Electric power tool of hall commutation structure

Abstract

The application discloses a kind of electric tools of hall commutation structure, and relate to the technical field of electric tool.Its technical points are: including left casing, right casing, commutation fixed seat, commutation lever, steel ball, small first spring, commutation rod, first magnet, second magnet, first hall sensor, second hall sensor, control board assembly, by control board assembly to control motor rotation and then realize commutation function, the application has the advantages: using hall sensor can achieve contactless mode output commutation signal, without mechanical friction, so that tool assembly is simple, long service life, stable work.

Description

Technical Field

[0001] This invention relates to the technical field of power tools, specifically to a power tool with a Hall effect commutation structure. Background Technology

[0002] Currently, DC power tools on the market generally use a motor + switch + control board assembly + gear transmission device + rotary actuator to achieve various control and rotation actions.

[0003] Existing DC power tools require a separate switching module. This has the following drawbacks:

[0004] 1. Adding a switch module makes the housing larger, with more leads, more complex manufacturing process, and higher cost;

[0005] 2. Conventional switches typically output commutation signals through mechanical contact between electrodes and the PCB trigger. However, due to the instability of this mechanical contact, the mechanical contact becomes unreliable when the power tool is vibrating, resulting in momentary disconnection and unstable operation of the power tool, causing the machine to turn on and off intermittently.

[0006] 3. Mechanical contact has a shorter lifespan. Current users have increasingly higher expectations for the lifespan of power tools, and mechanical wear can no longer meet the growing market demand for power tools. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a power tool with a Hall effect commutation structure, which has the following advantages: it eliminates the need for an independent switch module, and the tool commutation signal is sent to the control board assembly through a Hall sensor to achieve the commutation function, thereby achieving contactless output of the commutation signal, making the tool easy to assemble, with a long service life and stable operation.

[0008] The above-mentioned objective of the present invention is achieved through the following technical solution:

[0009] A power tool with a Hall effect commutation structure includes a left housing and a right housing joined together. A motor is installed within a gap formed between the left and right housings. The output end of the motor is connected to a gear transmission device, which is located within the gap. One end of the gear transmission device is connected to a rotary actuator, which is located outside the gap. A trigger is also installed in the gap. One end of the trigger is connected to a trigger link, which is located within the gap. The other end of the trigger link is connected to a second spring, the other end of which is connected to the space formed between the left and right housings. The wall is further provided with a reversing fixing seat. The two ends of the reversing fixing seat are respectively fixed to the left housing and the right housing. A reversing lever is installed on the upper end of the reversing fixing seat, and a reversing rod is installed on the other end of the reversing fixing seat. The reversing lever is mechanically connected to the reversing rod and controls the reversing of the reversing rod. The reversing lever is locked to the reversing fixing seat by a buckle. A first magnet and a second magnet are installed on both sides of the reversing rod. A control board assembly is correspondingly provided on the upper side of the reversing rod. The control board assembly is located in the gap. A first Hall sensor and a second Hall sensor are correspondingly installed on the control board assembly.

[0010] In a preferred embodiment, the present invention can be further configured such that the first Hall sensor and the second Hall sensor are both electrically connected to the control board assembly, and neither the first Hall sensor nor the second Hall sensor is in contact with the first magnet or the second magnet.

[0011] In a preferred embodiment, the present invention may be further configured such that both the first magnet and the second magnet are detachably connected to the reversing rod.

[0012] In a preferred embodiment, the present invention may be further configured such that the control board assembly is electrically connected to the motor.

[0013] In a preferred embodiment, the present invention can be further configured such that: a steel ball and a first spring are also installed inside the reversing fixing seat, and the reversing lever is locked to the reversing fixing seat by a buckle, the buckle being able to position the reversing lever in the left, middle, and right positions.

[0014] In summary, the present invention has at least one of the following beneficial technical effects:

[0015] 1. Eliminate the independent switch module to reduce costs;

[0016] 2. The tool reversing signal is sent to the control board assembly using a Hall sensor to achieve the reversing function;

[0017] 3. Using Hall effect sensors enables contactless output of commutation signals, eliminating mechanical friction and resulting in simple tool assembly, long service life, and stable operation. Attached Figure Description

[0018] Figure 1 This is a partial structural cross-sectional view of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0020] Figure 3 This is an exploded view of the structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the commutation structure of the present invention.

[0022] Reference numerals: 1. Left housing; 2. Right housing; 3. Motor; 4. Gear transmission device; 5. Rotary actuator; 6. Reversing mounting base; 7. Reversing lever; 8. Reversing rod; 9. First magnet; 10. Second magnet; 11. Control board assembly; 12. First Hall sensor; 13. Second Hall sensor; 14. Steel ball; 15. First spring; 16. Buckle; 17. Trigger; 18. Trigger linkage; 19. Second spring. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Reference Figure 1-4This invention discloses a Hall effect commutation structure power tool, comprising a left housing 1 and a right housing 2, which are joined together and are essentially the same as the housing of a conventional power tool. The joined components can be secured with screws. A motor 3 is installed within the gap formed between the left housing 1 and the right housing 2. This motor 3 can be a servo motor 3, enabling forward and reverse rotation. A gear transmission device 4 is connected to the output end of the motor 3. This gear transmission device 4 can be based on existing designs, as long as it drives the rotary actuator 5 to rotate normally. The gear transmission device 4 is placed within the gap, with one end connected to the rotary actuator 5, which is located outside the gap. The outer end of the rotary actuator 5 is not limited to a single-function tool head; it can also be a clamping structure to easily clamp different tool heads, such as drill bits, socket wrenches, etc., thus achieving multi-functionality for the power tool. A trigger 17 is also installed in the gap. One end of the trigger 17 is connected to a trigger link 18, which is placed in the gap. The other end of the trigger link 18 is connected to a second spring 19, which is connected to the inner wall formed by the left housing 1 and the right housing 2. The restoring force of the second spring 19 is transmitted to the trigger link 18 and then to the trigger 17 to achieve the reset of the trigger 17.

