A brushless motor driven pistol drill

Abstract

This invention relates to the field of handheld gun drill technology and discloses a brushless motor-driven handheld gun drill, comprising a housing, a brushless motor fixedly connected to the inner wall of the housing, and drive teeth rotatably connected to the inner wall of the housing via bearings. A buffer mechanism is provided inside the housing, the buffer mechanism including a drive rod. The outer wall of the drive rod near the drive teeth is fixedly connected to the inner wall of the drive teeth. A hinge plate is hinged to the outer wall of the drive rod via a rotating shaft. The other end of the hinge plate is fixedly connected to the outer wall of a connecting rod via a rotating shaft. An elastic push rod is fixedly connected to the inner wall of the drive rod, and the other end of the elastic push rod is fixedly connected to the inner wall of the connecting rod. This invention, by setting up a buffer mechanism, discharges the reverse torsional force generated during drilling, preventing the brushless motor from overheating due to increased instantaneous resistance, thus increasing the stability of the handheld gun drill during operation.

Description

Technical Field

[0001] This invention relates to the field of handheld gun drill technology, specifically a brushless motor driven handgun drill. Background Technology

[0002] A brushless motor-driven pistol drill is a handheld drilling tool based on brushless motor technology, used for drilling materials and meeting the drilling needs of various environments for flexible operation.

[0003] Patent application CN202322906338.0 discloses a rechargeable lithium-ion brushless electric drill, including a housing with a heat dissipation vent, a motor disposed inside the housing, a drive shaft connected to the motor, and a heat dissipation structure disposed on the housing. The heat dissipation structure includes a cooling pipe disposed inside the housing with its two ends located inside and outside the housing, respectively, and a drive structure disposed on the end of the cooling pipe located inside the housing to drive cold air from outside the housing into the housing through the cooling pipe. The opening and closing of the drive structure is controlled by the rotation or stationary position of the drive shaft.

[0004] However, during the drilling process, the brushless motor driven pistol drill will heat up rapidly under load resistance due to the high speed characteristics of the brushless motor, which will cause the output torque of the motor to decrease, affecting the drilling efficiency. Long-term overheating will reduce the service life of the motor. Summary of the Invention

[0005] The purpose of this invention is to provide a brushless motor driven pistol drill to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a brushless motor driven pistol drill, comprising a housing, a brushless motor fixedly connected to the inner wall of the housing, drive teeth rotatably connected to the inner wall of the housing via bearings, and a buffer mechanism provided inside the housing;

[0007] The buffer mechanism includes a drive rod, the outer wall of which is fixedly connected to the inner wall of the drive tooth on the side closest to the drive tooth, a hinge plate is hinged to the outer wall of the drive rod via a rotating shaft, and a connecting rod is hinged to the other end of the hinge plate via a rotating shaft. An elastic push rod is fixedly connected to the inner wall of the drive rod, and the other end of the elastic push rod is fixedly connected to the inner wall of the connecting rod. The elastic push rod is used to support the connecting rod. The hinge plate is used to transmit driving force and is elastic to dissipate the torsional force generated between the connecting rod and the drive rod.

[0008] According to the above technical solution, the output end of the brushless motor is connected to the outer wall of the drive tooth through meshing. The brushless motor is used to drive the drive tooth to rotate inside the housing. The outer wall of the drive rod is rotatably connected to the inner wall of the housing through a bearing. A chuck is fixedly connected to the end of the connecting rod away from the drive rod. The chuck is used to clamp the drill bit. A support platform is fixedly connected to the outer wall of the connecting rod. The outer wall of the support platform is slidably connected to the inner wall of the housing. The housing is used to guide and support the connecting rod.

[0009] According to the above technical solution, an air inlet is provided on the outer wall of the housing, and the position of the air inlet matches the position of the brushless motor. An exhaust port is provided on the outer wall of the housing, and an exhaust fan is provided at the output end of the brushless motor so that the interior of the housing forms a flow channel through the air inlet and the exhaust port.

