Anti-stuck structure of electric hammer drill bit
By designing gear sets and impact structures, the torque and impact force of the electric hammer drill bit are increased, solving the problem of drill bit jamming and improving the reliability and service life of the electric hammer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG MINGKUN POWER TOOLS CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-24
AI Technical Summary
When using existing electric hammer drills to drill holes or break stones, the drill bit is prone to jamming, leading to overload damage to the drive unit and drill bit breakage.
The design employs a gear set and impact structure, with the gear set connecting the drive unit and the drill bit to increase the drill bit's torque and impact force, preventing jamming.
It effectively prevents drill bit jamming, protects the drive unit, extends the service life of the electric hammer, and avoids drill bit breakage.
Smart Images
Figure CN224544468U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric hammer technology, specifically to an anti-jamming structure for electric hammer drill bits. Background Technology
[0002] A hammer drill is a power tool that combines rotation and impact, primarily used for drilling holes in hard materials such as concrete, floor slabs, brick walls, and stone. It works by using a reciprocating piston to compress air within a cylinder to impact the drill bit's tail, creating a hole. It doesn't require excessive force but produces a significant impact, making it suitable for construction, renovation, and stone processing.
[0003] When drilling or breaking stones, the drill bit on the existing electric hammer is prone to jamming, which can easily overload the drive mechanism inside the hammer and damage it. Furthermore, when the drill bit is jammed, the hammer may separate from the stone, potentially causing the drill bit to break. Utility Model Content
[0004] The purpose of this utility model is to provide an anti-jamming structure for electric hammer drill bits to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a hammer drill bit anti-jamming structure, comprising:
[0006] The rear housing has a gear set inside, a front housing is provided at the front end of the rear housing, and a motor cavity is provided at the bottom of the rear housing.
[0007] The front housing has an impact structure rotatably mounted inside it, and the rear end of the outer surface of the impact structure has a first bevel tooth.
[0008] The motor cavity contains a drive device, and the output end of the drive device is provided with a first gear, which is connected to a gear set.
[0009] By adopting the above technical solution, the drive device in the motor cavity drives the first gear to rotate. Through the cooperation of the gear set, the torque of the impact structure is increased, so that the torque of the drill bit installed on the impact structure can be increased accordingly. Moreover, through the cooperation of the special-shaped parts on the gear set and the piston, the impact force is provided to the drill bit installed on the impact structure. The two work together to achieve the purpose of preventing the drill bit on the electric hammer from jamming.
[0010] Preferably, the gear set inside the rear housing includes a second gear, a third gear, and a third bevel tooth. A transmission component is provided on the top of the second gear, and a shaped component is provided on the top of the transmission component. A piston is rotatably provided at one end of the top of the shaped component. A second bevel tooth is provided on the top of the third gear, and the first and second bevel teeth mesh with each other through the third bevel tooth.
[0011] By adopting the above technical solution, the output end of the drive device drives the first gear to rotate, which in turn drives the second gear to rotate, thereby driving the transmission component to rotate. The piston moves with the transmission component, allowing the piston to slide within the impact structure and provide impact force to the drill bit installed on the impact structure.
[0012] Preferably, the first gear and the third gear both mesh with the second gear, and the rear housing is rotatably connected to the second gear, the third gear and the third bevel gear.
[0013] By adopting the above technical solution, the first gear drives the second gear to rotate, and the second gear drives the third gear to rotate. The second bevel tooth rotates with the third gear, so that the second bevel tooth can drive the third bevel tooth to rotate, and the rotation of the third bevel tooth can drive the first bevel tooth to rotate, thereby driving the impact structure to rotate within the front housing.
[0014] Preferably, a connector is provided at one end of the top of the irregular part, and a connecting hole is provided at the other end of the top of the piston. The irregular part is rotatably connected to the piston through the connector and the connecting hole.
[0015] By adopting the above technical solution, the irregular part rotates, and through the cooperation between the connecting part and the connecting hole, the piston can perform reciprocating motion.
[0016] Preferably, bearings are provided at the front end, rear end and middle positions of the outer surface of the impact structure, and the front housing is rotatably connected to the impact structure through the bearings.
