An impact structure for power tools

Abstract

This invention discloses an impact structure for power tools, comprising a drive shaft, an impact disc, an output shaft, and an impact spring. The impact disc contains two symmetrical first inclined surfaces with a "V"-shaped cross-section. A through hole is provided on the upper part of the drive shaft, with its axis perpendicular to the drive shaft's axis. A pin is placed within the through hole, with both ends extending out of the hole. The drive shaft is inserted into the impact disc, and the two ends of the pin press against the upper surfaces of the two first inclined surfaces. The output shaft has a first impact block, and a second impact block is circumferentially arranged on the upper surface of the impact disc. One end of the impact spring extends into the inner cavity of the impact disc, and the other end abuts against a limiting step on the drive shaft. This invention not only reduces manufacturing costs and saves time, enabling rapid mass production, but also improves the drive shaft's strength and yield rate by eliminating the "V"-shaped groove feature.

Description

Technical Field

[0001] This invention relates to the field of electric screwdrivers and electric wrenches, and more particularly to an impact structure for power tools. Background Technology

[0002] Screwdrivers and electric wrenches are common handheld tools, and there are many different types. See Figure 1 An existing electric screwdriver or electric wrench with an impact structure has the following main components: a drive shaft 101, an impact disc 102, an output shaft 103, and an impact spring 104. The drive shaft 101 has symmetrically arranged V-shaped grooves 1012 on both sides of its middle section. The inner wall of the impact disc 102 has symmetrically arranged protrusions (not shown in the figure) that mate with the grooves 1012. A first impact block 1031 is arranged circumferentially at one end of the output shaft 103, and a second impact block 1021 is arranged circumferentially on the upper surface of the impact disc 102. Its working principle is as follows: the impact disc 102 is connected to the drive shaft 101 via steel balls 105. When the drive shaft 101 rotates, the steel balls 105 drive the impact disc 102 to rotate. The second impact block 1021 on the impact disc 102 strikes the first impact block 1031 on the output shaft 103, achieving one impact. As the drive shaft 101 continues to rotate, the impact disc 102 moves downward along the "V"-shaped inclined groove 1012 of the drive shaft 101. When the upper end face of the second impact block 1021 disengages from the lower end face of the output shaft 103, the impact disc 102 immediately resets under the action of the impact spring 104 and performs the next impact.

[0003] In the above structure, the manufacturing process is complicated and the manufacturing cost is high because the inclined grooves 1012 need to be opened on both sides of the middle part of the transmission shaft 101. Moreover, after the inclined grooves 1012 are opened on both sides of the transmission shaft 101, the strength of the transmission shaft 101 will decrease and the service life of the transmission shaft 101 will be affected. Summary of the Invention

[0004] The main objective of this invention is to overcome the shortcomings of the prior art and provide an impact structure for power tools.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An impact structure for power tools includes a drive shaft, an impact disc, an output shaft, and an impact spring. The impact disc has two symmetrical first inclined surfaces with a "V"-shaped cross-section. The drive shaft has a through hole at its upper part, the axis of which is perpendicular to the axis of the drive shaft. A pin is placed inside the through hole, with both ends extending out of the two sides of the through hole. The drive shaft is inserted into the impact disc, and both ends of the pin press against the upper surfaces of the two first inclined surfaces. A first impact block is circumferentially located at one end of the output shaft near the impact disc, and a second impact block is circumferentially located on the upper surface of the impact disc. One end of the impact spring extends into the inner cavity of the impact disc, and the other end abuts against a limiting step on the drive shaft.

[0007] The planes containing the two first inclined planes each form an acute angle with the horizontal plane.

[0008] The two ends of the pin are set as arc-shaped surfaces.

[0009] The two ends of the pin are set as hemispherical surfaces.

[0010] The impact disc is provided with a through hole for the transmission shaft to pass through. The upper half of the through hole is provided with a central hole coaxial with the through hole. The diameter of the central hole is larger than the diameter of the through hole. Two second inclined planes are symmetrically arranged in the annular groove formed by the central hole and the through hole.

[0011] The impact plate has a positioning groove on the outside of the through hole, which is coaxial with the through hole. The inner diameter of the positioning groove is larger than the diameter of the through hole, and one end of the impact spring extends into the positioning groove.

[0012] At the bottom of the positioning groove, a ring of steel balls is arranged around the outer circumferential wall of the through hole. A first washer is arranged between the steel balls and the upper end of the impact spring, and the first washer is sleeved on the outer circumferential wall of the through hole.

