CN116330205A - Impact tool - Google Patents

Abstract

The present disclosure discloses an impact tool. The impact tool includes: a housing; a motor disposed in the housing; a rotary impact device driven by the motor, and the rotary impact device includes: a main shaft driven by the motor to rotate around a first axis; The impact block is configured on the main shaft; and the anvil is matched with the impact block and struck by the impact block; the impact tool also includes: an output shaft configured to output torque, the output shaft is connected with the anvil, and is driven by the impact block to rotate around the second The axis rotates; the first axis is parallel to the second axis, and the distance between the first axis and the second axis is greater than or equal to 3mm and less than or equal to 15mm. The impact tool of the present disclosure has the advantages of wide application range, high work completion quality and convenient use.

Description

impact tool

technical field

The present disclosure relates to an electric tool, in particular to an impact tool.

Background technique

Impact tools, such as impact screwdrivers, impact wrenches, are commonly used for screwing in and out of fasteners in wood, metal, plastic, etc., rough drilling, installing and removing bolts, nuts, etc. Impact tools are capable of delivering torque through rotational and intermittent impacts. A disadvantage of many impact tools is that it is difficult for the user to use these impact tools in tight areas such as walls, L-shaped spaces, and the like. Although the user can barely apply the impact tool to the above-mentioned area by tilting the impact tool, since the impact tool is tilted, the fasteners installed by the impact tool are also tilted, and it is difficult for the user to connect the impact tool to the fastener that needs to be removed. Firmware alignment. In the related art, even if a few products are applied in a narrow area by changing their structure, these products are not ideal for users due to their complex structure and lack of impact function.

Contents of the invention

In order to solve the deficiencies of the prior art, the purpose of the present disclosure is to provide an impact tool with a wide application range, high quality of work completed and easy to use.

In order to achieve the above goals, the present disclosure adopts the following technical solutions:

The present disclosure provides an impact tool, comprising: a housing; a motor disposed in the housing; a rotary impact device driven by the motor, the rotary impact device comprising: a main shaft driven by the motor to rotate around a first axis; an impact block, Configured on the main shaft; and the anvil, which cooperates with the impact block and is struck by it; the impact tool also includes: an output shaft for outputting torque, the output shaft is connected with the anvil, and can rotate around the second axis driven by the impact block; The first axis is parallel to the second axis, and the distance between the first axis and the second axis is greater than or equal to 3mm and less than or equal to 15mm.

In some embodiments, the distance between the first axis and the second axis is greater than or equal to 5 mm and less than or equal to 10 mm.

In some embodiments, the housing includes: an upper housing portion having a highest point of the impact tool, the distance between the highest point and the second axis being greater than or equal to 17 mm and less than or equal to 21 mm.

In some embodiments, the impact block includes an impact portion; the anvil includes a force receiving portion; and the impact portion is for drivingly engaging the force receiving portion.

In some embodiments, the impact mass rotates about a first axis and is axially movable along the first axis.

In some embodiments, the housing has an inner side wall of the housing; the main shaft includes a receiving portion disposed on a side close to the anvil.

In some embodiments, the impact tool further includes: a first bearing installed on the inner wall of the casing; a second bearing fixedly connected with the impact block and arranged on the receiving portion.

In some embodiments, the first bearing is used to support the impact block; the second bearing is used to movably support the main shaft.

In some embodiments, the first bearing is fixedly connected to the inner wall of the casing; the second bearing rotates with the impact block around the first axis and can move axially with the impact block along the first axis.

The present disclosure also provides an impact tool, which includes: a housing; a motor disposed in the housing; a rotary impact device driven by the motor, the rotary impact device comprising: a main shaft driven by the motor to rotate around a first axis the impact block is configured on the main shaft; the anvil cooperates with the impact block and is struck by it; and the output shaft is used for outputting torque, the output shaft is connected with the anvil and can rotate around the second axis driven by the impact block; The output shaft includes: a front end surface and a rear end surface, the part of the second axis between the front end surface and the rear end surface is defined as an output axis section, and the output axis section is located above the first axis.

The benefit of this disclosure is that users can use impact tools in narrow areas, such as walls, L-shaped spaces, etc., increasing the scope of application of impact tools, and this disclosure can improve the quality of work, and help users easily operate in a small space. , Get the job done quickly.

Description of drawings

FIG. 1 is a perspective view of an impact tool according to one embodiment of the present disclosure.

FIG. 2 is a side view of the impact tool in FIG. 1 .