[0010] According to the above technical solution, the inner wall of the housing is provided with a connection hole, and the outer wall of the housing is fixedly connected with a jet hole. The jet hole communicates with the inside of the housing, and a one-way valve is provided inside the jet hole to allow the jet hole to jet air towards the chuck.

[0011] According to the above technical solution, an impact mechanism is provided inside the housing. The impact mechanism includes a limiting sleeve, the outer wall of which is fixedly connected to the inner wall of the housing. The inner wall of the limiting sleeve is rotatably connected to the outer wall of the drive rod through a bearing. An impact block is slidably connected to the inner wall of the limiting sleeve. A spline groove is provided on the inner wall of the limiting sleeve. The outer wall of the impact block is inserted into the inner wall of the spline groove through a spline. The spline groove is used to restrict the rotation of the impact block.

[0012] According to the above technical solution, the inner wall of the impact block slides along the outer wall of the connecting rod, the impact block is used to guide the connecting rod, the connecting rod rotates on the inner wall of the impact block, a circulation groove is provided on the inner wall of the impact block, a limit block is fixedly connected to the outer wall of the connecting rod, the limit block slides along the groove wall of the circulation groove, the connecting rod slides in the circulation groove through the limit block during rotation, causing the impact block to slide on the outer wall of the connecting rod, and the impact block contacts the outer wall of the support platform during the sliding process of the outer wall of the connecting rod, striking the support platform.

[0013] According to the above technical solution, a baffle is fixedly connected to the outer wall of the impact block, and a support sleeve is slidably connected to the outer wall of the limiting sleeve. One end of the support sleeve near the baffle contacts the outer wall of the baffle, and the support sleeve is used to support the baffle. A support spring is fixedly connected to the outer wall of the support sleeve, and the other end of the support spring is fixedly connected to the outer wall of the limiting sleeve. The support spring is used to support the baffle through the support sleeve.

[0014] According to the above technical solution, the outer wall of the baffle slides along the inner wall of the housing through the sealing ring, and a one-way valve is provided inside the baffle to draw air from the side of the baffle away from the jet hole to the cavity on the side closer to the jet hole. The inner wall of the impact block slides along the outer wall of the hinge plate to limit the hinge plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention uses a buffer mechanism to release the reverse torsional force generated during drilling, preventing the brushless motor from overheating rapidly due to increased instantaneous resistance, ensuring the stability of the brushless motor's torque output, and increasing the stability of the handheld gun drill during operation.

[0017] 2. The present invention uses a buffer mechanism to drive the drill bit to retract when it encounters significant resistance, thereby reducing the depth of cut and preventing the drill bit from overheating due to increased load torque on the brushless motor caused by excessive depth of cut. This ensures the stability of the output torque of the brushless motor and increases the stability of the handheld gun drill during drilling.

[0018] 3. The present invention improves the drilling efficiency of the handheld gun drill by setting the impact mechanism and the buffer mechanism to work together to impact the hole. At the same time, the buffer mechanism dissipates the impact vibration, reduces the vibration force transmitted to the gripping part, and increases the operational stability of the handheld gun drill.

[0019] 4. This invention uses an impact mechanism to extract air from inside the extraction housing, increasing the airflow into the heat dissipation area of ​​the brushless motor and improving the heat dissipation efficiency of the brushless motor. At the same time, the extracted air is discharged from the jet hole to clean up the drill chips, preventing the chips from affecting the drilling accuracy and drill bit life, and increasing the stability of the handheld gun drill during operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 Cross-sectional view of the present invention Figure 1 ;

[0022] Figure 3 Cross-sectional view of the present invention Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the impact mechanism of the present invention;

[0024] Figure 5 A cross-sectional view of the impact mechanism of the present invention. Figure 1 ;

[0025] Figure 6A cross-sectional view of the impact mechanism of the present invention. Figure 2 ;

[0026] Figure 7 This is a schematic diagram of the buffer mechanism of the present invention. Figure 1 ;

[0027] Figure 8 This is a schematic diagram of the buffer mechanism of the present invention. Figure 2 ;

[0028] Figure 9 For the present invention Figure 8 Enlarged diagram of point A in the middle.

