CN108340322A - Power tool - Google Patents
Power tool Download PDFInfo
- Publication number
- CN108340322A CN108340322A CN201710056969.4A CN201710056969A CN108340322A CN 108340322 A CN108340322 A CN 108340322A CN 201710056969 A CN201710056969 A CN 201710056969A CN 108340322 A CN108340322 A CN 108340322A
- Authority
- CN
- China
- Prior art keywords
- impact
- clutch
- driving
- power tool
- driven
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001360 synchronised effect Effects 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims description 6
- 230000003116 impacting effect Effects 0.000 claims description 2
- 238000009527 percussion Methods 0.000 abstract description 6
- 239000007769 metal material Substances 0.000 description 5
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F3/00—Associations of tools for different working operations with one portable power-drive means; Adapters therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
The invention discloses a kind of power tool, especially a kind of electric impact wrench comprising：Motor, output shaft, percussion mechanism, clutch and shell, output shaft is used for output torque, for percussion mechanism for driving output shaft, clutch to be used to the power of motor being sent to percussion mechanism in a manner of impact, shell forms the accommodating chamber for accommodating motor and clutch；Wherein, clutch includes：Driving link and driven member, driving link can be driven by a motor around a center axis thereof, and driven member is contacted with driving link and can be rotated synchronously with driving link, and driven member disengages the synchronous rotation with driving link when percussion mechanism impacts；Driving link or driven member are at least made of the material comprising metallic element.Wherein, the wearability of driving link is good, so as to extend the service life of power tool.
Description
Technical Field
The invention relates to a power tool, in particular to an electric impact wrench.
Background
Electric impact wrenches are widely appreciated by users as a power tool for outputting torque. The conventional electric impact wrench has a small energy storage and a low single-strike torque, and for this reason, a centrifugal impact wrench has also appeared. The torque of a single strike of a centrifugal impact wrench is much higher than that of a conventional electric impact wrench. However, the clutch in the existing centrifugal impact wrench is usually rubbed by rubber to achieve the clutch function, and the high temperature of the rubber during rubbing causes the rubber to wear relatively quickly and have poor stability.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a power tool capable of prolonging the service life.
In order to achieve the above object, the present invention adopts the following technical solutions:
a power tool, comprising: the motor comprises a motor, an output shaft, an impact device, a clutch and a shell, wherein the output shaft is used for outputting torque, the impact device is used for driving the output shaft in an impact mode, the clutch is used for transmitting the power of the motor to the impact device, and the shell forms a containing cavity for containing the motor and the clutch; wherein, the clutch includes: the driving part can be driven by the motor to rotate around a central axis, the driven part is in contact with the driving part and can synchronously rotate along with the driving part, and the driven part is separated from synchronous rotation along with the driving part when the impact device impacts; the driving member or the driven member is made of at least a material containing a metal element.
Further, the clutch further includes: and a biasing member for biasing the driven member into contact with the driving member.
Further, the clutch further includes: a bracket for mounting the driven member; the follower is connected to the carrier and rotates synchronously with the carrier about the central axis.
Further, the clutch further includes: a drive shaft for driving the percussion device; the carrier is coupled to the drive shaft for synchronous rotation of the drive shaft with the carrier about the central axis.
Further, the stand includes: a shaft connecting part formed with a shaft hole for inserting the driving shaft and a disc part for supporting the driven part; the follower is disposed on one side of the disk portion and the biasing element is disposed on the other side of the disk portion and is in contact with the disk portion.
Alternatively, the power tool further comprises: a clutch housing for at least receiving the driven member; the biasing element is supported between the carrier and the clutch housing; the drive shaft passes through the clutch housing.
Alternatively, the power tool further comprises: a clutch housing for at least receiving the driven member; a drive shaft bearing capable of rotatably supporting the drive shaft is provided between the drive shaft and the clutch housing.
Alternatively, the power tool further comprises: a clutch housing for accommodating at least a portion of the driving member; the driving part includes: an input portion extending in a direction parallel to the central axis and a contact portion extending in a radial direction of the central axis; the contact portion is provided between the motor and the driven member.
Further, a support member capable of rotatably supporting the contact portion in a direction parallel to the center axis is provided between the contact portion and the clutch housing.
Further, the power tool further comprises a clutch housing, and the clutch housing forms an accommodating space at least used for accommodating the driven member, wherein the accommodating space is closed relative to the accommodating cavity.
