CN218556991U

CN218556991U - Impact electric tool

Info

Publication number: CN218556991U
Application number: CN202121776482.1U
Authority: CN
Inventors: 曹健; 黄承志
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2023-03-03
Anticipated expiration: 2031-07-30

Abstract

An impact electric tool comprises an impact system and a rotation system, wherein the rotation system comprises a cylinder, a clutch sleeve and an output gear, the clutch sleeve and the output gear are sleeved on the cylinder, the clutch sleeve is pressed against the output gear backwards, the impact system comprises a piston arranged at the rear end inside the cylinder in a sliding mode and a hammer located in front of the piston, the piston and the hammer are arranged at intervals and enclose a cavity together with the cylinder, the cylinder is provided with a ventilation hole penetrating through the cavity from the periphery, the ventilation hole is covered by an inner ring of the clutch sleeve, a plurality of ventilation holes are formed in the clutch sleeve in the axial direction, and one of the plurality of ventilation holes is arranged opposite to the ventilation hole. The air holes are additionally formed in the clutch sleeve, so that the slotting in the inner ring of the clutch sleeve is avoided, and the strength of the clutch sleeve is increased.

Description

Impact electric tool

[ technical field ]

The utility model relates to an electric tool field, in particular to impact electric tool of hammer pick class.

[ background art ]

The impact electric tool such as a multifunctional electric hammer is provided with a rotating system and an impact system, wherein the rotating system comprises a cylinder, an output gear sleeved at the rear end of the cylinder, a clutch sleeve engaged and connected to the front of the output gear and a knob for driving the clutch sleeve to slide back and forth and position; the impact system comprises a piston arranged at the rear end in the cylinder in a sliding manner and a hammer located in front of the piston, the piston and the hammer are arranged at intervals and jointly enclose a cavity with the cylinder, and the cylinder is provided with a ventilation hole penetrating from the periphery to the cavity; the inner ring of separation and reunion cover covers the draught hole, and in the design scheme of traditional multi-functional electric hammer, all seted up the slot at the inner ring of separation and reunion cover to supply the draught hole to take a breath, but this slot passes the inner ring of separation and reunion cover along fore-and-aft direction, greatly reduced the intensity of separation and reunion cover, perhaps again in order to guarantee to set up separation and reunion cover still has high strength behind the slot, the designer has increaseed the thickness of separation and reunion cover, and this design leads to the weight increase of multi-functional electric hammer again.

Therefore, there is a need for a new impact power tool that enhances the strength of the clutch sleeve.

[ contents of utility model ]

To prior art's not enough, the utility model aims to provide an increase impact electric tool of separation and reunion cover intensity to improve and strike electric tool life-span.

The utility model provides a technical scheme that prior art problem adopted is: an impact electric tool comprises a machine shell, a motor contained in the machine shell, an impact system and a rotating system driven by the motor, and a functional knob arranged on the machine shell; the rotating system comprises an air cylinder, a reset spring, a clutch sleeve and an output gear, wherein the reset spring, the clutch sleeve and the output gear are sleeved on the air cylinder, the output gear is axially fixed at the rear end of the air cylinder and rotates relative to the air cylinder, the reset spring pushes the clutch sleeve backwards to be meshed with the output gear, and an inner ring of the clutch sleeve is clamped on the air cylinder and rotates together; the function knob extends into the shell and drives the clutch sleeve to move and position along the axial direction of the cylinder; the impact system comprises a piston arranged at the rear end in the cylinder in a sliding manner and a hammer located in front of the piston, the piston and the hammer are arranged at intervals and jointly enclose a cavity with the cylinder, the cylinder is provided with a ventilating hole penetrating from the periphery to the cavity, and the inner ring of the clutch sleeve covers the ventilating hole; the clutch sleeve is provided with a plurality of air holes which are axially arranged and penetrate from the outer periphery to the inner periphery, and after the clutch sleeve is driven and positioned by the function knob, one of the air holes is relatively communicated with the air hole.

The further improvement scheme is as follows: the function knob can drive the clutch sleeve to move to and be positioned at three positions, and the clutch sleeve is provided with three air holes at intervals along the axial direction.

The further improvement scheme is as follows: and the inner ring of the clutch sleeve is clamped with the outer ring of the cylinder through a key groove.

