CN218462047U - Electric impact wrench - Google Patents

Abstract

The utility model relates to the technical field of wrenches, in particular to an electric impact wrench, which comprises a gear box, wherein the input end of the gear box is connected with a brushless motor, and the output end of the gear box is connected with an output shaft; the clutch rod is in transmission connection with the output shaft through an impact assembly; the fixed-torque component comprises a clutch sleeve, a torque spring and a positioning sleeve which are sequentially sleeved on the clutch rod, the impact component comprises a boss and an impact ball which are arranged on the end face of the output shaft, a mounting groove is formed in the end face of the clutch sleeve, and the impact ball is partially embedded in the mounting groove and partially protrudes out of the mounting groove and is abutted against the side wall of the boss and the end face of the output shaft. Brushless motor provides power in this application, and power is stable, the security performance is high, guaranteed the speed of screw-up, and when the screw-up, the clutch housing was slided and is impacted compression torque spring in order to realize deciding the turn round along clutch lever axial displacement under the drive of assaulting the subassembly, has ensured operating mass with fixed the turning round.

Description

Electric impact wrench

Technical Field

The application relates to the technical field of wrenches, in particular to an electric impact wrench.

Background

Impact wrench belongs to mechatronic instrument, mainly uses in steel construction installation trade for high strength bolt's fixed impact wrench. The bolt screwing device is widely used for locking or disassembling bolts with large torque, so that the labor is effectively reduced, and the automation level is improved.

Chinese patent with publication number CN210819323U discloses a single-hammer pneumatic impact wrench, wherein a casing is provided with a front cover and a rear cover, the casing is also provided with a trigger and an air inlet joint, the trigger is matched with an opening and closing valve arranged in the casing, a cylinder is arranged in the casing, two ends of the cylinder are correspondingly provided with a front end plate and a rear end plate made of steel, a rotor is arranged in the cylinder, blades are arranged on the rotor, the front end of the rotor is connected with a hammering chamber, a hammering block is arranged in the hammering chamber, and an impact rod is arranged at the center of the hammering block; a reversing rod is arranged between the cylinder and the opening and closing valve, an air inlet and an air outlet are arranged on the reversing rod, and a deflector rod is arranged at the rear end of the reversing rod.

When the impact wrench works, compressed air is connected from the air inlet joint, the trigger is pressed down to open the on-off valve, the compressed air enters the air cylinder through an air outlet passage formed between the air inlet and the air outlet on the reversing rod to push the rotor to rotate, and the rotor drives the impact mechanism consisting of the hammering chamber, the hammering block and the impact rod to work. In the operation process, because the air wrench needs external air supply, the air supply that different operational environment can supply is different, when atmospheric pressure is insufficient, very easily influences the speed and the efficiency that the impact wrench screwed up the screw, finally influences the output rotational speed and the moment of torsion that impact wrench, and the operation quality is poor. In addition, the pneumatic wrench does not have a torque setting function when screwing the screw, is controlled by the experience of an operator, has a certain error value, further increases the working difficulty of the operator when an air source is unstable, and reduces the working quality.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the technical scheme of the application provides an electric impact wrench. The technical scheme is as follows:

the application provides an electric impact wrench, which comprises a gear box, wherein the input end of the gear box is connected with a brushless motor, and the output end of the gear box is connected with an output shaft; the clutch rod is in transmission connection with the output shaft through an impact assembly; the torque fixing assembly comprises a clutch sleeve, a torque spring and a positioning sleeve which are sequentially sleeved on the clutch rod, the torque spring elastically abuts between the clutch sleeve and the positioning sleeve, and when the screw is screwed down, the clutch sleeve moves axially along the clutch rod under the driving of the impact assembly to slip and impact the torque spring to realize torque fixing; the impact assembly comprises a boss arranged on the end face of the output shaft and an impact ball, a mounting groove is formed in the end face of the clutch sleeve, and when the screw is not screwed down, the impact ball is partially embedded in the mounting groove, partially protrudes out of the mounting groove and is abutted to the side wall of the boss and the end face of the output shaft.

Further, the impact assemblies are symmetrically arranged at least two around the center line of the clutch rod.

Specifically, a first sliding groove is formed in the peripheral wall of the clutch rod, a second sliding groove is formed in the inner wall of the clutch sleeve, the first sliding groove and the second sliding groove are both arranged along the axial direction of the clutch rod, the first sliding groove and the second sliding groove are arranged just opposite to each other to form an installation space, a ball is arranged in the installation space, and the ball abuts against the space between the clutch rod and the clutch sleeve.