An electric impact wrench, comprising: the motor comprises a motor, an output shaft, an impact device, a clutch and a shell, wherein the output shaft is used for outputting torque, the impact device is used for driving the output shaft in an impact mode, the clutch is used for transmitting the power of the motor to the impact device, and the shell is used for accommodating the motor and the clutch; wherein, the clutch includes: the impact device comprises a driving part, a driven part and a first biasing element, wherein the driving part can be driven by a motor to rotate around a central axis, the driven part is in contact with the driving part and can synchronously rotate along with the driving part, the driven part is separated from synchronous rotation along with the driving part when the impact device impacts, and the first biasing element is used for biasing the driven part to be in contact with the driving part; the driving member or the driven member is made of at least a material containing a metal element; the impact device includes: the impact seat can synchronously rotate along with the driven piece, the impact piece is used for impacting an output shaft when the rotating speed of the impact seat reaches a preset value, the impact piece is rotatably connected to the impact seat, the rotating axis of the impact piece is parallel to the central axis, the locking piece is installed on the impact seat, the locking piece has a locking position for locking the impact piece to rotate relative to the impact seat and a releasing position for releasing the impact piece to rotate relative to the impact seat, and the second biasing element is used for biasing the locking piece to the locking position.
The invention has the advantages that: the driving part in the power tool has good wear resistance, so that the service life of the power tool can be prolonged.
Drawings
Fig. 1 is a perspective view of a power tool as an embodiment;
FIG. 2 is an inside view of the power tool of FIG. 1 with a portion of the housing removed;
FIG. 3 is a perspective view of the impact device of FIG. 2;
FIG. 4 is a cross-sectional view of the structure shown in FIG. 3;
FIG. 5 is an exploded view of the structure shown in FIG. 3;
FIG. 6 is a perspective view of the output member and clutch of FIG. 2;
FIG. 7 is another angled perspective view of the output member and clutch of FIG. 2;
FIG. 8 is a cross-sectional view of the structure shown in FIG. 6;
fig. 9 is an exploded view of the structure shown in fig. 6.
Detailed Description
The power tool 100 shown in fig. 1 is used for outputting torque, and may be embodied as an electric impact wrench. As shown in fig. 1 and 2, the power tool 100 includes: housing 11, motor 12, output shaft 13, impact device 14, and clutch 20.
The housing 11 forms a housing chamber 111 capable of housing at least the motor 12, the impact device 14, and the clutch 20, and the output shaft 13 protrudes out of the housing 11 to output torque. A motor 12, which may be embodied as an electric motor, is disposed within the housing 11. The impact device 14 is used for driving the output shaft 13 to output torque in an impact manner. For an electric impact wrench, the power tool 100 may further comprise a battery pack 15 and a gear box 16, wherein the battery pack 15 is detachably connected to the housing 11, and the battery pack 15 is used for supplying electric power to the motor. A gearbox 16 is provided between the motor 12 and the impact device 14 for reducing the rotational speed of the motor 12 output to the impact device 14. In addition, in the case of the electric impact wrench, the power tool 100 further includes a reinforcing sleeve 17 provided at an end portion of the housing 11, so that damage to the housing 11 after long-term operation of the power tool 100 can be prevented.
As shown in fig. 2 to 4, the impact device 14 may include: an impact seat 141, an impact block 142, a locking member 143, and a second biasing member 144. The impact base 141 can be driven by the motor 12 to rotate around the central axis 101, the impact block 142 is rotatably mounted to the impact base 141, the locking member 143 is movably mounted to the impact base 141, the locking member 143 has a locking position for locking the impact block 142 to the impact base 141 and a releasing position for releasing the impact block 142 from rotating relative to the impact base 141, and the second biasing member 144 is used for biasing the locking member 143 to the locking position. When the rotation speed of the impact base 141 is less than a preset value, the second biasing element 144 biases the locking member 143 to the locking position, and at this time, the locking member 143 locks the impact block 142 to rotate relative to the impact base 141, so that the impact block 142 cannot impact the output shaft 13 at this time; when the rotation speed of the impact seat 141 reaches the preset value, the locking member 143 moves to the release position against the bias of the second biasing element 144, and at this time, the locking member 143 releases the rotation of the impact block 142 relative to the impact seat 141, so that the impact block 142 can impact the output torque of the output shaft 13 at this time.