Fig. 3 is a cross-sectional view of the impact tool in Fig. 1 viewed along the radial direction.

FIG. 4 is an exploded view of the rotary impact device and transmission of the impact tool in FIG. 1 .

FIG. 5 is a radially sectional view of a partial structure of the impact tool in FIG. 1 .

FIG. 6 is a cross-sectional view of a partial structure of the impact tool in FIG. 1 viewed along the axial direction.

Detailed ways

The present disclosure will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments. The impact tool 100 in FIG. 1 is an impact screwdriver. In other embodiments, the impact tool 100 may also be a tool such as an impact wrench, which is not limited here. For the convenience of description, in this embodiment, the up-down direction and the front-back direction are set as shown in FIG. 1 . As shown in FIGS. 1 to 3 , the impact tool 100 of the present disclosure mainly includes: a housing 11 , a motor 12 , a rotary impact device 20 and an output shaft 13 . The casing 11 is used to accommodate the rotary impact device 20 and at least a part of the output shaft 13 , and the casing 11 is also formed with a handle 111 for a user to hold and a joint portion 112 for connecting an energy device. The handle 111 is provided with a switch 13 for activating and deactivating the impact tool. The motor 12 is arranged in the housing 11 and is used to drive the rotary impact device 20 . The driving method may be indirect driving through the transmission device 30 or direct driving. In this embodiment, the motor 12 is specifically an electric motor, the driving mode is indirect driving through the transmission device 30 , and the energy device is specifically a battery pack.

As shown in FIG. 4 , in this embodiment, the transmission device 30 includes a gear box 31, the gear box 31 is used to accommodate a first-stage planetary gear reduction system, and the first-stage planetary gear reduction system includes a plurality of single-stage planetary gears 321 for A planet carrier 322 supporting a plurality of single-stage planetary gears 321 , a sun gear 323 and a ring gear 324 . The motor 12 includes a motor shaft 121 extending toward the gearbox 31 . The motor shaft 121 is fixedly connected with the sun gear 323 and drives the sun gear 323 to rotate. The multiple single-stage planetary gears 321 mesh with the sun gear 323 , and the sun gear 323 drives the multiple single-stage planetary gears 321 to rotate. The ring gear 324 is fixedly arranged relative to the gear case 31 . A plurality of single-stage planetary gears 321 mesh with the ring gear 324 , crawl along the inner teeth of the ring gear 324 , and are fixedly connected with the planet carrier 322 . The gear box 31 forms a transmission connection with the rotary impact device 20 or is integrally formed, so as to transmit the rotation deceleration of the motor 12 to the rotary impact device 20 .

As shown in FIGS. 4 to 6 , the rotary impact device 20 is disposed between the motor 12 and the output shaft 13 . The rotary impact device 20 includes: a main shaft 21 , an impact block 22 and an anvil 23 . The main shaft 21 is driven by the motor 12 to rotate around the first axis 101 . The spindle 21 includes a receiving portion 211 , a connecting post 212 and a base 213 . The base 213 is fixedly connected or integrally formed with the planet carrier 322 . The connecting post 212 has an outer circumference and connects the receiving portion 211 and the base 213 . The rotary impact device 20 also includes a clutch mechanism 24 . The clutch mechanism 24 includes a cam 241 , such as a ball, which movably couples the impact block 22 to the main shaft 21 to limit the movement path of the impact block 22 along the main shaft 21 in the rotational direction and the axial direction. The clutch mechanism 24 also includes an elastic element 242, such as a spring, which is arranged between the impact block 22 and the transmission device 30, limits the axial displacement distance of the impact block 22 relative to the main shaft 21 along the first axis 101, and directs the impact block 22 towards the anvil. 23 bias. An accommodating groove 212 a is formed on the outer circumference of the connecting post 212 , the accommodating groove 212 a is specifically a V-shaped groove, and the accommodating groove 212 a is used for accommodating part of the cam 241 . The impact block 22 is disposed on the outer circumference of the connecting column 212 . The impact block 22 has an inner perimeter, and a groove 221 capable of matching with the receiving groove 212 a is formed on the inner perimeter of the impact block 22 , and the groove 221 is used for accommodating part of the cam 241 . The accommodating groove 212 a and the groove 221 jointly constitute the active channel 25 of the cam 241 and define the active path of the cam 241 . The impact mass 22 rotates about the first axis 101 . The impact block 22 includes a hollow portion 222 opening toward the transmission device 30 , and the hollow portion 222 is used for accommodating part of the elastic element 242 . The impact block also includes a through hole 223 for the main shaft 21 to pass through. The impact block 22 also includes an impact portion 224 axially protruding toward the anvil 23 . The anvil 23 is arranged at one end close to the striking portion 224, and cooperates with the striking block 22 and is struck by it. The anvil 23 includes a main body 231 and a force receiving portion 232 , and the force receiving portion 232 protrudes away from the main body 231 in the circumferential direction. The impact portion 224 is drivingly engaged with the force receiving portion 232 .