The further improvement scheme is as follows: the cylinder is provided with a plurality of convex ribs forming a key groove, the ventilating hole penetrates through one of the convex ribs, the clutch sleeve is provided with a plurality of grooves clamped with the convex ribs, and the ventilating hole penetrates through the grooves.

The further improvement scheme is as follows: the cylinder is provided with six convex ribs forming a key groove, the clutch sleeve is provided with six grooves clamped with the six convex ribs, and six air holes are uniformly distributed in the six grooves of the clutch sleeve in the cross section perpendicular to the axis of the cylinder and passing through the ventilating holes.

The further improvement scheme is as follows: the output gear is provided with a transmission gear which protrudes forwards along the cylinder, a gap is formed between the transmission gear and the cylinder, and the rear end of the clutch sleeve is provided with a gear shaping which is inserted into the gap and is in meshed connection with the output gear.

The further improvement scheme is as follows: the air holes are positioned in front of the gear shaping.

The further improvement scheme is as follows: the rotating system also comprises a locking ring connected with the inner wall of the shell through a key groove, a clamping ring clamped on the inner wall of the shell, and a locking spring for pushing the locking ring back against the clamping ring; the periphery of the front end of the clutch sleeve is provided with a latch which is clamped with the locking ring.

The further improvement scheme is as follows: the piston drives the hammer to reciprocate, and the vent hole is at least partially blocked by the stroke of the hammer.

The further improvement scheme is as follows: the transfer ports have a first diameter at the outer periphery of the cylinder and a second diameter at the inner periphery of the cylinder, the first diameter being greater than the second diameter.

Compared with the prior art, the utility model discloses following beneficial effect has: the clutch sleeve is provided with the air holes opposite to the air holes of the air cylinder, and the inner ring of the clutch sleeve is prevented from being grooved for air exchange of the air holes in a punching mode, so that the strength of the clutch sleeve is improved, the thickness of the clutch sleeve can be reduced, the service life of the impact electric tool is prolonged, and the weight of the whole machine is reduced. In addition, six air holes are respectively formed in the cross sections, perpendicular to the axial direction, of the clutch sleeve, eighteen air holes are formed in the clutch sleeve in an accumulated and uniformly distributed mode, so that when the clutch sleeve is installed, the air holes do not need to be aligned with the ventilation holes in an aligned mode, installation is convenient and fast, and the phenomenon of installation dislocation is avoided.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

FIG. 1 is a front view of a preferred embodiment of the present invention of an impact power tool;

FIG. 2 is a cross-sectional view of the impact power tool shown in FIG. 1;

FIG. 3 is a partial perspective view of the impact power tool of FIG. 1;

FIG. 4 is an exploded perspective view of FIG. 1;

FIG. 5 is a perspective view of the cylinder and clutch collar of the present embodiment;

FIG. 6 is a perspective view of the clutch sleeve of FIG. 5;

fig. 7 is an enlarged sectional view taken along the direction a shown in fig. 5.

[ detailed description of the invention ]

Fig. 1 to 7 show an impact power tool 100 according to the present invention, specifically an electric hammer for drilling holes in decoration and building. The electric hammer comprises a main body 1, a handle 2 connected to the main body 1, and a vibration damping assembly 3 located between the main body and the handle 2, wherein the main body 1 comprises a housing 5, a function knob 6 mounted on the housing 5, a chisel head mounted at the front end of the housing 5, a motor 4 accommodated in the housing 5, and an impact system 10 and a rotation system 20 driven by the motor 4, when the electric impact tool 100 works, the function knob 6 is adjusted to interrupt or lock the rotation output of the rotation system 20, and the impact system 10 and the rotation system 20 jointly drive the chisel head to perform impact output or impact rotation output.

Referring to fig. 2 and fig. 5 to fig. 7, the motor 4 is supported in the housing 5 along a direction perpendicular to the output direction of the impact power tool 100 and has a motor tooth 41 extending upward, the main body 1 further includes a rotation input tooth 55 engaged with the front of the motor tooth 41, a rotation output shaft 54 fixed to the inner ring of the rotation input tooth 55, an impact tooth 56 engaged with the rear of the motor tooth 41, and an eccentric shaft 57 fixed to the inner ring of the motor tooth 45, the upper end of the rotation output shaft 54 is engaged with the rotation system 20, and the upper end of the eccentric shaft 57 is provided with an eccentric pin connected to the impact system 10.