[0013] A second washer is provided between the limiting step of the drive shaft and the lower end of the impact spring, and the second washer is sleeved on the drive shaft.

[0014] Compared with the prior art, the beneficial effects of one structure of the present invention are as follows:

[0015] Because this invention uses a through hole on the drive shaft and a pin inside the through hole, it not only reduces manufacturing costs and saves time, enabling rapid mass production, but also improves the strength of the drive shaft and increases the yield rate of drive shaft production by eliminating the "V" groove feature on the drive shaft.

[0016] The present invention also provides another impact structure for power tools, including a drive shaft, an impact disc, an output shaft, and an impact spring. The impact disc has two symmetrical first inclined surfaces, each with a "V"-shaped cross-section. The drive shaft has a through hole at its upper part, the axis of which is perpendicular to the axis of the drive shaft. Two cylindrical pins are disposed within the through hole, their ends extending out from opposite sides of the hole. The drive shaft is inserted into the impact disc, with one end of one cylindrical pin pressing against the upper surface of one of the first inclined surfaces, and the other end pressing against the upper surface of the other first inclined surface. A first impact block is disposed circumferentially at one end of the output shaft near the impact disc, and a second impact block is disposed circumferentially on the upper surface of the impact disc. One end of the impact spring extends into the inner cavity of the impact disc, and the other end abuts against a limiting step of the drive shaft.

[0017] Both of the cylindrical pins have outward-facing end faces that are hemispherical.

[0018] The impact disc is provided with a through hole for the transmission shaft to pass through. The upper half of the through hole is provided with a central hole coaxial with the through hole. The diameter of the central hole is larger than the diameter of the through hole. The two first inclined planes are symmetrically arranged in the annular groove formed by the central hole and the through hole.

[0019] The impact plate has a positioning groove on the outside of the through hole, which is coaxial with the through hole. The inner diameter of the positioning groove is larger than the diameter of the through hole, and one end of the impact spring extends into the positioning groove.

[0020] At the bottom of the positioning groove, a ring of steel balls is arranged around the outer circumferential wall of the through hole. A first washer is arranged between the steel balls and the upper end of the impact spring, and the first washer is sleeved on the outer circumferential wall of the through hole.

[0021] A second washer is provided between the limiting step of the drive shaft and the lower end of the impact spring, and the second washer is sleeved on the drive shaft.

[0022] Compared with the prior art, the beneficial effects of another structure of the present invention are as follows:

[0023] Because this invention uses a through hole on the drive shaft and two cylindrical pins inside the through hole, it not only reduces manufacturing costs and saves time, enabling rapid mass production, but also extends the service life of the cylindrical pins because the two cylindrical pins rotate in opposite directions and do not interfere with each other during actual operation. Furthermore, by eliminating the "V" groove feature on the drive shaft, the strength of the drive shaft is improved, as is the yield rate of drive shaft production.

[0024] The present invention also provides another impact structure for power tools, including a drive shaft, an impact disc, an output shaft, and an impact spring. The impact disc has two symmetrical first inclined surfaces with a "V" shaped cross-section. The drive shaft has two recessed holes on its upper part, which are symmetrically arranged along the circumference of the drive shaft. Each recessed hole is provided with a ball bearing. The drive shaft is inserted into the impact disc, with one ball bearing pressing against the upper surface of one of the first inclined surfaces and the other ball bearing against the upper surface of the other first inclined surface. The output shaft has a first impact block arranged circumferentially at one end near the impact disc, and a second impact block arranged circumferentially on the upper surface of the impact disc. One end of the impact spring extends into the inner cavity of the impact disc, and the other end abuts against the limiting step of the drive shaft.

[0025] The planes containing the two first inclined planes each form an acute angle with the horizontal plane.

[0026] The impact disc is provided with a through hole for the transmission shaft to pass through. The upper half of the through hole is provided with a central hole coaxial with the through hole. The diameter of the central hole is larger than the diameter of the through hole. The two first inclined planes are symmetrically arranged in the annular groove formed by the central hole and the through hole.

[0027] The impact plate has a positioning groove on the outside of the through hole, which is coaxial with the through hole. The inner diameter of the positioning groove is larger than the diameter of the through hole, and one end of the impact spring extends into the positioning groove.

[0028] At the bottom of the positioning groove, a ring of steel balls is arranged around the outer circumferential wall of the through hole. A first washer is arranged between the steel balls and the upper end of the impact spring, and the first washer is sleeved on the outer circumferential wall of the through hole.

