end tooth 410 rises domatic 411 meetings with respect to the relative slippage of domatic 421 generations of second rising of second end tooth 420, in this process, energy storage piece 41 can continue to drive drive block 42 and rotate, the piece of energy storage simultaneously 41 can move and compression elastic piece 43 backward with respect to drive block 42, breaks away from second end tooth 420 up to first end tooth 410 to cooperate.Thereafter, first end tooth 410 can be crossed the horizontal top surface 423 of second end tooth 420 rapidly, and under the driving of motor arbor 22, energy storage piece 41 begins to quicken rotation, simultaneously, energy storage piece 41 under the effect of the restoring force of elastic component 43 by compression, ram drive piece 42 forward rapidly, make the front bulkhead motion of drive block 42, and then drive the axial impact of 32 pairs of workpiece of drill bit, 5 formation towards casing 10.

After energy storage piece 41 turned over 180 degree, second decline domatic 422 of domatic 411 meetings of first rising of first end tooth 410 and second end tooth 420 cooperated, and rotated to drive second end tooth 420.Equally, under the steering drag effect of drill bit 32, first end tooth 410 will be crossed second end tooth 420 and make energy storage piece 41 ram drive pieces 42 and the impact of 32 pairs of workpiece 5 of formation drill bit.So move in circles, energy storage piece 41 also provides the impact of 32 pairs of workpiece 5 of drill bit when drill bit 32 rotations are provided, thereby improves the operating efficiency of percussion drill greatly.Certainly, if the rotating speed of motor arbor is enough fast, after the energy storage piece turns over 180 degree, drive block also is not returned to initial position, at this moment, first of first end tooth rise domatic can with descend domatic cooperation and directly cross second end tooth of second of second end tooth, and turn over next 180 degree backs and second end tooth second rising is domatic cooperates again.

Kinetic energy when guaranteeing the energy storage piece to the bump of drive block is enough big, the quantity of the quantity of first end tooth of energy storage piece and second end tooth of drive block is too much unsuitable, it is also unsuitable overstocked to arrange, preferably the quantity of the end tooth of energy storage piece and drive block all is less than 5, and is evenly distributed on the surface near the disc of circumference with central angle such as being.The quantity of first end tooth and second end tooth is 2 in the present embodiment.In addition, can relatively easily cross second end tooth for making first end tooth, the second rising slope angle setting of second end tooth can be not excessive, usually less than 60 degree, in the present embodiment, this angle is about 30 degree, and the first rising slope angle of first end tooth can be roughly the same with the second rising slope angle, promptly equal or can be slightly big or be slightly smaller than the second rising slope angle, also can differ a bigger value with the second rising slope angle.After making first end tooth cross the horizontal top surface of second end tooth, can quicken to produce bigger kinetic energy rapidly, it is bigger that the second decline slope angle of second end tooth is provided with ground usually, usually suit between 80 degree and 90 degree, and the first decline slope angle of first end tooth can be roughly the same with the second decline slope angle, promptly equal or can be slightly big or be slightly smaller than the second decline slope angle, also can differ a bigger value with the second decline slope angle.In addition, have bigger kinetic energy when making energy storage piece ram drive piece, the quality of energy storage piece is much bigger with respect to the quality of drive block, is at least three times of drive block quality usually, so, can make drill bit that workpiece is produced bigger impulsive force.

Cooperate shown in Figure 2, among the present invention, because first end tooth of energy storage piece and second end tooth of drive block are equipped with the domatic of inclination, so when energy storage piece and drive block engagement and the motion of drive drive block, the directed force F 2 that directed force F 1 that the energy storage piece produces drive block and drive block produce the energy storage piece all can decompose produce component F1d, F2d that the footpath makes progress and axially on component F1a, F2a, wherein radial component can provide drill bit to creep into the required rotation of workpiece, and axial thrust load then can provide the lasting impact of drill bit to workpiece.In this way, the output of motor not only can provide the required steering force of rotation of drill bit, also initiatively provide part drill bit impact workpiece needed impulsive force, so, the required active force that applies of operator when having reduced percussion drill work to a great extent, alleviated operator's burden, evolution just operator uses.In addition, first end tooth on the energy storage piece and the quantity of second end tooth on the drive block are all less, and it is more sparse to arrange, thereby makes the acceleration time of energy storage piece between adjacent two end teeth of drive block enough long, and then the kinetic energy when guaranteeing the energy storage piece to the bump of drive block is enough big.