The rotating system 20 includes a locking ring 25 connected to the inner wall of the housing 5 through a key slot, a retainer ring 26 clamped to the inner wall of the housing 5, a locking spring 27 for pressing the locking ring 25 backward against the retainer ring 26, the cylinder 21, a return spring 22 sleeved on the cylinder 21, a clutch sleeve 23, an output gear 24, and a support bearing (not numbered) sleeved on the front end of the cylinder 21. The cylinder 21 is supported in the housing 5 in the front-rear direction, the output gear 24 is axially fixed to the rear end of the cylinder 21 and is rotatable relative to the cylinder 21, the output gear 24 has a transmission tooth projecting toward the front along the cylinder 21 and meshing with the rotary output shaft 54; a gap is formed between the transmission gear and the cylinder 21, and the rear end of the clutch sleeve 23 is provided with gear shaping which is inserted into the gap and is meshed with the output gear 24, so that the space is saved, and the miniaturization of the impact electric tool is facilitated; the periphery of the front end of the clutch sleeve 23 is provided with a latch which is clamped with the locking ring 25; the inner ring of the clutch sleeve 23 is clamped on the periphery of the cylinder 21 through a key groove and rotates together; the return spring 22 presses the clutch sleeve 23 backwards to be meshed with the output gear 24, and the output gear 24 drives the clutch sleeve 23 to rotate together.

The impact system 10 comprises a piston 11 arranged at the rear end in the cylinder 21 in a sliding manner and a hammer 12 positioned in front of the piston 11, wherein the piston 11 and the hammer 12 are arranged at intervals and together with the cylinder 21, a cavity is defined, the cylinder 21 is provided with a ventilation hole 211 penetrating from the periphery to the cavity, the piston 11 drives the hammer 12 to reciprocate, and the ventilation hole 211 is at least partially blocked by the stroke of the hammer 12; the cylinder 21 has six ribs forming a key groove, the transfer port 211 penetrates one of the ribs, and the transfer port 211 has a first diameter at the outer periphery of the cylinder 21 and a second diameter at the inner periphery of the cylinder 21, and the first diameter is larger than the second diameter, so that external air can enter the cavity conveniently.

The clutch sleeve 23 is provided with six grooves clamped with six convex ribs, the inner ring of the clutch sleeve 23 covers the ventilating holes 211, the clutch sleeve 23 is provided with a plurality of ventilating holes 231 which are distributed at intervals along the axis and penetrate from the outer periphery to the inner periphery, in the embodiment, three ventilating holes 231 are arranged at intervals, and further the ventilating holes 231 are positioned in front of the gear shaping and penetrate through the grooves, namely, three ventilating holes 231 are arranged at intervals in the single groove; after the clutch sleeve 23 is positioned, one of the plurality of air holes 231 is communicated with the ventilating hole 211 to prevent the ventilating hole 211 from being blocked. In a cross section perpendicular to the axis of the cylinder 21 and passing through the ventilation holes 211, six ventilation holes 231 are uniformly distributed in six grooves of the clutch sleeve 23, that is, eighteen ventilation holes 231 are cumulatively arranged on the clutch sleeve 23 in three cross sections corresponding to the three ventilation holes 231 arranged at intervals, and three ventilation holes 231 arranged at intervals are arranged in each groove of the clutch sleeve 23, so that the grooves without ventilation holes 231 can be prevented from covering the ventilation holes 231, and alignment is not required during installation.

The function knob 6 extends into the shell 5 to extend and drives the clutch sleeve 23 to move and position along the axial direction of the cylinder 21, the latch protrudes outwards and forms a step part, and the function knob 6 is pressed against the step part and can push the clutch sleeve 23 to move forwards; the function knob 6 can drive the clutch sleeve 23 to move to and be positioned at three positions in which the ventilation holes 211 correspond to different ventilation holes 231 in sequence, so that the impact power tool 100 has three modes, i.e., an impact mode, an impact rotation mode and an impact rotation locking mode.

In the impact rotation mode, the gear shaping of the clutch sleeve 23 is engaged with the output gear 24, the clutch sleeve 23 drives the cylinder 21 to rotate together, the cylinder 21 drives the chisel head to rotate and output, and the impact system 10 simultaneously drives the chisel head to impact.

In the impact mode, the function knob 6 drives the clutch sleeve 23 to move forwards, the clutch sleeve 23 is in meshed connection with the output gear 24 to be interrupted, the chisel head is driven to impact and output only by the impact system 10, and the chisel head can rotate freely.