Particularly, still include the outer casing, brushless motor, gear box and impact subassembly all hold in the outer casing, still be equipped with starting switch on the outer casing to control brushless motor's the opening and closing.

Furthermore, a circuit board electrically connected with the brushless motor is further arranged in the outer casing, and a temperature control switch and a forward and reverse rotation switch are mounted on the circuit board.

Specifically, the one end of outer casing is connected with the regulation shell through clutch housing, it establishes to adjust the shell the clutch housing is last, the position sleeve deviates from one side of torque spring is equipped with the knock pin, the knock pin with the interior diapire butt of adjusting the shell.

Compared with the prior art, the application has the beneficial effects that:

1. the brushless motor provides power, the power is stable, the safety performance is high, meanwhile, the screw tightening speed is ensured, and the operation quality is guaranteed;

2. when the screw is screwed down, the clutch rod stops rotating, the brushless motor continuously provides power, the output shaft overcomes the resistance brought by impact balls, the boss jacks up the clutch sleeve, then the clutch sleeve continuously makes reciprocating axial movement, the torque spring is compressed, the slip impact is realized, and the fixed torque is realized;

3. in the process of screwing the screw, the ball acts between the clutch rod and the clutch sleeve to transmit output power; after the screw is screwed down, when the clutch sleeve is impacted by slipping and continuously moves in an axial reciprocating manner, the balls reduce friction and abrasion between the clutch sleeve and the clutch rod, and the stability of output torque is improved.

Drawings

FIG. 1 is a perspective view of an electric impact wrench according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of an electric impact wrench in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a torque determining assembly embodied in an embodiment of the present application;

FIG. 4 is a schematic structural view of a clutch sleeve embodied in an embodiment of the present application;

fig. 5 is an enlarged view of a portion a in fig. 2.

Reference numerals: 1. an outer housing; 11. starting a switch; 12. adjusting the housing; 13. locking the nut; 14. a circuit board; 15. a temperature control switch; 16. a forward and reverse rotation switch; 2. a brushless motor; 3. a gear case; 31. a planet carrier; 32. a first bearing; 4. an output shaft; 41. a clamp spring; 5. a clutch lever; 51. a compression spring; 52. a second bearing; 53. a first sliding chute; 55. a clutch housing; 6. a torque fixing component; 61. a clutch sleeve; 62. a torque spring; 63. a positioning sleeve; 64. a knock pin; 7. an impact assembly; 71. a boss; 72. impacting a ball; 8. mounting grooves; 9. a second chute; 10. and a ball.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings for convenience in describing the present application and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present application.

In the description of the present application, it is to be noted that the terms "mounted", "connected" and "connected" are to be construed broadly and may for example be fixedly connected, detachably connected or integrally connected, unless expressly stated or limited otherwise. Either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The present application is described in further detail below with reference to fig. 1-3.

As shown in fig. 1 and fig. 2, the present application provides an electric impact wrench, which includes an outer casing 1, a brushless motor 2 accommodated in the outer casing 1, a gear box 3, and an output shaft 4, wherein a start switch 11 is provided on the outer casing 1, and an operator controls the opening and closing of the brushless motor 2 through the start switch 11. The input end of the gear box 3 is connected with the power output end of the brushless motor 2, and the output end of the gear box 3 is coaxially connected with the output shaft 4 through the planet carrier 31 to transmit power.

As shown in fig. 2 and 3, the impact wrench further includes a clutch lever 5 and a torque-fixing assembly 6, the output shaft 4 is coaxially disposed with the clutch lever 5, and the two are in transmission connection through an impact assembly 7. A compression spring 51 is arranged in one end part of the clutch rod 5 and is inserted into the output shaft 4, the compression spring 51 is extruded between the clutch rod 5 and the output shaft 4, vibration generated when the impact assembly 7 impacts the torque fixing assembly 6 in a sliding mode is relieved, and stability of torque output of the impact wrench is improved.

As shown in fig. 2 and 3, the torque fixing assembly 6 includes a clutch sleeve 61, a torque spring 62 and a positioning sleeve 63, which are sequentially sleeved on the clutch rod 5 along a direction away from the gear box 3, wherein the torque spring 62 is elastically abutted between the clutch sleeve 61 and the positioning sleeve 63. In the process of screwing down the screw, the brushless motor 2 transmits torque and power through the output shaft 4 and the impact assembly 7 to drive the clutch rod 5 to rotate. When the screw is tightened, the clutch rod 5 stops rotating, the brushless motor 2 continuously outputs power, the clutch sleeve 61 moves axially along the clutch rod 5 under the driving of the impact assembly 7, and the torque spring 62 is compressed by slipping impact to realize torque setting.