Specifically, the number of the impact blocks 142 is 2, two impact blocks 142 are symmetrically disposed on the impact base 141, and each impact block 142 is rotatably mounted to the impact base 141 by a pivot pin 145. The rotation axis of the impact block 142 rotating relative to the impact base 141 is also parallel to the central axis 101 of the impact base 141. The locking member 143 may be embodied as a ball, the second biasing member 144 is a coil spring, and the striking seat 141 is provided with a receiving groove 141a for receiving the coil spring, and the ball is also partially received in the receiving groove 141 a. A groove 142a for enabling the ball to be partially inserted is provided at a position of the impact block 142 corresponding to the receiving groove 141 a.
It is known that when the impact block 142 impacts the output shaft 13, the impact seat 141 is also subjected to the reaction force of the impact block 142, which if transmitted in reverse to the motor 12, would seriously affect the life of the motor 12 and would also affect the use of the user. Therefore, as shown in fig. 2 and 6 to 9, the above-described clutch 20 is provided between the motor 12 and the impact device 14, and the torque of the motor 12 is transmitted to the impact device 14 through the clutch 20, and the reaction force of the impact socket 141 can be prevented from being transmitted to the motor 12 in the reverse direction.
The clutch 20 includes: the clutch housing 21, the driving member 22, the driven member 23, the first biasing member 24, the bracket 25 and the driving shaft 26, wherein the driving member 22, the driven member 23, the first biasing member 24 and the bracket 25 are disposed in the clutch housing 21, the driving shaft 26 is partially disposed in the clutch housing 21, and the driving shaft 26 further passes through the clutch housing 21 and protrudes out of the clutch housing 21.
The driving member 22 can be driven by the motor 12 to rotate about the central axis 101, and the driven member 23 is in contact with the driving member 22 and rotates synchronously with the driving member 22 when the impact device 14 is not impacted, while the driven member 23 can be disengaged from the synchronous rotation with the driving member 22 when the impact device 14 is impacted. The first biasing member 24 can generate a biasing force that brings the driven member 23 into contact with the driving member 22 to generate a frictional force. The bracket 25 is used for mounting the follower 23, and the follower 23 is connected to the bracket 25 and can rotate around the central axis 101 together with the bracket 25. The drive shaft 26 is used for power take-off to drive the percussion device 14, the drive shaft 26 also constituting a synchronous rotation with the bracket 25 about the central axis 101. Note that, when the driven member 23 is rotated synchronously with the driving member 22, the driven member 23 is able to rotate relative to the driving member 22, and the driven member 23 is not changed in position in the direction of the central axis 101 and is out of contact with the driving member 22, and in fact, the position of the driven member 23 in the direction of the central axis 101 is not changed. Of course, those skilled in the art will understand that the matching relationship between the driven member 23 and the driving member 22 is not limited thereto. For example, the driven member 23 may be shifted in position in the direction of the central axis 101 to achieve the purpose of releasing the synchronous rotation with the driving member 22, which also falls within the protection scope of the present invention.
Thus, when the impact device 14 has not been impacted after the power tool 100 is started, the first biasing member 24 biases the driven member 23 into contact with the driving member 22, and the driving member 22 drives the driven member 23 to rotate by the friction force between the driving member 22 and the driven member 23, so that the driven member 23, the bracket 25, and the driving shaft 26 can rotate synchronously with the driving member 22, and the driving shaft 26 can output the torque to the impact device 14. When the impact device 14 impacts, the impact seat 141 receives a reaction force, and the driven part 23 is separated from the synchronous rotation of the driving part 22, so that the motor 12 is prevented from being influenced by the reaction force of the impact seat 141, and the service life of the motor 12 can be prolonged.
One of the driving member 22 and the driven member 23 may be made of a material containing a metal element. Further, the driving member 22 is made of a metal material, and the driven member 23 is mainly made of a non-metal material. The driving part 22 is made of 40Cr steel, so that the abrasion speed of the driving part 22 can be reduced, the service life is long, the stability is good, and the driven part 23 can be a friction plate which can be made of a non-metal material serving as a base body and a small amount of metal powder added into the base body.
Specifically, the driving member 22 can be driven by the gear box 16 disposed between the motor 12 and the clutch 20. The gear box 16 includes an output member 161 for outputting a torque force, and the output member 161 may be a carrier. The driving member 22 includes: an input portion 221 and a contact portion 222, the input portion 221 extending generally in a direction parallel to the central axis 101, the input portion 221 for mating with the output member 161. The output member 161 includes an output portion 161a extending along the central axis 101, and the input portion 221 is fitted over the output portion 161a, so that torque can be transmitted therebetween by way of a flat fit. It is understood that the matching manner of the output portion 161a and the input portion 221 is not limited thereto, and the output portion 161a can transmit the torque to the output portion 161 a. The contact portion 222 extends substantially in a radial direction of the central axis 101, the contact portion 222 is for contact with the driven member 23, and the contact portion 222 is also located between the motor 12 and the driven member 23.