[0029] Compared with the prior art, the beneficial effects of another structure of the present invention are as follows:

[0030] Because this invention uses two recessed holes on the drive shaft, each containing a ball bearing, it not only reduces manufacturing costs and saves time, enabling rapid mass production, but also ensures that the two balls rotate in opposite directions during operation, preventing interference and extending their service life. Furthermore, by eliminating the "V" groove feature on the drive shaft, the strength of the drive shaft is improved, as is the yield rate of drive shaft production. Attached Figure Description

[0031] Figure 1 This is an exploded view of an existing impact structure;

[0032] Figure 2 It is a structural schematic diagram of the present invention;

[0033] Figure 3 This is a schematic diagram of the impact disc of the present invention;

[0034] Figure 4 This is a cross-sectional view of Embodiment 1 of the present invention;

[0035] Figure 5 This is an exploded view of Embodiment 1 of the present invention;

[0036] Figure 6 This is a cross-sectional view of Embodiment 2 of the present invention;

[0037] Figure 7 This is an exploded view of Embodiment 2 of the present invention;

[0038] Figure 8 This is a cross-sectional view of Embodiment 3 of the present invention;

[0039] Figure 9 This is an exploded view of Embodiment 3 of the present invention. Detailed Implementation

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See Figures 2 to 5 This is Embodiment 1 of the present invention, an impact structure for power tools, including a drive shaft 1, an impact disk 2, an output shaft 4, and an impact spring 5. The impact disk 2 has two symmetrical first inclined surfaces 21, the cross-section of which is "V" shaped. The upper part of the drive shaft 1 has a through hole 11, the axis of which is perpendicular to the axis of the drive shaft 1. A pin 3 is provided in the through hole 11, with both ends of the pin 3 extending out of both sides of the through hole 11. The drive shaft 1 is inserted into the impact disk 2, and both ends of the pin 3 press against the upper surfaces of the two first inclined surfaces 21 respectively. The output shaft 4 has a first impact block 41 arranged circumferentially at one end near the impact disk 2, and a second impact block 22 arranged circumferentially on the upper surface of the impact disk 2. One end of the impact spring 5 extends into the inner cavity of the impact disk 2, and the other end abuts against the limiting step of the drive shaft 1.

[0042] Preferably, the planes containing the two first inclined planes 21 form acute angles with the horizontal plane.

[0043] Preferably, the two ends of the pin 3 are set as arc-shaped surfaces, and more ideally, the two ends of the pin 3 are set as hemispherical surfaces.

[0044] The impact plate 2 is provided with a through hole 23 for the transmission shaft 1 to pass through. The upper half of the through hole 23 is provided with a central hole 24 coaxial with the through hole 23. The diameter of the central hole 24 is larger than the diameter of the through hole 23. Two first inclined surfaces 21 are symmetrically arranged in the annular groove formed by the central hole 24 and the through hole 23.

[0045] The impact plate 2 has a positioning groove 25 on the outside of the through hole 23, which is coaxial with the through hole 23. The inner diameter of the positioning groove 25 is larger than the diameter of the through hole 23, and one end of the impact spring 5 extends into the positioning groove 25.

[0046] At the bottom of the positioning groove 25, a ring of steel balls 7 is arranged around the outer circumferential wall of the through hole 23. A first washer 8 is arranged between the steel balls 7 and the upper end of the impact spring 5. The first washer 8 is sleeved on the outer circumferential wall of the through hole 23.

[0047] A second washer 9 is provided between the limiting step of the drive shaft 1 and the lower end of the impact spring 5, and the second washer 9 is sleeved on the drive shaft 1.

[0048] The working principle of Embodiment 1 of the present invention: The transmission shaft 1 drives the impact disk 2 to rotate via the pin 3. The impact disk 2 drives the output shaft 4 to rotate via two second impact blocks 22. The two ends of the pin 3 between the transmission shaft 1 and the impact disk 2 are located in two first inclined surfaces 21. As the output torque increases, the two ends of the pin 3 will slide on the surfaces of the two first inclined surfaces 21, thereby forcing the impact disk 2 to move downward. When the upper end of the second impact block 22 disengages from the lower end of the first impact block 41, the impact disk 2 returns to its original position under the action of the impact spring 5. The second impact block 22 will strike the first impact block 41 again, achieving another impact. Afterward, the two ends of the pin 3 engage with the first inclined surface 21 of the impact disk 2 again, causing the impact disk 2 to move downward. This cycle repeats, and the impact disk 2 strikes the first impact block 41 of the output shaft 4 after a certain interval, causing the output shaft 4 to rotate intermittently.