As shown in FIGS. 3 and 4 , the output shaft 13 rotates around the second axis 102 , the output shaft 13 is used for outputting torque, and is connected with the anvil 23 . The output shaft 13 and the anvil 23 can be formed separately or integrally. Preferably, the first axis 101 is parallel to the second axis 102, and the distance between the first axis 101 and the second axis 102 is greater than or equal to 3 mm and less than or equal to 15 mm. More preferably, the distance between the first axis 101 and the second axis 102 is greater than or equal to 5 mm and less than or equal to 10 mm. The first axis 101 and the second axis 102 are parallel and form a distance, so that the user can use the impact tool 100 side by side when working in a narrow area, such as an L-shaped area. This makes the fasteners installed by the user on the workpiece not tilted, and the connection between the workpieces is more stable, reliable and beautiful. The impact block 22 directly drives the anvil 23 and the output shaft 13 , without additional parts that indirectly transmit power to the output shaft 13 , does not increase the diameter of the impact tool 100 , and optimizes the welting effect of the impact tool 100 .

The output shaft 13 includes a front end surface 131 and a rear end surface 132 , the front end surface 131 is disposed on a side away from the anvil 23 , and the rear end surface 132 is disposed on a side close to the anvil 23 and connected to the anvil 23 . The portion of the second axis 102 between the front end surface 131 and the rear end surface 132 is defined as an output axis section 102a. The space above the paper projection of the first axis 101 is defined as above the first axis 101 . The output axis section 102 a is located above the first axis 101 .

The housing 11 includes a housing upper portion 113 defining a top surface 103 below which the impact tool 100 is located. The top surface 103 has the highest point 104 of the impact tool 100 . Preferably, the distance between the highest point 104 and the second axis 102 is greater than or equal to 17 mm and less than or equal to 21 mm.

When the main shaft 21 of the impact tool 100 is not coaxial with the rotational axis of the output shaft 13, if the structure when the main shaft 21 is coaxial with the rotational axis of the output shaft 13 is still used, it will cause the impact tool 100 to be difficult to operate, and may occur Increased vibration, decreased stability of the whole machine, etc. Specifically, if the main shaft 21 does not extend into the matching hole 133 of the output shaft 13 , the main shaft 21 , the impact block 22 and the output shaft 13 cannot support each other, which may cause damage or failure of the impact tool 100 . In view of the above problems, the present disclosure optimizes part of the structure of the impact tool 100 so that the main shaft 21 , the impact block 22 and the output shaft 13 can be better supported, thereby avoiding or at least alleviating the above problems.

As shown in FIGS. 4 to 6 , the impact tool 100 further includes a first bearing 14 for supporting the impact block 22 . The housing 11 has a housing inner side wall 114 . The first bearing 14 is fixedly installed on the inner side wall 114 of the housing and does not move. The first bearing 14 has a first bearing outer ring 141 and a first bearing inner ring 142 . The impact block 22 has an outer circumference. The first bearing outer ring 141 is in interference fit with the housing inner wall 114 , and the first bearing inner ring 142 is slidably engaged with the outer circumference of the impact block 22 . The impact tool 100 also includes a second bearing 15 for movably supporting the spindle 21 . The second bearing 15 is fixedly connected with the impact block 22 and arranged on the receiving portion 211 of the main shaft 21 . The second bearing 15 has a second bearing outer ring 151 and a second bearing inner ring 152 . The receiving portion 211 has an outer circumference. The second bearing outer ring 151 is in interference fit with the inner circumference of the impact block 22 , and the second bearing inner ring 152 is slidably engaged with the outer circumference of the receiving portion 211 . Therefore, when the impact block 22 rotates around the first axis 101 , the second bearing 15 rotates with the impact block 22 around the first axis 101 , and the second bearing 15 can also move axially with the impact block 22 along the first axis 101 .