. The bracket 25 includes: a connecting shaft part 251 and a disk part 252, wherein the connecting shaft part 251 is arranged at one side of the disk part 252 far away from the driving part 22. The shaft connecting portion 251 is used to connect the bracket 25 to the drive shaft 26, and the shaft connecting portion 251 is further formed with a shaft hole 251a into which the drive shaft 26 is inserted. The connecting shaft portion 251 and the drive shaft 26 may be configured to rotate synchronously by a flat engagement. The disc portion 252 is used for supporting the driven member 23, and the driven member 23 is fixedly connected with the disc portion 252. The follower 23 is disposed on a side of the disk portion 252 away from the shaft portion 251, and the follower 23 is disposed between the disk portion 252 and the driving member 22. The bracket 25 may be made of a metal material, so that the bracket 25 has high toughness, and as described above, the driven member 23 is mainly made of a non-metal material, so that the wear resistance is high.
The clutch housing 21 includes a left housing 211 and a right housing 212, and the left housing 211 and the right housing 212 are fixedly connected by screws, wherein the left housing 211 is disposed between the motor 12 and the right housing 212. The left housing 211 and the right housing 212 are combined to form an accommodating space 213, and the accommodating space 213 is substantially closed with respect to the accommodating cavity 111 of the housing 11 located outside the clutch housing 21, so that dust generated by friction between the driving member 22 and the driven member 23 can be prevented from flying out of the accommodating cavity 111. In addition, the housing 11 is also formed with an opening 112 at a position corresponding to the clutch 20, thereby facilitating heat dissipation to the clutch 20.
The right housing 212 includes a first accommodating portion 212a accommodating at least the follower 23 and an annular groove 212b extending from the first accommodating portion 212a toward the impact device 14, the first accommodating portion 212a further communicates with the annular groove 212b, and the bracket 25 is disposed in the first accommodating portion 212 a. The first biasing element 24 is supported between the carrier 25 and the clutch housing 21, and specifically, the first biasing element 24 is a coil spring disposed within the annular groove 212b, the coil spring being supported between the carrier 25 and the groove bottom of the annular groove 212 b. The inner wall of the annular groove 212b surrounds a center hole 212c formed through the clutch housing 21 in the direction of the center axis 101, and the drive shaft 26 passes through the center hole 212 c. The clutch 20 further includes a drive shaft bearing 27 disposed between the drive shaft 26 and the clutch housing 21 to rotatably support the drive shaft 26. The drive shaft bearing 27 is provided at the center hole 212c and is fitted over a portion of the drive shaft 26 located within the center hole 212 c.
The clutch 20 further includes a support 28 disposed between the contact portion 222 and the clutch housing 21, the support 28 rotatably supporting the contact portion 222 in a direction parallel to the center axis 101. Specifically, the left housing 211 is formed with a receiving groove 211a opened toward the contact portion 222, and the support 28 is a ball disposed in the receiving groove 211 a. An input bearing 29 for rotatably supporting the input unit 221 is further provided between the input unit 221 and the left housing 211, and the input bearing 29 is fitted around the outer periphery of the input unit 221.
In this way, the driving member 22, the driven member 23, the bracket 25, the first biasing member 24, and the driving shaft 26 can be assembled into the clutch housing 21, thereby making assembly more convenient and enabling assembly tolerances to be reduced.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (11)
1. A power tool, comprising:
a motor;
an output shaft for outputting torque;
an impact device for driving the output shaft in an impact manner;
a clutch for transmitting power of the motor to the impact device;
a housing forming a receiving chamber for receiving the motor and the clutch;
wherein the clutch includes:
the driving part can be driven by the motor to rotate around a central axis;
the driven part is contacted with the driving part and can synchronously rotate along with the driving part, and the driven part is separated from synchronous rotation along with the driving part when the impact device impacts;
the driving member or the driven member is made of at least a material containing a metal element.
2. The power tool of claim 1, wherein:
the clutch further includes:
a biasing element for biasing the driven member into contact with the driving member.
3. The power tool of claim 2, wherein:
the clutch further includes:
a bracket for mounting the driven member;
the follower is connected to the carrier and rotates synchronously with the carrier about the central axis.