[0029] In the diagram: 100, housing; 101, chuck; 102, air inlet; 103, air outlet; 104, brushless motor; 105, drive gear; 106, connecting hole; 107, jet nozzle; 200, impact mechanism; 201, impact block; 202, baffle; 203, support spring; 204, limit sleeve; 205, support sleeve; 206, spline groove; 207, circulation groove; 300, buffer mechanism; 301, connecting rod; 302, drive rod; 303, hinge plate; 304, support platform; 305, elastic push rod; 306, limit block. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1, please refer to Figures 1-3 and Figures 7-9 The present invention provides a technical solution: a brushless motor driven pistol drill, including a housing 100, a brushless motor 104 fixedly connected to the inner wall of the housing 100, a drive gear 105 rotatably connected to the inner wall of the housing 100 through a bearing, and a buffer mechanism 300 provided inside the housing 100.

[0032] During drilling, the high-speed characteristics of the brushless motor 104 cause it to heat up rapidly under load resistance, leading to a decrease in the motor's output torque and affecting drilling efficiency. Prolonged overheating can also reduce the motor's lifespan. Therefore, a buffer mechanism 300 is installed to dissipate the reverse torsional force generated during drilling, preventing the brushless motor 104 from overheating rapidly due to increased instantaneous resistance. This ensures the stability of the brushless motor 104's torque output and increases the stability of the handheld gun drill during operation. Simultaneously, when the drill bit encounters significant resistance, the buffer mechanism 300 causes the drill bit to retract, reducing its depth of cut and preventing excessive depth of cut from increasing the load torque on the brushless motor 104 and causing it to overheat. This further ensures the stability of the brushless motor 104's output torque and increases the stability of the handheld gun drill during drilling.

[0033] The buffer mechanism 300 includes a drive rod 302. The outer wall of the drive rod 302 near the drive tooth 105 is fixedly connected to the inner wall of the drive tooth 105. A hinge plate 303 is hinged to the outer wall of the drive rod 302 via a rotating shaft. A connecting rod 301 is hinged to the other end of the hinge plate 303 via a rotating shaft. An elastic push rod 305 is fixedly connected to the inner wall of the drive rod 302. The other end of the elastic push rod 305 is fixedly connected to the inner wall of the connecting rod 301. The elastic push rod 305 is used to support the connecting rod 301. The hinge plate 303 is used to transmit driving force. The hinge plate 303 is elastic and is used to dissipate the torsional force generated between the connecting rod 301 and the drive rod 302. The output end of the brushless motor 104 is connected to the outer wall of the drive tooth 105 through meshing. The brushless motor 104 is used to drive the drive tooth 105 to rotate inside the housing 100. The outer wall of the drive rod 302 rotates with the inner wall of the housing 100 through a bearing. The connecting rod 301 is fixedly connected to a chuck 101 at the end away from the drive rod 302. The chuck 101 is used to clamp the drill bit. A support platform 304 is fixedly connected to the outer wall of the connecting rod 301. The outer wall of the support platform 304 is slidably connected to the inner wall of the housing 100. The housing 100 is used to guide and support the connecting rod 301. An air inlet 102 is opened on the outer wall of the housing 100. The position of the air inlet 102 matches the position of the brushless motor 104. An exhaust port 103 is opened on the outer wall of the housing 100. The output end of the brushless motor 104 is provided with an exhaust fan so that the inside of the housing 100 forms a flow channel through the air inlet 102 and the exhaust port 103. A connecting hole 106 is opened on the inner wall of the housing 100. An air jet hole 107 is fixedly connected to the outer wall of the housing 100. The air jet hole 107 communicates with the inside of the housing 100. A one-way valve is provided inside the air jet hole 107 so that the air jet hole 107 sprays air towards the chuck 101.