[0017] By adopting the above technical solution, the impact structure can rotate smoothly in the front housing through the bearing.
[0018] Preferably, the impact structure is slidably connected to the piston, and there are two third bevel teeth, with the two third bevel teeth respectively disposed on both sides inside the rear housing.
[0019] By adopting the above technical solution, when the second bevel tooth rotates, it can drive the two third bevel teeth to rotate as well, and the two third bevel teeth simultaneously drive the first bevel tooth to rotate, thereby achieving the purpose of increasing the torque of the impact structure.
[0020] Compared with the prior art, the beneficial effects of this utility model are: the anti-jamming structure of the electric hammer drill bit is equipped with a gear set. The impact structure and the drive device are connected to the gear set through the first bevel tooth and the first gear, respectively. The gear set drives the first bevel tooth to rotate through the two third bevel teeth, thereby increasing the torque of the impact structure. Furthermore, through the cooperation of the special-shaped parts and the piston in the gear set, the drill bit installed on the impact structure has an impact force. The two cooperate with each other to prevent the drill bit on the electric hammer from jamming. Attached Figure Description
[0021] Figure 1 This is a perspective view of the present utility model;
[0022] Figure 2 This is a front view of the internal structure of this utility model;
[0023] Figure 3 This is a side view of the internal structure of this utility model;
[0024] Figure 4 This is a top view of the internal structure of this utility model;
[0025] Figure 5 This utility model Figure 2 Enlarged view of the structure at point A in the middle.
[0026] In the figure: 1. Rear housing; 2. Front housing; 3. Motor cavity; 4. Impact structure; 5. First bevel gear; 6. Drive device; 7. First gear; 8. Second gear; 9. Transmission component; 10. Irregular part; 11. Piston; 12. Third gear; 13. Second bevel gear; 14. Third bevel gear. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0028] Please see Figure 1-5This utility model provides an embodiment of an anti-jamming structure for electric hammer drill bits, comprising: a rear housing 1, a gear set disposed inside the rear housing 1, a front housing 2 disposed at the front end of the rear housing 1, and a motor cavity 3 disposed at the bottom of the rear housing 1; a front housing 2, an impact structure 4 rotatably disposed inside the front housing 2, and a first bevel tooth 5 disposed at the rear end of the outer surface of the impact structure 4; a motor cavity 3, a drive device 6 disposed inside the motor cavity 3, a first gear 7 disposed at the output end of the drive device 6, the first gear 7 being connected to the gear set, the drive device 6 in the motor cavity 3 driving the first gear 7 to rotate accordingly, and through the engagement of the gear set, increasing the torque of the impact structure 4, thereby increasing the torque of the drill bit mounted on the impact structure 4, and through the engagement of the special-shaped part 10 on the gear set and the piston 11, providing impact force to the drill bit mounted on the impact structure 4, the two working together to achieve the purpose of preventing the drill bit on the electric hammer from jamming.
[0029] In this embodiment, the gear set inside the rear housing 1 includes a second gear 8, a third gear 12, and a third bevel tooth 14. A transmission member 9 is provided on the top of the second gear 8, and a special-shaped member 10 is provided on the top of the transmission member 9. A piston 11 is rotatably provided at one end of the top of the special-shaped member 10. A second bevel tooth 13 is provided on the top of the third gear 12. The first bevel tooth 5 and the second bevel tooth 13 mesh with the third bevel tooth 14. The output end of the drive device 6 drives the first gear 7 to rotate, so that the first gear 7 can drive the second gear 8 to rotate, thereby driving the transmission member 9 to rotate. The piston 11 moves with the transmission member 9, so that the piston 11 can slide within the impact structure 4 to provide impact force for the drill bit installed on the impact structure 4.
[0030] In this embodiment, the first gear 7 and the third gear 12 are both meshed with the second gear 8. The rear housing 1 is rotatably connected to the second gear 8, the third gear 12 and the third bevel tooth 14. The first gear 7 drives the second gear 8 to rotate, and the second gear 8 can drive the third gear 12 to rotate. The second bevel tooth 13 can rotate with the third gear 12, so that the second bevel tooth 13 can drive the third bevel tooth 14 to rotate. The rotation of the third bevel tooth 14 can drive the first bevel tooth 5 to rotate, thereby driving the impact structure 4 to rotate within the front housing 2.