The impact tool 100 is in the first mode when there is no load or a light load. The impact block 22 drives the anvil 23 to rotate together with the output shaft 13 . When the load is high, the impact tool 100 is in the second mode. During the rotation process, the impact part 224 impacts the force receiving part 232 intermittently to form an impact on the rotation direction of the output shaft 13 . Specifically, the impact block 22 may be located at a first axial position and a second axial position. In the first mode, the elastic element 242 biases the impact block 22 toward the anvil 23 , and the impact block 22 is located at a first axial position, that is, the most forward axial position that the impact block 22 can reach. At this time, the cam 241 cannot move in the movable channel 25 , the impact block 22 is fixed relative to the main shaft 21 , and the impact portion 224 engages with the force receiving portion 232 to drive the output shaft 13 to rotate. In the second mode, the cam 241 is movable in the active channel 25 . The impact block 22 overcomes the elastic force of the elastic element 242 , and rotates and moves backward along the first bearing inner ring 142 through the movement of the cam 241 in the movable channel 25 . The elastic element 242 deforms and stores energy. The second bearing 15 rotates along the outer circumference of the main shaft 21 and moves backward along with the impact block 22 . The impact portion 224 bypasses the force receiving portion 232 from behind, and the impact block 22 moves from the first axial position to the second axial position, which is the rearmost axial position that the impact block 22 can reach. When the impact block 22 reaches the second axial position, the elastic element 242 biases the impact block 22 toward the anvil 23 . The impact block 22 rotates and moves forward along the first bearing inner ring 142 through the movement of the cam 241 in the movable channel 25 . The second bearing 15 rotates and moves forward along with the impact block 22 along the outer circumference of the main shaft 21 . The impact block 22 returns to the first axial position. The impact part 224 strikes the force receiving part 232 to form an impact in the rotation direction.

The basic principles, main features and advantages of the present disclosure have been shown and described above. Those skilled in the industry should understand that the above embodiments do not limit the present disclosure in any form, and all technical solutions obtained by means of equivalent replacement or transformation fall within the protection scope of the present disclosure.

Claims (10)

1. An impact tool comprising: case; a motor arranged in the housing; a rotary impact device driven by the motor, the rotary impact device comprising: a main shaft, driven by the motor to rotate around a first axis; an impact block disposed on the spindle; and an anvil cooperating with and struck by the impact block; It is characterized in that, described impact tool also comprises: an output shaft configured to output torque, connected to the anvil, and driven by the impact block to rotate around a second axis; Wherein, the first axis is parallel to the second axis, and the distance between the first axis and the second axis is greater than or equal to 3 mm and less than or equal to 15 mm. 2. The impact tool according to claim 1, wherein the distance between the first axis and the second axis is greater than or equal to 5 mm and less than or equal to 10 mm. 3. The impact tool of claim 1, wherein the housing comprises: an upper housing portion having a highest point of the impact tool, the distance between the highest point and the second axis being greater than or equal to 17mm and less than or equal to 21mm. 4. The impact tool of claim 1, wherein: the impact block includes an impact portion; the anvil includes a force receiving portion; and the impact portion is configured to drivingly engage the force receiving portion. 5. The impact tool of claim 1, wherein the impact block rotates about the first axis and is configured to move axially along the first axis. 6. The impact tool according to claim 1, characterized in that: the housing has an inner side wall of the housing; the main shaft includes a receiving portion disposed on a side close to the anvil. 7. The impact tool according to claim 1, further comprising: a first bearing installed on the inner wall of the housing; a second bearing fixedly connected with the impact block and arranged on the receiving department. 8. The impact tool according to claim 7, wherein: the first bearing is configured to support the impact block; and the second bearing is configured to movably support the spindle. 9. The impact tool according to claim 7, characterized in that: the first bearing is fixedly connected to the inner wall of the housing; the second bearing rotates with the impact block around the first axis, and configured to move axially with the impact block along the first axis. 10. An impact tool comprising: case; a motor disposed within the housing; a rotary impact device driven by the motor, the rotary impact device comprising: a main shaft, driven by the motor to rotate around a first axis; an impact block configured on the main shaft; an anvil engaged with and struck by the impact block; and an output shaft configured to output torque, connected to the anvil, and driven by the impact block to rotate about a second axis; It is characterized in that the output shaft comprises: The front end face and the rear end face, the portion of the second axis between the front end face and the rear end face is defined as an output axis section, the output axis section is located above the first axis.

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