Claims

1. a percussion drill is used for workpiece is processed, and it is characterized in that: this percussion drill comprises casing, be arranged on the motor in the casing, be arranged on the outer and axially extended drill bit of casing, keep relatively-stationary drive block by the energy storage piece of motor rotation driving with drill bit; Be equipped with the end tooth that can cooperatively interact on energy storage piece and the drive block; Drive block has a displacement in the axial direction, and an elastic component and energy storage piece be against providing the energy storage piece axially to reset, and energy storage piece end tooth is when meshing with the drive block end tooth, and the drive block end tooth can produce radially and axial thrust load.

2. percussion drill according to claim 1, it is characterized in that: the energy storage piece is provided with first end tooth, it is domatic that this first end tooth has first rising that is obliquely installed, drive block is provided with second end tooth, it is domatic that this second end tooth has second rising that is obliquely installed, energy storage piece end tooth is when meshing with the drive block end tooth, and the energy storage piece can rise domatic and the domatic cooperation of second rising drives drive block by first.

3. percussion drill according to claim 2, it is characterized in that: the quantity of first end tooth of described energy storage piece is less than 5, and be distributed in the energy storage piece with central angle such as being with the drive block facing surfaces on, the quantity of second end tooth of described drive block is less than 5, and be distributed in drive block with central angle such as being with energy storage piece facing surfaces on.

4. percussion drill according to claim 3 is characterized in that: the quantity of first end tooth of described energy storage piece is 2, and the quantity of second end tooth of described drive block is 2.

5. percussion drill according to claim 1 is characterized in that: described elastic component is a helical spring, but the distortion of its axial elasticity so that the energy storage piece impact towards drive block, thereby the motion that when the rotatablely moving of drill bit is provided, provides drill bit shaft to make progress.

6. percussion drill according to claim 1, it is characterized in that: described motor has arbor, described energy storage piece is arranged on the arbor, this both junction of one of described arbor and energy storage piece axially is provided with positioning key along arbor, and both another is provided with the locating slot of accommodating this positioning key; Along on the circumferencial direction of arbor, the size of locating slot and the size of positioning key are roughly suitable, and along arbor axially on, the size of locating slot is greater than the size of positioning key.

7. percussion drill according to claim 1 is characterized in that: described drive block is arranged in the casing and near the end wall of percussion drill working end, and percussion drill also comprises and is arranged on the limited part that the described end wall outside is used to provide described displacement.

8. percussion drill according to claim 1 is characterized in that: percussion drill also comprises drill chuck, and this drill chuck is fixedlyed connected with described drive block, and fixedly accommodates described drill bit.

9. according to claim 2,3 or 4 described percussion drills, it is characterized in that: first of described first end tooth rises domatic and the surface energy storage piece forms the first rising slope angle, and second of described second end tooth rises domatic and surface drive block forms the second rising slope angle; The described first rising slope angle is at least roughly suitable with the second rising slope angle.

10. percussion drill according to claim 9 is characterized in that: the described first rising slope angle and the second rising slope angle are all less than 60 degree.

11. percussion drill according to claim 10 is characterized in that: the described first rising slope angle and the second rising slope angle are about 30 degree.

12. percussion drill according to claim 9, it is characterized in that: it is domatic that described first end tooth also has first decline, the surface of itself and energy storage piece forms the first decline slope angle, and described second end tooth also has second and descends domaticly, and the surface of itself and drive block forms the second decline slope angle; The described first decline slope angle is at least roughly suitable with the second decline slope angle.

13. percussion drill according to claim 12 is characterized in that: described first and second decline slope angle is respectively greater than first and second rising slope angle.

14. percussion drill according to claim 12 is characterized in that: the described first decline slope angle and the second decline slope angle are all between 80 degree and 90 degree.

15. percussion drill according to claim 12 is characterized in that: domatic and descend domatic and be formed with a horizontal top surface in the rising of each end tooth.

16. percussion drill according to claim 1 is characterized in that: the quality of described energy storage piece is three times of quality of drive block at least.