[0049] See Figure 2 , Figure 3 , Figure 6 and Figure 7This is Embodiment 2 of the present invention, an impact structure for power tools, including a drive shaft 1, an impact disk 2, an output shaft 4, and an impact spring 5. The impact disk 2 has two symmetrical first inclined surfaces 21, the cross-section of which is "V" shaped. The upper part of the drive shaft 1 has a through hole 11, the axis of which is perpendicular to the axis of the drive shaft 1. Two cylindrical pins 30 are provided in the through hole 11, the ends of which extend out of the two sides of the through hole 11 respectively. The drive shaft 1 is inserted into the impact disk 2, the end of one cylindrical pin 30 abuts against the upper surface of one of the first inclined surfaces 21, and the end of the other cylindrical pin 30 abuts against the upper surface of the other first inclined surface 21. The output shaft 4 has a first impact block 41 arranged circumferentially at one end near the impact disk 2, and a second impact block 22 arranged circumferentially on the upper end surface of the impact disk 2. One end of the impact spring 5 extends into the inner cavity of the impact disk 2, and the other end abuts against the limiting step of the drive shaft 1.

[0050] Preferably, the planes containing the two first inclined planes 21 form acute angles with the horizontal plane.

[0051] Preferably, the outward-facing end faces of the two cylindrical pins 30 are both set as hemispherical surfaces.

[0052] The impact plate 2 is provided with a through hole 23 for the transmission shaft 1 to pass through. The upper half of the through hole 23 is provided with a central hole 24 coaxial with the through hole 23. The diameter of the central hole 24 is larger than the diameter of the through hole 23. Two first inclined surfaces 21 are symmetrically arranged in the annular groove formed by the central hole 24 and the through hole 23.

[0053] The impact plate 2 has a positioning groove 25 on the outside of the through hole 23, which is coaxial with the through hole 23. The inner diameter of the positioning groove 25 is larger than the diameter of the through hole 23, and one end of the impact spring 5 extends into the positioning groove 25.

[0054] At the bottom of the positioning groove 25, a ring of steel balls 7 is arranged around the outer circumferential wall of the through hole 23. A first washer 8 is arranged between the steel balls 7 and the upper end of the impact spring 5. The first washer 8 is sleeved on the outer circumferential wall of the through hole 23.

[0055] A second washer 9 is provided between the limiting step of the drive shaft 1 and the lower end of the impact spring 5, and the second washer 9 is sleeved on the drive shaft 1.

[0056] The working principle of Embodiment 2 of the present invention: The transmission shaft 1 drives the impact disk 2 to rotate through two cylindrical pins 30. The impact disk 2 drives the output shaft 4 to rotate through two second impact blocks 22. The end faces of the two cylindrical pins 30 between the transmission shaft 1 and the impact disk 2 correspond one-to-one with the two first inclined surfaces 21. As the output torque increases, each cylindrical pin 30 slides on the corresponding first inclined surface 21, thereby forcing the impact disk 2 to move downward. When the upper end face of the second impact block 22 disengages from the lower end face of the first impact block 41, the impact disk 2 resets upward under the action of the impact spring 5. The second impact block 22 will strike the first impact block 41 again, achieving another impact. Afterward, the two cylindrical pins 30 cooperate with the two first inclined surfaces 21 of the impact disk 2 again, causing the impact disk 2 to move downward. This cycle repeats, and the impact disk 2 strikes the first impact block 41 of the output shaft 4 after a certain interval, causing the output shaft 4 to rotate intermittently.

[0057] See Figure 2 , Figure 3 , Figure 8 and Figure 9 This is Embodiment 3 of the present invention, an impact structure for power tools, including a drive shaft 1, an impact disk 2, an output shaft 4, and an impact spring 5. The impact disk 2 has two symmetrical first inclined surfaces 21, the cross-section of which is "V" shaped. The upper part of the drive shaft 1 has two recessed holes 40, which are symmetrically arranged along the circumference of the drive shaft 1. Each recessed hole 40 is provided with a ball bearing 50. The drive shaft 1 is inserted into the impact disk 5, one ball bearing 50 abuts against the upper surface of one of the first inclined surfaces 21, and the other ball bearing 50 abuts against the upper surface of the other first inclined surface 21. The output shaft 4 has a first impact block 41 arranged along the circumference at one end near the impact disk 2, and a second impact block 22 arranged along the circumference at the upper end surface of the impact disk 2. One end of the impact spring 5 extends into the inner cavity of the impact disk 2, and the other end abuts against the limiting step of the drive shaft 1.