4. The power tool of claim 3, wherein:
the clutch further includes:
a drive shaft for driving the impact device;
the carrier is coupled to the drive shaft for synchronous rotation of the drive shaft with the carrier about the central axis.
5. The power tool of claim 4, wherein:
the bracket includes:
a shaft connecting part, which is provided with a shaft hole for inserting the driving shaft;
a disc portion for supporting the follower;
the follower is disposed on one side of the disk portion and the biasing element is disposed on the other side of the disk portion and is in contact with the disk portion.
6. The power tool of claim 4, wherein:
the power tool further includes:
a clutch housing for accommodating at least the driven member;
the biasing element is supported between the carrier and the clutch housing; the drive shaft passes through the clutch housing.
7. The power tool of claim 4, wherein:
the power tool further includes:
a clutch housing for accommodating at least the driven member;
and a driving shaft bearing capable of rotatably supporting the driving shaft is arranged between the driving shaft and the clutch shell.
8. The power tool of claim 1, wherein:
the power tool further includes:
a clutch housing for receiving at least a portion of the driving member;
the driving member includes:
an input portion extending in a direction parallel to the central axis;
a contact portion extending in a radial direction of the central axis;
the contact portion is provided between the motor and the follower.
9. The power tool of claim 8, wherein:
a support member capable of rotatably supporting the contact portion in a direction parallel to the center axis is provided between the contact portion and the clutch housing.
10. The power tool of claim 1, wherein:
the power tool further includes:
a clutch housing forming an accommodating space for accommodating at least the driven member;
wherein the accommodating space is closed relative to the accommodating cavity.
11. An electric impact wrench, comprising:
a motor;
an output shaft for outputting torque;
an impact device for driving the output shaft in an impact manner;
a clutch for transmitting power of the motor to the impact device;
a housing for housing the motor and the clutch;
wherein,
the clutch includes:
the driving part can be driven by the motor to rotate around a central axis;
the driven part is contacted with the driving part and can synchronously rotate along with the driving part, and the driven part is separated from synchronous rotation along with the driving part when the impact device impacts;
a first biasing member for biasing the driven member into contact with the driving member;
the driving member or the driven member is made of at least a material containing a metal element;
the impact device includes:
the impact seat can synchronously rotate along with the driven piece;
the impact block is used for impacting the output shaft when the rotating speed of the impact seat reaches a preset value, the impact block is rotatably connected to the impact seat, and the rotating axis of the impact block is parallel to the central axis;
a locking member mounted to the impact base, the locking member having a locking position to lock rotation of the impact block relative to the impact base and a releasing position to release rotation of the impact block relative to the impact base;
a second biasing member for biasing the locking member to the locked position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710056969.4A CN108340322A (en) | 2017-01-22 | 2017-01-22 | Power tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710056969.4A CN108340322A (en) | 2017-01-22 | 2017-01-22 | Power tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108340322A true CN108340322A (en) | 2018-07-31 |
Family
ID=62961878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710056969.4A Pending CN108340322A (en) | 2017-01-22 | 2017-01-22 | Power tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108340322A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111002262A (en) * | 2018-10-05 | 2020-04-14 | 乔治雷诺公司 | Electric impact wrench with rebound impact mechanism |
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| CN1785602A (en) * | 2004-12-09 | 2006-06-14 | 罗伯特·博世有限公司 | Hand power tool with a clutch |
| US20060135267A1 (en) * | 2002-12-12 | 2006-06-22 | Bosk Brian K | Wedge clutch assembly |
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| CN201209634Y (en) * | 2008-06-05 | 2009-03-18 | 重庆齿轮箱有限责任公司 | Dry-type friction safety clutch |
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| CN104608099A (en) * | 2013-11-04 | 2015-05-13 | 南京德朔实业有限公司 | Electric tool for outputting torque |
-
2017
- 2017-01-22 CN CN201710056969.4A patent/CN108340322A/en active Pending
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| DE3807308A1 (en) * | 1988-03-05 | 1989-09-14 | Licentia Gmbh | Radially acting safety friction clutch of a power tool |
| CN1356192A (en) * | 2000-12-01 | 2002-07-03 | 希尔蒂股份公司 | Hand-held electric tool with safety clutch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111002262A (en) * | 2018-10-05 | 2020-04-14 | 乔治雷诺公司 | Electric impact wrench with rebound impact mechanism |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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