Motor braking structure

Abstract

The utility model relates to the technical field of electric tools, in particular to a motor braking structure which comprises a series motor, and a rotating shaft is mounted in the series motor. The brake device further comprises a brake assembly, the brake assembly comprises a switch trigger, a spring is fixedly arranged on one side of the switch trigger, a brake disc seat is fixedly connected to one side of the switch trigger, and a brake disc is arranged in the brake disc seat. In an initial state, the switch trigger is not stressed, and the brake disc keeps in contact with the end part of the rotating shaft under the acting force of the spring, so that braking is realized; and in a working state, the switch trigger is pressed down, so that the brake disc is far away from the end part of the rotating shaft, and the series motor normally rotates. In the application, through controlling the switch trigger, the contact and separation between the brake disc and the rotating shaft are realized, the normal operation and braking of the series motor are controlled, the cost is saved, no electric spark is generated during braking, the use is convenient, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of electric tools, and in particular to a motor braking structure. Background Art

[0002] Common power tools, such as angle grinders, electric drills, and cutting machines, mostly use series-excited motors. Traditional series-excited motors (also called series-excited motors) usually use electromagnetic braking to achieve the braking function. One common design is to add a special brake winding (auxiliary winding) to the motor. When braking is required, this brake winding is energized to generate a magnetic field, which interacts with the rotating parts of the motor to generate a braking torque to achieve rapid stopping or maintain stillness.

[0003] When the brake winding is energized, especially during the switching process, sparks are easily generated due to changes in the electromagnetic field and the contact and commutation process between the brush and the commutator. The generation of sparks will accelerate the wear of the brushes and commutator. Excessive sparks for a long time will not only affect the working efficiency of the motor, but may also cause increased loss of brush and commutator materials, reduce the life of the motor, and may even cause safety problems.

[0004] In this regard, the present application proposes a motor braking structure to solve this problem. Summary of the invention

[0005] The purpose of this application is to solve at least one of the technical deficiencies.

[0006] To this end, one purpose of the present application is to propose a motor braking structure to solve the problems mentioned in the background technology and overcome the deficiencies in the prior art.

[0007] In order to achieve the above-mentioned purpose, an embodiment of one aspect of the present application provides a motor braking structure, including a series-excited motor with a rotating shaft installed inside the series-excited motor; and also including a brake assembly, the brake assembly including a switch trigger, a spring fixedly provided on one side of the switch trigger, a brake disc seat fixedly connected to one side of the switch trigger, and a brake disc provided inside the brake disc seat; in an initial state, the switch trigger is not subjected to force, and under the action of the spring, the brake disc maintains contact with the end of the rotating shaft to achieve braking; in a working state, the switch trigger is pressed down to move the brake disc away from the end of the rotating shaft, so that the series-excited motor rotates normally.

[0008] Preferably, any of the above schemes has a shift block rotatably connected to one side of the switch trigger, a tension spring fixedly connected to one side of the shift block, a tension spring fixedly connected to one side of the switch trigger, a locking block fixedly connected to one side of the shift block, and a slot provided on one side of the locking block.

[0009] Preferably, any of the above schemes has a placement groove on one side of the brake disc seat, and one side of the brake disc seat is semicircular, so as to facilitate the removal of the brake disc.

[0010] Preferably, any of the above schemes is that the brake disc is placed inside the placement groove, and the brake disc is detachably connected to the disc seat by screws.

[0011] Preferably, any of the above schemes has a protrusion fixedly connected to one side of the brake disc for limiting the brake disc to prevent the brake disc from rotating.

[0012] Preferably, any of the above schemes has one side of the switch trigger rotatably connected to a housing, one side of the housing is fixedly connected to a mounting piece, one side of the mounting piece is fixedly connected to one side of the spring, one side of the mounting piece is fixedly connected to a locking piece, and the locking piece cooperates with the locking block to lock the switch trigger.

[0013] Preferably, any of the above schemes is provided with a stopper installed inside the housing, and the stopper is used to limit the movement of the brake disc seat.

[0014] Preferably, any of the above schemes has a knurled pattern at the rear end of the rotating shaft to increase the friction between the rotating shaft and the brake disc.

[0015] Compared with the prior art, the advantages and beneficial effects of this application are:

[0016] In the present application, the contact and disengagement between the brake disc and the rotating shaft are achieved by controlling the switch trigger, thereby controlling the normal operation and braking of the series-excited motor, saving costs, and no electric sparks are generated during braking. The application is convenient to use and the service life of the motor is increased.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a schematic diagram of a first viewing angle according to an embodiment of the present application;

[0020] Figure 2 It is a schematic diagram of a second viewing angle according to an embodiment of the present application;

[0021] Figure 3 A schematic diagram of a brake assembly according to an embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of a brake disc explosion according to an embodiment of the present application;

[0023] Figure 5 Schematic diagram of locking block connection according to an embodiment of the present application.

[0024] In the figure: 1, series motor, 2, rotating shaft, 3, brake assembly, 301, switch trigger, 302, spring, 303, brake disc seat, 304, brake disc, 305, shift block, 306, tension spring, 307, screw, 308, protrusion, 309, locking block, 4, housing, 401, mounting part, 402, locking part, 403, baffle. DETAILED DESCRIPTION

[0025] like Figures 1 to 5 As shown, a motor braking structure includes a series-excited motor 1, in which a rotating shaft 2 is installed; and a braking assembly 3.