[0034] When the brushless motor-driven pistol drill is put into use, after the drill bit is placed and clamped in the chuck 101, the drill bit is aligned with the work area, and the brushless motor 104 is started to drive the drive gear 105 to rotate inside the housing 100. The drive gear 105 drives the drive rod 302 to rotate on the inner wall of the housing 100. The connecting rod 301 is supported by the elastic push rod 305, so that the hinge plate 303 is in a stretched state. The drive rod 302 transmits the rotational force, so that the drive rod 302 drives the connecting rod 301 to rotate on the inner wall of the housing 100 through the hinge plate 303. The connecting rod 301 drives the drill bit to drill. When the drill bit is subjected to a reverse torsional force during drilling, the reverse torsional force is transmitted to the connecting rod 301 through the chuck 101. This causes the connecting rod 301 and the drive rod 302 to twist, causing the hinge plate 303 to bend and release the force. At the same time, the hinge plate 301... 03 During the bending process, the distance shortens, causing the hinge plate 303 to drive the connecting rod 301 to compress the elastic push rod 305 and slide it on the inner wall of the housing 100. This allows the connecting rod 301 to drive the drill bit to retract through the chuck 101, reducing the depth of cut of the drill bit. This prevents the drill bit from being subjected to reverse torsional force during drilling, which is transmitted to the drive rod 302. This reduces the load resistance on the brushless motor 104, prevents the brushless motor 104 from overheating due to obstruction, and increases the service life of the brushless motor 104. At the same time, during operation, the brushless motor 104 drives the exhaust fan to rotate, causing the air inside the housing 100 to be discharged through the exhaust port 103. Meanwhile, external air enters the housing 100 through the air inlet 102, forming a flow channel inside the housing 100 to cool the brushless motor 104 and prevent the temperature of the brushless motor 104 from rising.

[0035] Example 2, based on Example 1, please refer to... Figures 4-6 The present invention provides a technical solution: an impact mechanism 200 is provided inside the housing 100;

[0036] During drilling, the high-speed characteristics of the brushless motor 104 cause the hand-held gun drill to heat up rapidly under load resistance, resulting in a decrease in the motor's output torque and affecting drilling efficiency. Long-term overheating can also reduce the lifespan of the motor. Therefore, the impact mechanism 200 and the buffer mechanism 300 are designed to work together to impact the drill during drilling, increasing the drilling efficiency of the hand-held gun drill. At the same time, the buffer mechanism 300 dissipates the impact vibration, reducing the vibration force transmitted to the gripping part and increasing the operational stability of the hand-held gun drill. In addition, the impact mechanism 200 extracts air from the extraction housing 100, increasing the air intake of the brushless motor 104's heat dissipation area and improving the heat dissipation efficiency of the brushless motor 104. The extracted air is then discharged from the air vent 107 to clean up the drill debris, preventing the debris from affecting the drilling accuracy and drill bit lifespan, and increasing the stability of the hand-held gun drill during operation.

[0037] The impact mechanism 200 includes a limiting sleeve 204, the outer wall of which is fixedly connected to the inner wall of the housing 100. The inner wall of the limiting sleeve 204 is rotatably connected to the outer wall of the drive rod 302 via a bearing. An impact block 201 is slidably connected to the inner wall of the limiting sleeve 204. A spline groove 206 is provided on the inner wall of the limiting sleeve 204. The outer wall of the impact block 201 is inserted into the inner wall of the spline groove 206 via a spline. The spline groove 206 is used to limit the rotation of the impact block 201. The inner wall of the impact block 201 is connected along the connecting... The outer wall of rod 301 slides, and the impact block 201 guides the connecting rod 301. The connecting rod 301 rotates on the inner wall of the impact block 201. A circulation groove 207 is provided on the inner wall of the impact block 201. A limit block 306 is fixedly connected to the outer wall of the connecting rod 301. The limit block 306 slides along the groove wall of the circulation groove 207. During rotation, the connecting rod 301 slides in the circulation groove 207 through the limit block 306, causing the impact block 201 to slide on the outer wall of the connecting rod 301. As the impact block 201 slides along the outer wall of the connecting rod 301, it contacts the outer wall of the support platform 304, striking the support platform 304. A baffle 202 is fixedly connected to the outer wall of the impact block 201, and a support sleeve 205 is slidably connected to the outer wall of the limiting sleeve 204. The end of the support sleeve 205 near the baffle 202 contacts the outer wall of the baffle 202, and the support sleeve 205 supports the baffle 202. A support spring 203 is fixedly connected to the outer wall of the support sleeve 205. 3. The other end is fixedly connected to the outer wall of the limiting sleeve 204. The support spring 203 is used to support the baffle 202 through the support sleeve 205. The outer wall of the baffle 202 slides along the inner wall of the housing 100 through the sealing ring. A one-way valve is provided inside the baffle 202 to draw the air away from the jet hole 107 to the cavity near the jet hole 107. The inner wall of the impact block 201 slides along the outer wall of the hinge plate 303 to limit the hinge plate 303.

