CN219582721U - Impact wrench - Google Patents

Abstract

The utility model discloses an impact wrench. The impact wrench includes: the device comprises a shell and a handle connected with the shell, wherein a driving part, a transmission part and an output part are sequentially arranged in the shell; the driving part comprises a driving motor which drives the main shaft to rotate; the transmission part comprises a gear ring, an external gear is arranged in the gear ring in a meshed manner, and the external gear is meshed with the main shaft; locking assemblies are arranged on two axial sides of the gear ring and used for fixing the gear ring; the output part comprises a driving impact piece connected with the external gear, and one end of the driving impact piece, which is far away from the driving part, is connected with a driven impact piece; one end of the handle is connected with the shell, and the other end of the handle is provided with a mounting part. Through the mode, the internal gear ring of the impact wrench can be locked, and the loosening of the structure caused by vibration generated in the working process is prevented.

Description

Impact wrench

Technical Field

The utility model relates to the field of hand tools, in particular to an impact wrench.

Background

The impact wrench tightens a bolt or a nut by applying an impact force generated by an active impact member driven to rotate to a base as an output shaft.

In the use process of the conventional impact wrench, the internal fluted disc is influenced in the vibration process of the fluted disc due to striking, looseness is generated, the meshing of the internal gear of the shell is influenced, and thus the transmission effect of force cannot be realized, and the normal work of the impact wrench is influenced.

In addition, severe vibration can also seriously affect the communication of the battery pack in the impact wrench and the structural stability of the battery pack, so that the whole machine cannot work. Meanwhile, as the torque of the impact wrench is increased, the impact wrench and the battery pack are rubbed with each other due to vibration, the temperature of the mounting base of the impact wrench is increased due to heat generation caused by friction, and plastic of the mounting base is easily melted.

Disclosure of Invention

To overcome the above drawbacks, the present utility model aims to: the impact wrench is simple in structure, stable and reliable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an impact wrench, comprising: a shell and a handle connected with the shell,

the inside of the shell is sequentially provided with a driving part, a transmission part and an output part;

the driving part comprises a driving motor which drives the main shaft to rotate;

the transmission part comprises a gear ring, an external gear is arranged in the gear ring in a meshed manner, and the external gear is meshed with the main shaft;

locking assemblies are arranged on two axial sides of the gear ring and used for fixing the gear ring;

the output part comprises a driving impact piece connected with the external gear, and one end of the driving impact piece, which is far away from the driving part, is connected with a driven impact piece;

one end of the handle is connected with the shell, and the other end of the handle is provided with a mounting part for mounting the battery pack.

Through the design, the gear ring position inside the shell can be locked, and the gear ring is prevented from loosening under the condition of overlarge vibration.

In a preferred embodiment, the locking assembly includes a fastening groove formed in the inner wall of the housing, and a fastening block is disposed on one side of the gear ring in a matching manner, and the fastening block is inserted into the fastening groove. By means of the design, the gear ring can be locked, and circumferential movement of the gear ring is prevented.

In a preferred embodiment, the locking assembly further includes a limiting member disposed on a side of the gear ring away from the fastening block, the limiting member is clamped on the inner wall of the housing and partially protrudes out of the inner surface of the housing, and the limiting member and the side wall of the gear ring are mutually abutted. By means of the design, the gear ring can be locked, and the gear ring is prevented from moving axially.

In a preferred embodiment, the active impact member comprises an intermediate shaft, one end of the intermediate shaft is connected with a bearing assembly, the bearing assembly comprises a first bearing plate and a second bearing plate which are parallel to each other and are connected with each other, mounting holes are formed in the first bearing plate and the second bearing plate, and the axle center of the external gear is arranged in the mounting holes in a penetrating mode through the connecting shaft. By such design, the central shaft can be driven to synchronously rotate by the rotation of the external gear

In a preferred embodiment, a cavity is formed between the bearing assembly and the intermediate shaft, and the main shaft portion is disposed in the cavity. By such a design, the engagement of the spindle with the external gear can be ensured.

In a preferred embodiment, the intermediate shaft is circumferentially sleeved with a shaft sleeve, the respective side surfaces of the intermediate shaft opposite to the shaft sleeve are provided with grooves, and balls are arranged in the grooves. By such a design it is possible.

In a preferred embodiment, the front end surface of the shaft sleeve, which is close to the driven impact piece, is provided with a plurality of protruding blocks.

In a preferred embodiment, the driven impact member includes an output shaft, and a base is provided at an end of the output shaft near the front end surface of the sleeve, the base extending in a radial direction of the output shaft. By such a design, the rotational movement of the rotor, during rotation,

in a preferred embodiment, a trigger is provided on the handle, the trigger being connected to a microswitch provided inside the handle. By such a design, the trigger can be pulled to start the impact wrench.