In the impact rotation locking mode, the function knob 6 continues to drive the clutch sleeve 23 to move forward, the clutch sleeve 23 is disconnected from the output gear 24 in a meshing manner, the latch in front of the clutch sleeve 23 is clamped with the locking ring 25, the clutch sleeve 23 cannot rotate, the chisel head is driven by the impact system 10 to impact and output, and the air cylinder 21 and the chisel head cannot rotate freely.

The air holes opposite to the ventilating holes 211 of the air cylinder 21 are formed in the clutch sleeve 23 in the embodiment, and the inner ring of the clutch sleeve 23 is prevented from being grooved in a punching mode so that the ventilating holes 211 can be ventilated, so that the strength of the clutch sleeve 23 is improved, the thickness of the clutch sleeve 23 can be reduced, the service life of the impact electric tool 100 is prolonged, and the weight of the whole machine is reduced. In addition, six air holes 231 are respectively formed in the cross section of the three perpendicular to the axial direction of the clutch sleeve 23, eighteen air holes 231 which are uniformly distributed are accumulated, so that the air holes 231 are not required to be aligned with the air holes 211 when the clutch sleeve 23 is installed, the installation is convenient, and the installation dislocation phenomenon is avoided.

Referring to fig. 1, 3 and 4, one end of the handle 2 is pivotally connected to the main body 1, and the other end is connected to the rear end surface of the main body 1 through the damping assembly 3. The main body 1 is provided with a connecting arm 53 extending from the lower part of the rear end toward the handle 2, the connecting arm 53 is provided with a through hole 531 transversely penetrating through the connecting arm 53, the handle 2 is provided with a left handle 51 and a right handle 52 which are mutually covered and installed, the left handle 51 is provided with a pivot pin (not shown) extending toward the right handle 52 and penetrating through the through hole 531, and the right handle 52 is provided with a holding groove 521 at least partially accommodating the pivot pin.

The vibration damping assembly 3 comprises a first vibration damping part 31 positioned between the rear end surface of the main body and the handle 2 and a second vibration damping part 32 positioned between the main body 1 and the first vibration damping part 31, wherein the first vibration damping part 31 and the second vibration damping part 32 are arranged perpendicular to each other.

The first vibration damping portion 31 includes a pair of bolts 311 extending into the handle 2 from the rear end surface of the main body 1, a connecting plate 312 fixed in the handle, and a first spring 313, a first damping element 314, a second damping element 315, and a baffle 316 slidably fitted over the bolts 311. The main body 1 is provided with a pair of screw seats which are located at the upper end of the rear end face and protrude toward the handle 2, and the screw seats are fixedly connected with the bolts 311. The left end of the first spring 313 presses against the baffle, and the second damping element 315 presses against the rear end surface of the main body 1 through the baffle 316, that is, the left end of the first spring 313 indirectly presses against the rear end surface of the main body 1. The first damping element 314 is located between the head of the bolt 311 and the connecting plate 312, and the right side of the first spring 313 presses the connecting plate 312 and presses the connecting plate 312 against the head of the bolt 311. The left handle 51 and the right handle 52 are both provided with a half-moon groove for the connection plate 312 to be inserted, and the half-moon grooves form a clamping groove 522 for clamping the connection plate 312 together after the left handle 51 and the right handle 52 are covered and installed. In this embodiment, the first spring 313 is used for damping the vibration transmitted from the main body to the handle 2, and the first damping element 314 and the second damping element 315 are both rubber gaskets, so as to further damp the vibration transmitted from the main body 1 to the handle 2.

The second vibration damping portion 32 includes a pair of short bolts 321 extending backward from the rear end surface of the main body 1, a pressing plate 322 slidably sleeved on the short bolts 321, a third damping element 324, and a second spring 323. The main body 1 is provided with another pair of threaded seats which are located at the upper end of the rear end face and protrude towards the handle 2, and the other pair of threaded seats is fixedly connected with the short bolt 321. The pressing plate 322 is located between the rear end surface of the main body 1 and the connecting plate 312, the third damping element 324 is located between the head of the short bolt 321 and the pressing plate 322, the left end of the second spring 323 abuts against the rear end surface of the main body, and the other end of the second spring 323 abuts against the third damping element 324 against the head of the short bolt 321 through the pressing plate 322. The connection plane of the short bolt 321 in this embodiment is perpendicular to the connection plane of the pair of bolts 311, and the connection line of one pair of screw bases intersects with the connection line of the other pair of screw bases and is perpendicular to each other, so that the second vibration damping portion 32 is more compactly arranged inside the impact power tool 100.