[0038] During the drilling process, as the connecting rod 301 drives the drill bit through the chuck 101, the connecting rod 301 rotates on the inner wall of the impact block 201, causing the limiting block 306 to slide along the wall of the circulation groove 207. This causes the limiting block 306 to drive the impact block 201 to reciprocate on the outer wall of the connecting rod 301 via the circulation groove 207. Simultaneously, the impact block 201 is limited by the spline groove 206, sliding on the inner wall of the limiting sleeve 204 and preventing rotation. Furthermore, the impact block 201 is also restrained by the baffle 202. The support sleeve 205 provides support, causing it to press against the support spring 203 and slide against the outer wall of the limiting sleeve 204. The support spring 203 also supports the support sleeve 205, which in turn supports the impact block 201 via the baffle 202, causing the impact block 201 to reset. Simultaneously, as the impact block 201 slides against the outer wall of the connecting rod 301, its outer wall contacts the outer wall of the support platform 304, striking the support platform 304 and causing the connecting rod 301 to vibrate. The vibration force is transmitted to the drill bit through the chuck 101, causing the drill bit to impact inside the hole. As the impact block 201 slides back and forth on the outer wall of the connecting rod 301, it drives the baffle 202 to slide on the inner wall of the housing 100. The sealing ring on the outer wall of the baffle 202 seals the side of the baffle 202 near the jet hole 107. As the baffle 202 slides away from the jet hole 107, air in the cavity on the side of the baffle 202 away from the jet hole 107 is drawn into the cavity on the side of the baffle 202 near the jet hole 107. As the baffle 202 slides towards the jet hole 107, the gas in the cavity on the side of the baffle 202 near the jet hole 107 is ejected through the jet hole 107 to clean up the debris generated during drilling. At the same time, the cavity on the side of the baffle 202 away from the jet hole 107 draws air from inside the housing 100 through the connecting hole 106, increasing the air intake of the air inlet 102 and increasing the heat dissipation efficiency of the brushless motor 104.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A brushless motor driven hand drill, comprising a shell (100), a brushless motor (104) fixedly connected to the inner wall of the shell (100), and a driving tooth (105) rotatably connected to the inner wall of the shell (100) through a bearing, characterized in that, A buffer mechanism (300) is provided inside the housing (100). The buffer mechanism (300) includes; A drive rod (302) is fixedly connected to the inner wall of the drive tooth (105) on its outer wall near the drive tooth (105). A hinge plate (303) is hinged to the outer wall of the drive rod (302) via a rotating shaft. A connecting rod (301) is hinged to the other end of the hinge plate (303) via a rotating shaft. An elastic push rod (305) is fixedly connected to the inner wall of the drive rod (302). The other end of the elastic push rod (305) is fixedly connected to the inner wall of the connecting rod (301). The elastic push rod (305) is used to support the connecting rod (301). The hinge plate (303) is used to transmit driving force. The hinge plate (303) is elastic and is used to dissipate the torsional force generated between the connecting rod (301) and the drive rod (302).