[0058] Preferably, the planes containing the two first inclined planes 21 form acute angles with the horizontal plane.

[0059] The impact plate 2 is provided with a through hole 23 for the transmission shaft 1 to pass through. The upper half of the through hole 23 is provided with a central hole 24 coaxial with the through hole 23. The diameter of the central hole 24 is larger than the diameter of the through hole 23. Two first inclined surfaces 21 are symmetrically arranged in the annular groove formed by the central hole 24 and the through hole 23.

[0060] The impact plate 2 has a positioning groove 25 on the outside of the through hole 23, which is coaxial with the through hole 23. The inner diameter of the positioning groove 25 is larger than the diameter of the through hole 23, and one end of the impact spring 5 extends into the positioning groove 25.

[0061] At the bottom of the positioning groove 25, a ring of steel balls 7 is arranged around the outer circumferential wall of the through hole 23. A first washer 8 is arranged between the steel balls 7 and the upper end of the impact spring 5. The first washer 8 is sleeved on the outer circumferential wall of the through hole 23.

[0062] A second washer 9 is provided between the limiting step of the drive shaft 1 and the lower end of the impact spring 5, and the second washer 9 is sleeved on the drive shaft 1.

[0063] The working principle of Embodiment 3 of the present invention: The transmission shaft 1 drives the impact disk 2 to rotate via two ball bearings 50. The impact disk 2 drives the output shaft 4 to rotate via two second impact blocks 22. The two ball bearings 50 between the transmission shaft 1 and the impact disk 2 correspond one-to-one with the two first inclined surfaces 21. As the output torque increases, each ball bearing 50 slides on the corresponding surface of the first inclined surface 21, thereby forcing the impact disk 2 to move downward. When the upper end face of the second impact block 22 disengages from the lower end face of the first impact block 41, the impact disk 2 returns to its original position under the action of the impact spring 5. The second impact block 22 will then strike the first impact block 41 again, achieving another impact. Afterward, the two ball bearings 50 cooperate with the two first inclined surfaces 21 of the impact disk 2 again, causing the impact disk 2 to move downward. This cycle repeats, and the impact disk 2 strikes the first impact block 41 of the output shaft 4 after a certain interval, causing the output shaft 4 to rotate intermittently.

[0064] The above detailed description pertains to specific embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent of the present invention. All equivalent implementations or modifications that do not depart from the spirit of the present invention should be included within the protection scope of the present invention.

Claims

1. An impact structure for power tools, comprising a drive shaft, an impact disc, an output shaft, and an impact spring, characterized in that: The impact disc has two symmetrical first inclined surfaces, the cross-section of which is "V" shaped. The upper part of the drive shaft has a through hole, the axis of which is perpendicular to the axis of the drive shaft. A pin is installed in the through hole, with both ends of the pin extending out of the two sides of the through hole. The drive shaft is inserted into the impact disc, and both ends of the pin press against the upper surfaces of the two first inclined surfaces respectively. A first impact block is provided circumferentially at one end of the output shaft near the impact disc, and a second impact block is provided circumferentially on the upper surface of the impact disc. One end of the impact spring extends into the inner cavity of the impact disc, and the other end abuts against the limiting step of the transmission shaft.

2. The impact structure for power tools according to claim 1, characterized in that: The planes containing the two first inclined planes each make an acute angle with the horizontal plane.

3. The impact structure for power tools according to claim 1, characterized in that: The two ends of the pin are set as arc-shaped surfaces.

4. The impact structure for power tools according to claim 2, characterized in that: The two ends of the pin are set as hemispherical surfaces.

5. The impact structure for power tools according to claim 1, characterized in that: The impact disc is provided with a through hole for the transmission shaft to pass through. The upper half of the through hole is provided with a central hole coaxial with the through hole. The diameter of the central hole is larger than the diameter of the through hole. The two first inclined planes are symmetrically arranged in the annular groove formed by the central hole and the through hole.

6. The impact structure for power tools according to claim 5, characterized in that: The impact plate has a positioning groove on the outside of the through hole, which is coaxial with the through hole. The inner diameter of the positioning groove is larger than the diameter of the through hole, and one end of the impact spring extends into the positioning groove.