In a preferred embodiment, a receiving groove is formed in one side, far away from the shell, of the mounting portion, an elastic piece is arranged in the receiving groove, and the elastic piece protrudes out of the surface of the mounting portion. Through such design, elastic component and battery package butt lighten the vibration influence that the battery package received in the course of the work, improve connection stability.

Advantageous effects

According to the impact wrench provided by the utility model, the locking assemblies are arranged on the two axial sides of the gear ring in the shell to fix the position of the gear ring, so that the structure looseness or position deviation of the gear ring caused by severe vibration generated in the working process is prevented, and the transmission effect of the internal force of the impact wrench is influenced. Meanwhile, an elastic piece is arranged in the mounting seat of the handle, the elastic piece is clamped between the mounting seat and the battery pack, the stable connection between the battery pack and the mounting seat is realized,

preventing falling off and reducing friction heat generation.

Drawings

The accompanying drawings are included to provide an understanding of the technical aspects of the present disclosure, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present disclosure and together with the embodiments of the disclosure, not to limit the technical aspects of the present disclosure. The shapes and sizes of the various components in the drawings are not to scale, and are intended to illustrate the present utility model only.

FIG. 1 is a schematic perspective view of an impact wrench according to an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of an impact wrench according to an embodiment of the present utility model;

FIG. 3 is an enlarged partial schematic view of FIG. 2A;

FIG. 4 is a schematic cross-sectional view of an impact wrench according to another embodiment of the present utility model;

FIG. 5 is an enlarged partial schematic view at B in FIG. 4;

FIG. 6 is a perspective view of an impact wrench with a battery pack hidden from view according to an embodiment of the present utility model;

FIGS. 7-8 are schematic views showing the structure of the output end of the impact wrench according to the embodiment of the utility model;

reference numerals:

100. an impact wrench;

1. a housing; 101. a first housing; 102. a second housing; 103. a third housing;

11. a driving section; 111. a driving motor; 112. a main shaft;

12. a transmission part; 121. a gear ring; 122. a locking assembly; 1221. a buckle block; 1222. a buckle groove; 1223. a limiting piece; 123. an external gear;

13. an output unit; 131. a carrier assembly; 1311. a first bearing plate; 1312. a second bearing plate; 132. an intermediate shaft; 133. a cavity; 134. a through hole; 135. a shaft sleeve; 1351. a groove; 1352. a ball; 1353. a first end face; 1354. a protruding block; 136. an output shaft; 137. a base;

2. a handle;

21. a trigger; 211. a micro-switch;

22. a mounting base; 221. a receiving groove; 222. an elastic member; 223. a guide groove;

3. and a battery pack.

Detailed Description

The above-described aspects are further described below in conjunction with specific embodiments. It should be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. The implementation conditions employed in the examples may be further adjusted as in the case of the specific manufacturer, and the implementation conditions not specified are typically those in routine experiments.

Next, an impact wrench (hereinafter referred to as impact wrench) according to the present utility model will be described with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of an impact wrench according to the present utility model.

As shown in fig. 1, the impact wrench 100 includes a housing 1 and a handle 2, a driving portion 11 and an output portion 13 are provided inside the housing 1, and a transmission portion 12 is provided between the driving portion 11 and the output portion 13. The driving part 11 outputs power, and transmits the power to the output part 13 through the transmission part 12, so as to drive the output part 13 to complete the rotary striking motion.

As shown in fig. 1 to 3, the housing 1 is constituted by a first housing 101, a second housing 102, and a third housing 103 by bolting. The disassembly and assembly are convenient, and the internal maintenance and other works are carried out.

The first housing 101 is provided with a driving part 11, and the driving part 11 includes a driving motor 111 for supplying power, and the driving motor 111 drives a main shaft 112 to rotate.

As shown in fig. 1-5, a transmission part 12 is configured in the second housing 102, the transmission part 12 includes a gear ring 121 clamped on an inner wall of the second housing 102, locking components 122 are disposed on two axial sides of the gear ring 121, the locking components 122 include a plurality of fastening blocks 1221 disposed on one side of the gear ring 121, the fastening blocks 1221 are circumferentially arranged along a sidewall of the gear ring 121, a plurality of fastening slots 1222 are cooperatively provided on the inner wall of the second housing 102, and the fastening blocks 1221 are clamped in the fastening slots 1222 to fix the gear ring 121 from circumferential rotation. The side of the gear ring 121, which is far away from the buckling block 1221, is provided with a limiting piece 1223, the limiting piece 1223 is annular, the limiting piece 1223 is fixedly clamped on the inner wall of the second shell 102, the limiting piece 1223 protrudes out of the inner surface of the second shell 102 and is mutually abutted with the side wall of the gear ring 121, and the gear ring 121 is fixed to prevent horizontal axial movement. The locking structure is simple, effectively saves the inner space of the shell 1, and simultaneously, prevents the vibration generated in the working process of the impact wrench from loosening or moving the gear ring 121, influences the transmission of force and causes the damage of the inner parts of the impact wrench 100.