Above-mentioned in-process brushless motor 2 provides power, and power is stable, has guaranteed the speed that the screw was screwed up when the security performance is high, cooperatees with the subassembly 6 of turning round surely, has improved the accuracy of turning round surely, and then has improved the operating quality.

As shown in fig. 2, in order to improve the stability of the impact wrench during operation, a first bearing 32 is provided in the gear housing 3, and the planet carrier 31 is coaxially connected with the first bearing 32. The second bearing 52 is arranged on the clutch rod 5, the second bearing 52 is positioned on one side, away from the gear box 3, of the torque positioning assembly 6, and the second bearing 52 improves guiding for the clutch rod 5, so that the situations of decentration and shaking of the clutch rod 5 during rotation are prevented, and abrasion of the clutch rod 5 is reduced.

In the embodiment, the first bearing 32 and the second bearing 52 both adopt the deep groove ball bearings, the deep groove ball bearings can bear radial load and axial load at the same time, the structure is simple, the use is convenient, the friction coefficient is small, the limit rotating speed is high, and the service life of the impact wrench is effectively prolonged. Furthermore, a clamp spring 41 is arranged inside the output shaft 4, and the clutch rod 5 is limited and bears the axial load.

In the present embodiment, as shown in fig. 3 and 4, at least three striking assemblies 7 are symmetrically arranged around the center line of the clutch lever 5, and one striking assembly 7 will be described as an example. The impact assembly 7 comprises a boss 71 and an impact ball 72, the boss 71 is arranged on the end face, deviating from the gear box 3, of the output shaft 4, the clutch sleeve 61 starts to be provided with an installation groove 8 on the end face, facing the gear box 3, of the impact ball 72, the impact ball 72 is partially embedded in the installation groove 8, part of the impact ball protrudes out of the installation groove 8, and the part of the impact ball 72, protruding out of the installation groove 8, abuts against the side wall of the boss 71. In the process of screwing the screw, the boss 71 and the impact ball 72 are contacted with each other, and under the action of resistance, the output shaft 4 drives the clutch sleeve 61 to transmit power through the impact ball 72.

After the screw is screwed down, the clutch lever 5 stops rotating, the brushless motor 2 continuously provides power, the output shaft 4 overcomes the resistance caused by the three impact balls 72, the boss 71 jacks the clutch sleeve 61 through the impact balls 72, then the clutch sleeve 61 continuously performs reciprocating axial movement, the torque spring 62 is compressed, the sliding impact effect is realized, and therefore fixed torque is realized.

As shown in fig. 4 and 5, the circumferential wall of the clutch rod 5 is provided with a first sliding groove 53 along the axial direction, the inner wall of the clutch sleeve 61 is provided with a second sliding groove 9 along the axial direction, the first sliding groove 53 and the second sliding groove 9 are oppositely arranged to form an installation space, a ball 10 is arranged in one installation space, and the ball 10 abuts against between the clutch rod 5 and the clutch sleeve 61. The three sliding grooves 53 are symmetrically arranged around the central line of the clutch lever 5, and the sliding grooves 53, the sliding grooves 9 and the balls 10 are arranged in a one-to-one correspondence manner.

During the screwing process, the balls 10 act between the clutch lever 5 and the clutch sleeve 61 to transmit the output power. After the screw is tightened, when the clutch sleeve 61 is subjected to slip impact and continuously and axially reciprocates, the ball 10 reduces friction and abrasion between the clutch sleeve 61 and the clutch rod 5, and improves the stability of the output torque of the impact wrench.

As shown in fig. 2 and 4, a clutch housing 55 is inserted into one end of the outer housing 1, an adjusting housing 12 is threaded on the end of the clutch housing 55 far away from the outer housing 1, the adjusting housing 12 and the clutch housing 55 are both covered on the clutch lever 5, a locking nut 13 is further threaded on the clutch housing 55, and the locking nut 13 is abutted against the adjusting housing 12. The side of the positioning sleeve 63 facing away from the torsion spring 62 is provided with an ejector pin 64, the ejector pin 64 being held in abutment with the inner bottom wall of the adjustment housing 12.