[0031] In this embodiment, a connector is provided at one end of the top of the irregular part 10, and a connecting hole is provided at the other end of the top of the piston 11. The irregular part 10 is rotatably connected to the piston 11 through the connector and the connecting hole. When the irregular part 10 rotates, the piston 11 can reciprocate through the cooperation between the connector and the connecting hole.
[0032] In this embodiment, bearings are provided at the front end, rear end and middle positions of the outer surface of the impact structure 4. The front housing 2 is rotatably connected to the impact structure 4 through the bearings, and the impact structure 4 can rotate smoothly in the front housing 2 through the bearings.
[0033] In this embodiment, the impact structure 4 is slidably connected to the piston 11. There are two third bevel teeth 14, and the two third bevel teeth 14 are respectively located on both sides inside the rear housing 1. When the second bevel tooth 13 rotates, it can drive the two third bevel teeth 14 to rotate as well. At the same time, the two third bevel teeth 14 drive the first bevel tooth 5 to rotate, thereby achieving the purpose of increasing the torque of the impact structure 4.
[0034] Working principle: When using the electric hammer, the user starts the drive device 6. The output end of the drive device 6 drives the first gear 7, which in turn drives the second gear 8 to rotate. This causes the transmission component 9 and the shaped component 10 to rotate with the second gear 8, and the piston 11 to reciprocate with the shaped component 10. At the same time, the second gear 8 drives the third gear 12 to rotate, which in turn drives the second bevel gear 13 to rotate. The second bevel gear 13 then drives the third bevel gear 14 to rotate, which in turn drives the impact structure 4 to rotate. The drill bit mounted on the impact structure 4 rotates accordingly. The two work together to prevent the electric hammer from jamming during operation.
[0035] For those skilled in the art, this invention is not limited to the details of the exemplary embodiments described above, and can be implemented in other specific forms without departing from the spirit or scope of this invention. Therefore, the embodiments of this invention are exemplary and not restrictive. The scope of this invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A structure for preventing jamming of an electric hammer drill bit, characterized in that, include: The rear housing (1) is provided with a gear set inside the rear housing (1), the front end of the rear housing (1) is provided with a front housing (2), and the bottom of the rear housing (1) is provided with a motor cavity (3). The front housing (2) has an impact structure (4) rotatably arranged inside the front housing (2), and a first bevel tooth (5) is provided at the rear end of the outer surface of the impact structure (4); The motor cavity (3) is provided with a drive device (6) inside the motor cavity (3). The output end of the drive device (6) is provided with a first gear (7), which is connected to a gear set.
2. The anti-jamming structure for a hammer drill bit according to claim 1, characterized in that: The gear set inside the rear housing (1) includes a second gear (8), a third gear (12) and a third bevel gear (14). A transmission component (9) is provided on the top of the second gear (8), and a shaped component (10) is provided on the top of the transmission component (9). A piston (11) is rotatably provided on one end of the top of the shaped component (10). A second bevel gear (13) is provided on the top of the third gear (12). The first bevel gear (5) and the second bevel gear (13) mesh with each other through the third bevel gear (14).
3. The anti-jamming structure for a hammer drill bit according to claim 2, characterized in that: The first gear (7) and the third gear (12) are both meshed with the second gear (8), and the rear housing (1) is rotatably connected to the second gear (8), the third gear (12) and the third bevel gear (14).
4. The anti-jamming structure for a hammer drill bit according to claim 2, characterized in that: One end of the top of the irregular part (10) is provided with a connector, and the other end of the top of the piston (11) is provided with a connecting hole. The irregular part (10) is rotatably connected to the piston (11) through the connector and the connecting hole.
5. The anti-jamming structure for a hammer drill bit according to claim 2, characterized in that: Bearings are provided at the front end, rear end and middle position of the outer surface of the impact structure (4), and the front housing (2) is rotatably connected to the impact structure (4) through the bearings.
6. The anti-jamming structure for a hammer drill bit according to claim 2, characterized in that: The impact structure (4) is slidably connected to the piston (11), and there are two third bevel teeth (14), which are respectively located on both sides inside the rear housing (1).