As shown in fig. 1 to 5, the ring gear 121 is internally meshed with an external gear 123, the end of the main shaft 112 is cooperatively provided with teeth which mesh with the external gear 123, the rotation of the main shaft 112 drives the external gear 123 to rotate around the axis of the main shaft 112, and the ring gear 121 is fixed on the second housing 102 without rotation. The rotation of the main shaft 112 can be decelerated in association with the ratio between the number of teeth of the external gear 123 and the number of teeth of the ring gear 121, and the torque is increased.

As shown in fig. 1 to 5, the output portion 13 disposed in the third housing 103 includes a driving impact member connected to the external gear 123, one end of the driving impact member away from the driving portion 11 is connected to a driven impact member, and the driven impact member is driven to rotate by the driving impact member.

As shown in fig. 1 to 5, specifically, the active impact member includes an intermediate shaft 132, one end of the intermediate shaft 132 near the external gear 123 is provided with a bearing assembly 131, and the bearing assembly 131 is connected with the external gear 123, so that the external gear 123 rotates along the main shaft 112 and drives the intermediate shaft 132 to rotate through the bearing assembly 131, and in this embodiment, the bearing assembly 131 and the intermediate shaft 132 may be integrally formed. Specifically, the carrier assembly 131 includes a first carrier plate 1311 and a second carrier plate 1312 that are parallel to each other and connected to each other, and the external gear 123 is disposed between the first carrier plate 1311 and the second carrier plate 1312. Mounting holes (not labeled) are correspondingly formed in the first bearing plate 1311 and the second bearing plate 1312, the axle center of the external gear 123 is fixedly arranged in the mounting holes through a mounting shaft (not labeled), and the external gear 123 rotates and drives the first bearing plate 1311 and the second bearing plate 1312 to synchronously rotate.

As shown in fig. 1-5, a cavity 133 is disposed between the bearing assembly 131 and the intermediate shaft 132, through holes 134 are formed at positions of the first bearing plate 1311 and the second bearing plate 1312 corresponding to the cavity, the through holes 134 are communicated with the cavity 133, one end of the main shaft 112 with teeth passes through the through holes 134 and is partially disposed in the cavity 133, so as to ensure that the teeth at the end of the main shaft 112 are meshed with the external gear 123, and the main shaft 112 rotates to drive the external gear 123 to rotate.

As shown in fig. 1-5, the driven impact member includes an output shaft 136, the axis of the output shaft 136 is coaxial with the intermediate shaft 132, and the axis of the intermediate shaft 132 is coaxial with the main shaft 112, all of which are located on the same axis.

As shown in fig. 4 to 7, the output shaft 136 is provided with a pedestal 137 near one end of the intermediate shaft 132, the pedestal 137 extending in the radial direction of the output shaft 136. Correspondingly, a shaft sleeve 135 is circumferentially sleeved at one end of the intermediate shaft 132 far away from the bearing assembly 131, grooves 1351 are formed in the respective opposite side surfaces of the intermediate shaft 132 and the shaft sleeve 135, and balls 1352 are correspondingly arranged in the grooves 1351. The first end surface 1353 of the sleeve 135 adjacent to the base 137 is provided with a protruding block 1354, and specifically, the first end surface 1353 is provided with two opposite protruding blocks 1354. When the shaft sleeve 135 rotates, the boss 1354 blocks the base 137, and during the hammering process, the boss 1354 hits the base 137, driving the output shaft 136 to complete the hammering operation. The height of the raised bump 1354 raised from the first end surface 1353 is substantially the same as the axial thickness of the base 137, ensuring that the striking frequency thereof remains consistent.

As shown in fig. 1 to 6, the impact wrench 100 further includes a handle 2, one end of the handle 2 is connected to the housing 1, and the other end is connected to a mount 22. The battery pack 3 is connected to the mounting base 22 to supply electric power. The handle 2 is also provided with a trigger 21, the trigger 21 is connected with a micro switch 211 positioned in the handle 2, the trigger 21 is triggered, the micro switch 211 is triggered, and the impact wrench 100 is started.