7. The impact structure for power tools according to claim 6, characterized in that: At the bottom of the positioning groove, a ring of steel balls is arranged around the outer circumferential wall of the through hole. A first washer is arranged between the steel balls and the upper end of the impact spring, and the first washer is sleeved on the outer circumferential wall of the through hole.

8. The impact structure for power tools according to claim 1, characterized in that: A second washer is provided between the limiting step of the drive shaft and the lower end of the impact spring, and the second washer is sleeved on the drive shaft.

9. An impact structure for power tools, comprising a drive shaft, an impact disc, an output shaft, and an impact spring, characterized in that: The impact disc has two symmetrical first inclined surfaces with a "V" shaped cross-section. The upper part of the drive shaft has a through hole with its axis perpendicular to the axis of the drive shaft. Two cylindrical pins are installed in the through hole, with their ends extending out of the two sides of the through hole. The drive shaft is inserted into the impact disc, with one end of the cylindrical pin pressing against the upper surface of one of the first inclined surfaces and the other end of the cylindrical pin pressing against the upper surface of the other first inclined surface. A first impact block is provided circumferentially at one end of the output shaft near the impact disc, and a second impact block is provided circumferentially on the upper surface of the impact disc. One end of the impact spring extends into the inner cavity of the impact disc, and the other end abuts against the limiting step of the drive shaft.

10. The impact structure for power tools according to claim 9, characterized in that: The planes containing the two first inclined planes each make an acute angle with the horizontal plane.

11. The impact structure for power tools according to claim 9, characterized in that: Both of the cylindrical pins have outward-facing end faces that are hemispherical.

12. The impact structure for power tools according to claim 9, characterized in that: The impact disc is provided with a through hole for the transmission shaft to pass through. The upper half of the through hole is provided with a central hole coaxial with the through hole. The diameter of the central hole is larger than the diameter of the through hole. The two first inclined planes are symmetrically arranged in the annular groove formed by the central hole and the through hole.

13. The impact structure for power tools according to claim 12, characterized in that: The impact plate has a positioning groove on the outside of the through hole, which is coaxial with the through hole. The inner diameter of the positioning groove is larger than the diameter of the through hole, and one end of the impact spring extends into the positioning groove.

14. The impact structure for power tools according to claim 13, characterized in that: At the bottom of the positioning groove, a ring of steel balls is arranged around the outer circumferential wall of the through hole. A first washer is arranged between the steel balls and the upper end of the impact spring, and the first washer is sleeved on the outer circumferential wall of the through hole.

15. The impact structure for power tools according to claim 9, characterized in that: A second washer is provided between the limiting step of the drive shaft and the lower end of the impact spring, and the second washer is sleeved on the drive shaft.

16. An impact structure for power tools, comprising a drive shaft, an impact disc, an output shaft, and an impact spring, characterized in that: The impact disc has two symmetrical first inclined surfaces with a "V" shaped cross-section. The upper part of the drive shaft has two recessed holes symmetrically arranged along the circumference of the drive shaft. Each recessed hole is equipped with a ball bearing. The drive shaft is inserted into the impact disc, with one ball bearing pressing against the upper surface of one of the first inclined surfaces and the other ball bearing pressing against the upper surface of the other first inclined surface. The output shaft has a first impact block arranged circumferentially at one end near the impact disc, and a second impact block arranged circumferentially on the upper surface of the impact disc. One end of the impact spring extends into the inner cavity of the impact disc, and the other end abuts against the limiting step of the drive shaft.

17. The impact structure for power tools according to claim 16, characterized in that: The planes containing the two first inclined planes each make an acute angle with the horizontal plane.

18. The impact structure for power tools according to claim 16, characterized in that: The impact disc is provided with a through hole for the transmission shaft to pass through. The upper half of the through hole is provided with a central hole coaxial with the through hole. The diameter of the central hole is larger than the diameter of the through hole. The two first inclined planes are symmetrically arranged in the annular groove formed by the central hole and the through hole.

19. The impact structure for power tools according to claim 18, characterized in that: The impact plate has a positioning groove on the outside of the through hole, which is coaxial with the through hole. The inner diameter of the positioning groove is larger than the diameter of the through hole, and one end of the impact spring extends into the positioning groove.

20. The impact structure for power tools according to claim 19, characterized in that: At the bottom of the positioning groove, a ring of steel balls is arranged around the outer circumferential wall of the through hole. A first washer is arranged between the steel balls and the upper end of the impact spring, and the first washer is sleeved on the outer circumferential wall of the through hole.

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