The vibration damping assembly 3 in this embodiment includes a first vibration damping portion 32 and a second vibration damping portion 32, the first vibration damping portion 32 primarily dampens the vibration transmitted from the main body 1 to the handle 2 through a first spring 313, when the vibration is too large, the connecting plate 312 on the first vibration damping portion 32 moves forward and pushes the pressing plate 322 of the second vibration damping portion 32 to move forward, the pressing plate 322 compresses the second spring 323 forward to damp the vibration again, and the vibration transmitted from the main body 1 to the handle 2 is greatly damped through a secondary vibration damping mode. In addition, the first damping element 314, the second damping element 315 and the third damping element 324 which are respectively arranged in the first vibration damping part 32 and the second vibration damping part 32 are all rubber gaskets, so that the vibration transmitted from the main body 1 to the handle 2 is further weakened.

Claims

1. An impact electric tool comprises a machine shell, a motor contained in the machine shell, an impact system and a rotation system which are driven by the motor, and a functional knob arranged on the machine shell; the rotating system comprises an air cylinder, a reset spring, a clutch sleeve and an output gear, wherein the reset spring, the clutch sleeve and the output gear are sleeved on the air cylinder, the output gear is axially fixed at the rear end of the air cylinder and rotates relative to the air cylinder, the reset spring pushes the clutch sleeve backwards to be meshed with the output gear, and an inner ring of the clutch sleeve is clamped on the air cylinder and rotates together; the function knob extends into the shell and drives the clutch sleeve to move and position along the axial direction of the cylinder; the impact system comprises a piston arranged at the rear end in the cylinder in a sliding manner and a hammer located in front of the piston, the piston and the hammer are arranged at intervals and surround a cavity together with the cylinder, the cylinder is provided with a ventilating hole penetrating from the periphery to the cavity, and the inner ring of the clutch sleeve covers the ventilating hole; the method is characterized in that: the clutch sleeve is provided with a plurality of air holes which are axially arranged and penetrate from the outer periphery to the inner periphery, and after the clutch sleeve is driven and positioned by the function knob, one of the air holes is relatively communicated with the air hole.

2. The impact power tool of claim 1, wherein: the function knob can drive the clutch sleeve to move to and be positioned at three positions, and the clutch sleeve is provided with three air holes at intervals along the axial direction.

3. The impact power tool of claim 1, wherein: and the inner ring of the clutch sleeve is clamped with the outer ring of the cylinder through a key groove.

4. The impact power tool of claim 3, wherein: the cylinder is provided with a plurality of convex ribs forming a key groove, the ventilating hole penetrates through one of the convex ribs, the clutch sleeve is provided with a plurality of grooves clamped with the convex ribs, and the ventilating hole penetrates through the grooves.

5. The impact power tool of claim 4, wherein: the cylinder is provided with six convex ribs forming a key groove, the clutch sleeve is provided with six grooves clamped with the six convex ribs, and six air holes are uniformly distributed in the six grooves of the clutch sleeve in the cross section perpendicular to the axis of the cylinder and passing through the ventilating holes.

6. The impact power tool of claim 1, wherein: the output gear is provided with a transmission gear which protrudes forwards along the cylinder, a gap is formed between the transmission gear and the cylinder, and the rear end of the clutch sleeve is provided with a gear shaping which is inserted into the gap and is in meshed connection with the output gear.

7. The impact power tool of claim 6, wherein: the air holes are positioned in front of the gear shaping.

8. The impact power tool of claim 1, wherein: the rotating system also comprises a locking ring connected with the inner wall of the shell through a key groove, a clamping ring clamped on the inner wall of the shell, and a locking spring for pushing the locking ring back against the clamping ring; the periphery of the front end of the clutch sleeve is provided with a latch which is clamped with the locking ring.

9. The impact power tool of claim 1, wherein: the piston drives the ram to do reciprocating motion, and the ventilation hole is at least partially blocked in the stroke of the ram.

10. The impact power tool of claim 1, wherein: the transfer ports have a first diameter at the outer periphery of the cylinder and a second diameter at the inner periphery of the cylinder, the first diameter being larger than the second diameter.