[0025] like Figure 3 and Figure 4 As shown, a reversing fixing seat 6 is also provided. The two ends of the reversing fixing seat 6 are fixed to the left housing 1 and the right housing 2 respectively, i.e., the reversing fixing seat 6 is fixed by the left housing 1 and the right housing 2. A reversing lever 7 is installed on the upper end of the reversing fixing seat 6, and a reversing rod 8 is installed on the other end of the reversing fixing seat 6. The reversing lever 7 and the reversing rod 8 are mechanically connected. This mechanical connection is a linkage mechanism, which only needs to ensure that the reversing lever 7 controls the reversing rod 8 to change direction. A first magnet 9 and a second magnet 10 are installed on both sides of the reversing rod 8. The magnets are detachably connected to the reversing rod 8 and can be installed by embedding or gluing. The magnet material can be neodymium iron boron, ferrite, etc., as long as the material is compatible with the Hall sensor to achieve Hall motion.

[0026] like Figure 1-4 As shown, a control board assembly 11 is correspondingly disposed on the upper side of the commutator 8. The control board assembly 11 is located within the gap, and a first Hall sensor 12 and a second Hall sensor 13 are respectively mounted on the control board assembly 11. The control board is electrically connected to the first Hall sensor 12 and the second Hall sensor 13, respectively, and neither the first Hall sensor 12 nor the second Hall sensor 13 is in contact with the first magnet 9 or the second magnet 10. Here, both the first Hall sensor 12 and the second Hall sensor 13 are linear Hall sensors. The rotational speed is controlled by controlling the relative position of the magnets and the Hall sensors.

[0027] like Figure 3 As shown, a steel ball 14 and a first spring 15 are also installed inside the reversing fixing seat 6. The reversing lever 7 is locked to the reversing fixing seat 6 by a buckle 16. The restoring force of the steel ball 14 and the first spring 15 is used to lock the reversing lever 8. The locking of the buckle 16 to the reversing fixing seat 6 can realize the positioning of the reversing lever 8 in the left, center, and right positions.

[0028] The working principle of this embodiment is as follows: the commutator lever 8 drives the magnetic field of the magnet and the Hall sensor to sense the magnetic field, so that the Hall sensor outputs different commutation signals. The control board controls the direction of the motor 3 to achieve the commutation function. Pulling the trigger 17 controls the speed by controlling the relative position of the magnet and the Hall sensor.

[0029] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A power tool with a Hall effect switching structure, comprising a left housing (1) and a right housing (2) joined together, wherein a motor (3) is installed in a gap formed between the left housing (1) and the right housing (2), the output end of the motor (3) is connected to a gear transmission device (4), the gear transmission device (4) is placed in the gap, one end of the gear transmission device (4) is connected to a rotary actuator (5), the rotary actuator (5) is located outside the gap, a trigger (17) is also installed in the gap, one end of the trigger (17) is connected to a trigger link (18), the trigger link (18) is placed in the gap, the other end of the trigger link (18) is connected to a second spring (19), the other end of the second spring (19) is connected to the inner wall formed by the left housing (1) and the right housing (2), characterized in that, A reversing fixing seat (6) is provided. The two ends of the reversing fixing seat (6) are respectively fixed on the left housing (1) and the right housing (2). A reversing lever (7) is installed on the upper end of the reversing fixing seat (6), and a reversing rod (8) is installed on the other end of the reversing fixing seat (6). The reversing lever (7) is mechanically connected to the reversing rod (8). The reversing lever (7) controls the reversing rod (8) to change direction. A first magnet (9) and a second magnet (10) are installed on both sides of the reversing rod (8). A control board assembly (11) is correspondingly provided on the upper side of the reversing rod (8). The control board assembly (11) is located in the gap. A first Hall sensor (12) and a second Hall sensor (13) are correspondingly installed on the control board assembly (11).

2. The power tool with a Hall effect commutation structure according to claim 1, characterized in that, The first Hall sensor (12) and the second Hall sensor (13) are both electrically connected to the control board assembly (11), and neither the first Hall sensor (12) nor the second Hall sensor (13) is in contact with the first magnet (9) or the second magnet (10).

3. The power tool with a Hall effect commutation structure according to claim 1, characterized in that, The first magnet (9) and the second magnet (10) are both detachably connected to the reversing rod (8).

4. The power tool with a Hall effect commutation structure according to claim 1, characterized in that, The control board assembly (11) is electrically connected to the motor (3).

5. A power tool with a Hall effect commutation structure according to claim 1, characterized in that, The reversing fixing seat (6) is also equipped with a steel ball (14) and a first spring (15). The reversing lever (7) is locked to the reversing fixing seat (6) by a buckle (16). The buckle (16) can realize the positioning of the left, middle and right positions of the reversing lever (8).

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