2. The brushless motor-driven pistol drill according to claim 1, characterized in that: The output end of the brushless motor (104) is connected to the outer wall of the drive tooth (105) through meshing. The brushless motor (104) is used to drive the drive tooth (105) to rotate inside the housing (100). The outer wall of the drive rod (302) is rotatably connected to the inner wall of the housing (100) through a bearing. A chuck (101) is fixedly connected to the end of the connecting rod (301) away from the drive rod (302). The chuck (101) is used to clamp the drill bit. A support platform (304) is fixedly connected to the outer wall of the connecting rod (301). The outer wall of the support platform (304) is slidably connected to the inner wall of the housing (100). The housing (100) is used to guide and support the connecting rod (301).

3. A brushless motor-driven pistol drill according to claim 2, characterized in that: An air inlet (102) is provided on the outer wall of the housing (100), and the position of the air inlet (102) matches the position of the brushless motor (104). An exhaust port (103) is provided on the outer wall of the housing (100). The output end of the brushless motor (104) is provided with an exhaust fan, so that the interior of the housing (100) forms a flow channel through the air inlet (102) and the exhaust port (103).

4. A brushless motor-driven pistol drill according to claim 3, characterized in that: The inner wall of the housing (100) is provided with a connection hole (106), and the outer wall of the housing (100) is fixedly connected with a jet hole (107). The jet hole (107) communicates with the interior of the housing (100), and a one-way valve is provided inside the jet hole (107) so that the jet hole (107) sprays air towards the clamp (101).

5. A brushless motor-driven pistol drill according to claim 4, characterized in that: An impact mechanism (200) is provided inside the housing (100). The impact mechanism (200) includes a limiting sleeve (204). The outer wall of the limiting sleeve (204) is fixedly connected to the inner wall of the housing (100). The inner wall of the limiting sleeve (204) is rotatably connected to the outer wall of the drive rod (302) through a bearing. An impact block (201) is slidably connected to the inner wall of the limiting sleeve (204). A spline groove (206) is provided on the inner wall of the limiting sleeve (204). The outer wall of the impact block (201) is inserted into the inner wall of the spline groove (206) through a spline. The spline groove (206) is used to restrict the rotation of the impact block (201).

6. A brushless motor-driven pistol drill according to claim 5, characterized in that: The inner wall of the impact block (201) slides along the outer wall of the connecting rod (301). The impact block (201) guides the connecting rod (301). The connecting rod (301) rotates on the inner wall of the impact block (201). A circulation groove (207) is provided on the inner wall of the impact block (201). A limiting block (306) is fixedly connected to the outer wall of the connecting rod (301). The limiting block (306) slides along the groove wall of the circulation groove (207). During the rotation of the connecting rod (301), it slides in the groove of the circulation groove (207) through the limiting block (306), so that the impact block (201) slides on the outer wall of the connecting rod (301). During the sliding process of the outer wall of the connecting rod (301), the impact block (201) contacts the outer wall of the support platform (304) and strikes the support platform (304).

7. A brushless motor-driven pistol drill according to claim 6, characterized in that: A baffle (202) is fixedly connected to the outer wall of the impact block (201), and a support sleeve (205) is slidably connected to the outer wall of the limiting sleeve (204). One end of the support sleeve (205) near the baffle (202) is in contact with the outer wall of the baffle (202). The support sleeve (205) is used to support the baffle (202). A support spring (203) is fixedly connected to the outer wall of the support sleeve (205). The other end of the support spring (203) is fixedly connected to the outer wall of the limiting sleeve (204). The support spring (203) is used to support the baffle (202) through the support sleeve (205).

8. A brushless motor-driven pistol drill according to claim 7, characterized in that: The outer wall of the baffle (202) slides along the inner wall of the housing (100) via a sealing ring. A one-way valve is provided inside the baffle (202) to draw air from the side of the baffle (202) away from the jet hole (107) into the cavity on the side closer to the jet hole (107). The inner wall of the impact block (201) slides along the outer wall of the hinge plate (303) to limit the hinge plate (303).

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