Impact tool

Abstract

The present disclosure discloses an impact tool, comprising: a housing; a motor arranged in the housing; a rotary impact device driven by the motor, the rotary impact device comprising: a main shaft rotating around a first axis under the driving of the motor; an impact block arranged on the main shaft; and an anvil cooperating with the impact block and being struck by the impact block; the impact tool further comprises: an output shaft arranged to output torque, the output shaft being connected with the anvil and rotating around a second axis under the driving of 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 3 mm and less than or equal to 15 mm. The impact tool of the present disclosure has wide application range, high work completion quality and convenient use.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a power tool, in particular to an impact tool. BACKGROUND

[0002] Impact tools, such as impact screwdrivers, impact wrenches, are commonly used to drive and remove fasteners, roughen holes, install and remove bolts, nuts, etc. on wood, metal, plastic, etc. Impact tools are capable of outputting torque through rotation and intermittent impact. One drawback of many impact tools is that it is difficult for users to use these impact tools in narrow areas, such as wall edges, L-shaped spaces, etc. Although users can tilt the impact tools to force the impact tools to be applied to the above-mentioned areas, it is also difficult for users to align the impact tools with the fasteners to be removed because the impact tools are tilted and the fasteners installed by the impact tools are also tilted. In the related art, even though there are a few products that can be applied in narrow areas by changing their structures, these products are complex in structure and lack impact functions, which are not the most ideal for users. SUMMARY

[0003] To solve the problems in the prior art, the purpose of the present disclosure is to provide an impact tool with wide application range, high work completion quality and convenient use.

[0004] To achieve the above-mentioned objectives, the present disclosure adopts the following technical solutions:

[0005] The present disclosure provides an impact tool, comprising: a housing; a motor arranged in the housing; a rotary impact device driven by the motor, the rotary impact device comprising: a main shaft rotating around a first axis under the drive of the motor; an impact block arranged on the main shaft; and an anvil cooperating with the impact block and being struck by the impact block; the impact tool further comprising: an output shaft for outputting torque, the output shaft being connected with the anvil and being capable of rotating around a second axis under the drive of 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.

[0006] In some embodiments, the distance between the first axis and the second axis is greater than or equal to 5mm and less than or equal to 10mm.

[0007] In some embodiments, the housing comprises: a housing upper portion having a highest point of the impact tool, and the distance between the highest point and the second axis is greater than or equal to 17mm and less than or equal to 21mm.

[0008] In some embodiments, the impact block comprises an impact portion; the anvil comprises a force receiving portion; and the impact portion is drivingly engaged with the force receiving portion.

[0009] In some embodiments, the impact block rotates around the first axis and is capable of moving axially along the first axis.

[0010] In some embodiments, the housing has a housing inner side wall; the main shaft comprises a receiving portion arranged at a side close to the anvil.

[0011] In some embodiments, the impact tool further comprises: a first bearing mounted on the housing inner side wall; and a second bearing fixedly connected with the impact block and arranged on the receiving portion.

[0012] In some embodiments, the first bearing is configured to support the impact block; and the second bearing is configured to movably support the main shaft.

[0013] In some embodiments, the first bearing is fixedly connected with the housing inner side wall; and the second bearing rotates with the impact block around the first axis and is capable of moving axially along the first axis with the impact block.

[0014] The present disclosure further provides an impact tool, comprising: a housing; a motor arranged in the housing; and a rotary impact device driven by the motor, the rotary impact device comprising: a main shaft rotating around a first axis under the driving of the motor; an impact block arranged on the main shaft; an anvil cooperating with the impact block and being impacted by the impact block; and an output shaft for outputting torque, the output shaft being connected with the anvil and being capable of rotating around a second axis under the driving of the impact block; the output shaft comprising: a front end face and a rear end face, and a portion between the front end face and the rear end face of the second axis being defined as an output axis segment, the output axis segment being located above the first axis.

[0015] The present disclosure has the advantages that: a user is able to use the impact tool in a narrow area, such as a wall side, an L-shaped space, etc., thereby increasing the application range of the impact tool, and the present disclosure is capable of improving the work completion quality and helping the user to simply and quickly complete work in a small space. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a perspective view of an impact tool according to an embodiment of the present disclosure.

[0017] Figure 2 is a side view of the impact tool in Figure 1

[0018] Figure 3 is a radial view of a sectional view of the impact tool in Figure 1

[0019] Figure 4 is an exploded view of a rotary impact device and a transmission device of the impact tool in Figure 1

[0020] Figure 5 is a radial view of a sectional view of a partial structure of the impact tool in Figure 1 ​​​​

[0021] Figure 6 yes Figure 1 A cross-sectional view of part of the impact tool viewed along the axial direction. Detailed Implementation

[0022] The present disclosure will now be described in detail with reference to the accompanying drawings and specific embodiments. Figure 1 The impact tool 100 in this embodiment is an impact screwdriver. In other embodiments, the impact tool 100 may also be an impact wrench or other similar tool, and is not limited here. For ease of explanation, this embodiment is provided with such... Figure 1 The up / down and front / back directions are shown. For example... Figures 1 to 3 As shown, the impact tool 100 of this disclosure mainly includes: a housing 11, a motor 12, a rotary impact device 20, and an output shaft 13. The housing 11 houses the rotary impact device 20 and at least a portion of the output shaft 13. The housing 11 also has a handle 111 for a user to grip and a connection portion 112 for connecting a power source. A switch 13 for starting and stopping the impact tool is provided on the handle 111. The motor 12 is disposed within the housing 11 and drives the rotary impact device 20. The driving method can be indirect driving via a transmission device 30 or direct driving. In this embodiment, the motor 12 is specifically an electric motor, the driving method is indirect driving via a transmission device 30, and the power source is specifically a battery pack.