[0026] Furthermore, in order to facilitate braking of the series-excited motor, a brake assembly is provided in the present application, wherein the brake assembly 3 includes a switch trigger 301, one side of the switch trigger 301 is fixedly connected to a spring 302, one side of the switch trigger 301 is fixedly connected to a brake disc seat 303, a brake disc 304 is provided inside the brake disc seat 303, one side of the switch trigger 301 is rotatably connected to a shift block 305, one side of the shift block 305 is fixedly connected to a tension spring 306, one side of the tension spring 306 is fixedly connected to one side of the switch trigger 301, A locking block 309 is fixedly connected to one side of the shift block 305, a notch is provided on one side of the locking block 309, a placement groove is provided on one side of the brake disc seat 303, one side of the brake disc seat 303 is semicircular, which is convenient for removing the brake disc 304, and the brake disc 304 is placed inside the placement groove. The brake disc 304 is detachably connected to the disc seat 303 by a screw 307, and a protrusion 308 is fixedly connected to one side of the brake disc 304 for limiting the brake disc 304 to prevent the brake disc 304 from rotating.

[0027] The shifting block 305 is deflected, and the shifting block 305 drives the locking block 309 to move, so that the locking block 309 is separated from the locking member 402. At this time, the switch trigger 301 can be operated.

[0028] Furthermore, one side of the switch trigger 301 is rotatably connected to the housing 4 , one side of the housing 4 is fixedly connected to a mounting member 401 , and one side of the mounting member 401 is fixedly connected to one side of the spring 302 .

[0029] Furthermore, in order to cooperate with the locking block 309 to lock the switch trigger 301 , a locking member 402 is fixedly connected to one side of the mounting member 401 .

[0030] Furthermore, in order to limit the movement of the brake disc seat 303 , a stopper 403 is installed inside the housing 4 , and one side of the baffle is movably connected to a groove on one side of the brake disc seat 303 .

[0031] Furthermore, in order to increase the friction between the rotating shaft 2 and the brake disc 304 , a knurling pattern is provided on a section of the rotating shaft 2 close to the brake disc 304 , and a rubber sleeve may be installed on the rear end of the rotating shaft 2 .

[0032] A motor braking structure, the working principle is as follows:

[0033] When starting the motor, the switch trigger 301 is pressed, and the switch trigger 301 moves downward and squeezes the spring 302, so that the brake disc 304 is separated from the rotating shaft 2. At this time, the series-excited motor 1 moves normally. When shutting down, the switch trigger 301 is released. At this time, the spring 302 is no longer under force, and the switch trigger 301 is pushed back to reset, so that the brake disc 304 moves upward and contacts the tail end of the rotating shaft 2, generating friction, thereby achieving the purpose of braking the series-excited motor 1.

Claims

1. A motor braking structure, characterized in that: It comprises a series-excited motor (1), wherein a rotating shaft (2) is installed inside the series-excited motor (1); It also includes a brake assembly (3), the brake assembly (3) including a switch trigger (301), a spring (302) being fixedly provided on one side of the switch trigger (301), a brake disc seat (303) being fixedly connected to one side of the switch trigger (301), and a brake disc (304) being provided inside the brake disc seat (303); In an initial state, the switch trigger (301) is not subjected to force, and under the force of the spring (302), the brake disc (304) maintains contact with the end of the rotating shaft (2), thereby achieving braking. In a working state, by pressing down the switch trigger (301), the brake disc (304) is moved away from the end of the rotating shaft (2), thereby causing the series-excited motor (1) to rotate normally.

2. A motor brake structure according to claim 1, characterized in that: One side of the switch trigger (301) is rotatably connected to a shift block (305), one side of the shift block (305) is fixedly connected to a tension spring (306), one side of the tension spring (306) is fixedly connected to one side of the switch trigger (301), one side of the shift block (305) is fixedly connected to a locking block (309), and one side of the locking block (309) is provided with a notch.

3. The motor brake structure according to claim 1, characterized in that: A placement groove is provided on one side of the brake disc seat (303), and one side of the brake disc seat (303) is semicircular, so that the brake disc (304) can be easily removed.

4. A motor brake structure according to claim 3, characterized in that: The brake disc (304) is placed inside the placement groove, and the brake disc (304) is detachably connected to the disc seat (303) via screws (307).

5. The motor brake structure according to claim 1, characterized in that: A protrusion (308) is fixedly connected to one side of the brake disc (304) and is used to limit the position of the brake disc (304) to prevent the brake disc (304) from rotating.

6. The motor brake structure according to claim 2, characterized in that: One side of the switch trigger (301) is rotatably connected to a housing (4), one side of the housing (4) is fixedly connected to a mounting member (401), one side of the mounting member (401) is fixedly connected to one side of the spring (302), one side of the mounting member (401) is fixedly connected to a locking member (402), and the locking member (402) cooperates with the locking block (309) to lock the switch trigger (301).

7. The motor brake structure according to claim 6, characterized in that: A stopper (403) is installed inside the housing (4), and the stopper (403) is used to limit the movement of the brake disc seat (303).

8. The motor brake structure according to claim 1, characterized in that: The rear end of the rotating shaft (2) is provided with a knurled pattern, which is used to increase the friction between the rotating shaft (2) and the brake disc (304).

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