By rotating the adjusting shell 12, the relative position of the adjusting shell 12 on the clutch shell 55 is changed, and the adjusting shell 12 is linked with the ejector pin 64 to adjust the position of the positioning sleeve 63, so that the compression amount of the torque spring 62 is adjusted. The greater the amount of compression of the torque spring 62, the greater the resistance experienced by the output shaft 4, and the greater the torque output. Conversely, the smaller the resistance received by the output shaft 4, the smaller the torque output.

When the tool is adjusted to the required torque, the lock nut 13 abuts against the adjusting shell 12 to fix the relative position of the adjusting shell 12 on the clutch shell 55, so that the problem that the output torque is unstable due to the fact that the adjusting shell 12 and the positioning sleeve 63 are loosened and displaced by vibration generated in the working process of the impact wrench is avoided.

As shown in fig. 2, a circuit board 14 electrically connected to the brushless motor 2 is further disposed in the outer housing 1, a temperature controlled switch 15 and a forward/reverse switch 16 are mounted on the circuit board 14, and when the temperature of the working environment changes, the temperature controlled switch 15 is turned on or off to protect the impact wrench to safely operate, or to control the operation of the impact wrench to achieve an ideal temperature and energy saving effect.

The implementation principle of the application is as follows: the brushless motor 2 is matched with the gear box 3 and the output shaft 4 to output power, the boss 71 is in contact with the impact ball 72, the output shaft 4 drives the clutch sleeve 61 to transmit power through the impact ball 72 under the action of resistance, and the clutch rod 5 rotates to screw the screw tightly. After the screw is tightened, the clutch lever 5 stops rotating, the brushless motor 2 continues to provide power, and the output shaft 4 overcomes the resistance between the impact ball 72 and the boss 71. At this time, the boss 71 pushes up the clutch sleeve 61 by the impact ball 72, the clutch sleeve 61 continues to reciprocate axially, the torque spring 62 is compressed, the slip impact effect is achieved, and the torque setting is achieved. Brushless motor 2 makes output power stable, and the security performance is high, has guaranteed the speed that the screw was screwed up simultaneously, strikes ball 72, boss 71 and separation and reunion cover 61 and cooperatees, realizes deciding after the impact of skidding and turns round, has finally effectively improved the operating quality.

This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (7)

1. An electric impact wrench, comprising:

the input end of the gear box is connected with the brushless motor, and the output end of the gear box is connected with the output shaft;

the clutch rod is in transmission connection with the output shaft through an impact assembly;

the torque fixing assembly comprises a clutch sleeve, a torque spring and a positioning sleeve which are sequentially sleeved on the clutch rod, the torque spring elastically abuts between the clutch sleeve and the positioning sleeve, and when the screw is screwed down, the clutch sleeve moves axially along the clutch rod under the driving of the impact assembly to slip and impact the torque spring to realize torque fixing;

the impact assembly comprises a boss arranged on the end face of the output shaft and an impact ball, a mounting groove is formed in the end face of the clutch sleeve, and when the screw is not screwed down, the impact ball is partially embedded in the mounting groove, partially protrudes out of the mounting groove and is abutted to the side wall of the boss and the end face of the output shaft.

2. An electric impact wrench according to claim 1, wherein at least two of said impact assemblies are symmetrically disposed about a centerline of said clutch lever.

3. The electric impact wrench as claimed in claim 1, wherein a first sliding groove is formed in a peripheral wall of the clutch lever, a second sliding groove is formed in an inner wall of the clutch sleeve, the first sliding groove and the second sliding groove are both arranged along an axial direction of the clutch lever, the first sliding groove and the second sliding groove are arranged in a facing manner to form an installation space, and a ball is arranged in the installation space and abuts against a space between the clutch lever and the clutch sleeve.

4. The electric impact wrench according to claim 3, wherein the first sliding grooves are symmetrically arranged around a center line of the clutch lever, and the first sliding grooves, the second sliding grooves and the balls are arranged in a one-to-one correspondence manner.

5. The electric impact wrench of claim 1, further comprising an outer housing, wherein the brushless motor, the gear box and the impact assembly are all contained in the outer housing, and a start switch is further disposed on the outer housing to control the opening and closing of the brushless motor.

6. The electric impact wrench of claim 5, wherein a circuit board electrically connected to the brushless motor is further disposed in the outer housing, and a temperature-controlled switch and a forward/reverse switch are mounted on the circuit board.

7. The electric impact wrench as claimed in claim 6, wherein an adjusting housing is connected to one end of the outer housing through a clutch housing, the adjusting housing is sleeved on the clutch housing, a knock pin is disposed on a side of the positioning sleeve facing away from the torque spring, and the knock pin abuts against an inner bottom wall of the adjusting housing.

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