[0023] like Figure 4 As shown, in this embodiment, the transmission device 30 includes a gearbox 31, which houses a single-stage planetary gear reduction system. The single-stage planetary gear reduction system includes multiple single-stage planetary gears 321, a planet carrier 322 supporting the multiple 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 to 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 disposed relative to the gearbox 31. The multiple single-stage planetary gears 321 mesh with the ring gear 324, crawl along the internal teeth of the ring gear 324, and are fixedly connected to the planet carrier 322. The gearbox 31 and the rotary impact device 20 form a transmission connection or are integrally formed, thereby transmitting the rotational reduction of the motor 12 to the rotary impact device 20.

[0024] like Figures 4 to 6As shown, the rotary percussion device 20 is arranged between the motor 12 and the output shaft 13. The rotary percussion device 20 comprises a main shaft 21, a percussion block 22 and an anvil 23. The main shaft 21 is rotatable about the first axis 101 under the drive of the motor 12. The main shaft 21 comprises a receiving portion 211, a connecting column 212 and a base 213. The base 213 is fixedly connected or integrally formed with the planet carrier 322. The connecting column 212 has an outer circumference and connects the receiving portion 211 and the base 213. The rotary percussion device 20 further comprises a clutch mechanism 24. The clutch mechanism 24 comprises a cam 241, such as a ball, movably coupling the percussion block 22 with the main shaft 21 to limit the path of the percussion block 22 moving along the main shaft 21 in the rotational direction and the axial direction. The clutch mechanism 24 further comprises a resilient element 242, such as a spring, arranged between the percussion block 22 and the transmission device 30 to limit the axial displacement distance of the percussion block 22 relative to the main shaft 21 along the first axis 101 and to bias the percussion block 22 towards the anvil 23. The connecting column 212 has an outer circumference, and a receiving groove 212a, in particular a V-shaped groove, is formed on the outer circumference of the connecting column 212. The receiving groove 212a is configured to accommodate part of the cam 241. The percussion block 22 is arranged on the outer circumference of the connecting column 212. The percussion block 22 has an inner circumference, and a groove 221 is formed on the inner circumference of the percussion block 22. The groove 221 is configured to accommodate part of the cam 241. The receiving groove 212a and the groove 221 jointly form a movable passage 25 of the cam 241 and define a movable path of the cam 241. The percussion block 22 is rotatable about the first axis 101. The percussion block 22 comprises a hollow portion 222 opening towards the transmission device 30, and the hollow portion 222 is configured to accommodate part of the resilient element 242. The percussion block further comprises a through hole 223 configured to allow the main shaft 21 to pass through. The percussion block 22 further comprises a percussion portion 224 protruding axially towards the anvil 23. The anvil 23 is arranged at one end close to the percussion portion 224 and cooperates with the percussion block 22 and is impacted by the percussion block 22. The anvil 23 comprises a main body 231 and a force receiving portion 232 protruding circumferentially away from the main body 231. The percussion portion 224 is drivingly engaged with the force receiving portion 232.

[0025] As Figure 3 and Figure 4As shown, the output shaft 13 rotates around the second axis 102, and is used to output torque and is connected with the anvil 23. The output shaft 13 and the anvil 23 can be separate parts 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 parallel first axis 101 and the second axis 102 form a distance, which facilitates the user to use the impact tool 100 in a narrow area, such as an L-shaped area. This makes the fasteners installed by the user on the workpiece not inclined, 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 the need for additional parts to indirectly transmit power to the output shaft 13, without increasing the diameter of the impact tool 100, and optimizing the edge effect of the impact tool 100.

[0026] The output shaft 13 includes a front end surface 131 and a rear end surface 132, the front end surface 131 is arranged on the side away from the anvil 23, and the rear end surface 132 is arranged on the side close to the anvil 23 and connected with the anvil 23. The second axis 102 is located between the front end surface 131 and the rear end surface 132, and is defined as an output shaft segment 102a. The space above the paper projection of the first axis 101 is defined as above the first axis 101. The output shaft segment 102a is located above the first axis 101.

[0027] The housing 11 includes a housing upper portion 113, which defines a top surface 103, and the impact tool 100 is located below the top surface 103. The top surface 103 has a 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.