As shown in fig. 1 to 8, specifically, a receiving groove 221 is formed on a side of the mounting seat 22 away from the housing 1, an elastic member 222 is disposed in the receiving groove 221, the elastic member 222 protrudes from a surface of the mounting seat 22 facing the battery pack 3, and when the battery pack 3 is mounted on the mounting seat 22, the battery pack 3 and the elastic member 222 are abutted against each other. During the operation of the impact wrench 100, the vibration generated from the battery pack 3 is reduced by the buffering action of the elastic member 222, and the connection stability is enhanced. The mounting seat 22 is also provided with a guide groove 223, the battery pack 3 is correspondingly provided with a bulge, and the bulge slides into the mounting seat along the guide groove 223 and then is fixed on the mounting seat, so that the electrode of the battery pack is electrically connected with the terminal part of the mounting seat 22, and power supply is realized. Preferably, the elastic member 222 is disposed at a side of the terminal portion remote from the mounting base 22, so that both ends of the battery pack 3 are stably connected to the mounting base 22. Preferably, in the present embodiment, the elastic member 222 has a cylindrical structure, and the axis of the elastic member 222 is perpendicular to the extending direction of the guiding groove 223.

It should be noted that, in the above embodiments, the technical features such as "housing", "handle", "driving portion", "transmission portion", "output portion", "trigger", "micro switch", "mounting seat", "battery pack", "gear ring", "gear", "locking assembly" and the like may be arbitrarily combined, and for brevity of description, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description in this specification.

The above embodiments are provided to illustrate the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the present utility model and implement the same according to the present utility model, not to limit the scope of the present utility model. All equivalent changes or modifications made by the spirit of the utility model are intended to be covered by the scope of the utility model.

Claims (10)

1. An impact wrench, comprising:

a shell and a handle connected with the shell,

a driving part, a transmission part and an output part are sequentially arranged in the shell;

the driving part comprises a driving motor which drives the main shaft to rotate;

the transmission part comprises a gear ring, an external gear is arranged in the gear ring in a meshed manner, and the external gear is meshed with the main shaft;

locking assemblies are arranged on two axial sides of the gear ring and used for fixing the gear ring;

the output part comprises a driving impact piece connected with the external gear, and one end of the driving impact piece, which is far away from the driving part, is connected with a driven impact piece;

one end of the handle is connected with the shell, and the other end of the handle is provided with a mounting part for mounting the battery pack.

2. The impact wrench of claim 1, wherein the impact wrench,

the locking assembly comprises a buckling groove formed in the inner wall of the shell, a buckling block is arranged on one side of the gear ring in a matched mode, and the buckling block is inserted into the buckling groove.

3. The impact wrench of claim 2, wherein the impact wrench,

the locking assembly further comprises a limiting piece arranged on one side, away from the buckling block, of the gear ring, the limiting piece is clamped on the inner wall of the shell, part of the limiting piece protrudes out of the inner surface of the shell, and the limiting piece is in mutual butt joint with the side wall of the gear ring.

4. The impact wrench of claim 1, wherein the impact wrench,

the driving impact piece comprises an intermediate shaft, one end of the intermediate shaft is connected with a bearing assembly, the bearing assembly comprises a first bearing plate and a second bearing plate which are parallel to each other and are connected with each other, mounting holes are formed in the first bearing plate and the second bearing plate, and the axle center of the external gear is arranged in the mounting holes in a penetrating mode through a connecting shaft.

5. The impact wrench of claim 4, wherein the impact wrench,

a cavity is formed between the bearing assembly and the intermediate shaft, and the main shaft part is arranged in the cavity.

6. The impact wrench of claim 4, wherein the impact wrench,

the middle shaft is circumferentially sleeved with a shaft sleeve, grooves are formed in the side faces, opposite to the shaft sleeve, of the middle shaft, and balls are arranged in the grooves.

7. The impact wrench of claim 6, wherein the impact wrench,

the shaft sleeve is provided with a plurality of protruding blocks on the front end face close to the driven impact piece.

8. The impact wrench of claim 7, wherein the impact wrench,

the driven impact piece comprises an output shaft, a base is arranged at one end, close to the front end face of the shaft sleeve, of the output shaft, and the base extends along the radial direction of the output shaft.

9. The impact wrench of claim 1, wherein the impact wrench,

the handle is provided with a trigger which is connected to a micro switch arranged inside the handle.

10. The impact wrench of claim 1, wherein the impact wrench,

the mounting part is far away from one side of the shell body is provided with a containing groove, an elastic piece is arranged in the containing groove, and the elastic piece protrudes out of the surface of the mounting part.