[0028] When the main shaft 21 of the impact tool 100 is not coaxial with the rotation axis of the output shaft 13, if the structure when the main shaft 21 is coaxial with the rotation axis of the output shaft 13 is still used, it will cause the impact tool 100 to be difficult to operate, and at the same time, problems such as increased vibration and decreased stability of the whole machine may occur. Specifically, the main shaft 21 does not extend into the matching hole 133 of the output shaft 13, and 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 impact tool 100 is optimized in part, 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.

[0029] As shown in FIG. 1, the impact tool 100 includes a housing 11, a main shaft 21, an impact block 22 and an output shaft 13. The main shaft 21 is arranged in the housing 11, and the impact block 22 is arranged on the main shaft 21. The output shaft 13 is arranged on the main shaft 21 and is connected with the impact block 22. The output shaft 13 is used to output torque and is connected with the anvil 23. The output shaft 13 and the anvil 23 can be separate parts 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 parallel first axis 101 and the second axis 102 form a distance, which facilitates the user to use the impact tool 100 in a narrow area, such as an L-shaped area. This makes the fasteners installed by the user on the workpiece not inclined, 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 the need for additional parts to indirectly transmit power to the output shaft 13, without increasing the diameter of the impact tool 100, and optimizing the edge effect of the impact tool 100. Figures 4 to 6As shown, the impact tool 100 further comprises 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 mounted on the housing inner side wall 114 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 side wall 114, and the first bearing inner ring 142 is in slidable engagement with the outer circumference of the impact block 22. The impact tool 100 further comprises a second bearing 15 for movably supporting the spindle 21. The second bearing 15 is fixedly connected with the impact block 22 and is arranged on the spindle 21 receiving portion 211. 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 in slidable engagement 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 around the first axis 101 with the impact block 22, and the second bearing 15 can also move axially along the first axis 101 with the impact block 22.

[0030] When the load is small, the impact tool 100 is in the first mode. The impact block 22 drives the anvil 23 and the output shaft 13 to rotate together. When the load is large, the impact tool 100 is in the second mode. The impact portion 224 intermittently strikes the force receiving portion 232 during rotation, forming an impact on the rotation direction of the output shaft 13. Specifically, the impact block 22 can 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 towards the anvil 23, and the impact block 22 is located at the first axial position, which is the most forward axial position that the impact block 22 can reach. At this time, the cam 241 cannot move in the active 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 can move in the active channel 25. The impact block 22 overcomes the elastic force of the elastic element 242, and rotates backward along the first bearing inner ring 142 through the movement of the cam 241 in the active channel 25. The elastic element 242 is deformed and stores energy. The second bearing 15 moves backward along the outer circumference of the main shaft 21 with the impact block 22. The impact portion 224 bypasses the force receiving portion 232 from the back, and the impact block 22 moves from the first axial position to the second axial position, which is the most rearward 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 towards the anvil 23. The impact block 22 rotates forward along the first bearing inner ring 142 through the movement of the cam 241 in the active channel 25. The second bearing 15 moves forward along the outer circumference of the main shaft 21 with the impact block 22. The impact block 22 is reset to the first axial position. The impact portion 224 strikes the force receiving portion 232, forming an impact on the rotation direction.

[0031] The basic principles, main features and advantages of the present disclosure are shown and described above. Those skilled in the art should understand that the above embodiments do not limit the present disclosure in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present disclosure.

Claims

1. An impact tool, comprising: case; The motor is housed within the casing; A rotating impact device, driven by the motor, comprises: The main shaft rotates about a first axis under the drive of the motor; Impact block, configured on the main shaft; and The anvil cooperates with the impact block and is struck by the impact block; The impact tool is characterized in that it further includes: An output shaft, configured to output torque, is connected to the anvil and rotates about a second axis under the drive of the impact block; the main shaft is disposed between the output shaft and the motor; 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, characterized in that: 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 according to claim 1, characterized in that, The housing includes: an upper housing portion having the highest point of the impact tool, wherein the distance between the highest point and the second axis is greater than or equal to 17 mm and less than or equal to 21 mm.

4. The impact tool according to claim 1, characterized in that: The impact block includes an impact portion; the anvil includes a force-receiving portion; the impact portion is configured to engage with the force-receiving portion in a drivable manner.

5. The impact tool according to claim 1, characterized in that: 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 wall; the main shaft includes a receiving part disposed on the side near the anvil.

7. The impact tool according to claim 6, characterized in that, Also includes: The first bearing is installed on the inner side wall of the housing; the second bearing is fixedly connected to the impact block and is disposed on the receiving part.

8. The impact tool according to claim 7, characterized in that: The first bearing is configured to support the impact block; 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 is configured to move axially along the first axis with the impact block.

10. An impact tool, comprising: case; The motor is housed within the housing. A rotating impact device, driven by the motor, comprises: The main shaft rotates about a first axis under the drive of the motor; Impact blocks are mounted on the main shaft; Anvil, which cooperates with and is struck by the impact block; and An output shaft, configured to output torque, is connected to the anvil and rotates about a second axis under the drive of the impact block; the main shaft is disposed between the output shaft and the motor; The output shaft is characterized by comprising: The front end face and the rear end face, the portion of the second axis located between the front end face and the rear end face is defined as the output axis segment, the output axis segment being located above the first axis.

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