Brushless direct-drive angle grinder

Abstract

The utility model discloses a brushless direct drive angle grinder which comprises a machine head, a handle, a left machine shell, a right machine shell and a draught fan, the machine head is connected with one end of the handle, a motor cavity used for installing a motor is arranged in the machine head, the left machine shell and the right machine shell are arranged at the other end of the handle, and the draught fan is arranged in the motor cavity. The machine head comprises a machine head front wall and a machine head rear wall, a channel is formed in the handle, one end of the channel faces the machine head rear wall, and the fan is arranged at the other end of the channel or arranged in the left machine shell and the right machine shell. The design that the motor cavity on the inner side of the machine head is directly and tightly matched with the motor is adopted, the machine head rear wall and the machine head front wall are formed on the outer side of the machine head while excellent heat conductivity is guaranteed, the fan is combined with the channel, generated air flow is guided and gathered in the channel and then directly blows the machine head rear wall to rapidly dissipate heat, and the heat dissipation performance is effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of power tools and relates to a brushless direct drive angle grinder. Background Technology

[0002] Angle grinders are a common type of power tool. During operation, they generate a lot of heat due to high-speed operation. Current angle grinder cooling designs typically use fans to create airflow for heat dissipation. However, angle grinders produce a lot of dust during operation. The fan blowing directly onto the motor can cause dust to enter the motor and cause damage, making it difficult to balance excellent heat dissipation performance and operational safety in the design. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a brushless direct drive angle grinder.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A brushless direct-drive angle grinder includes a head, a handle, a left housing, a right housing, and a fan. The head is connected to one end of the handle. The head has a motor cavity for mounting a motor. The left and right housings are located at the other end of the handle. The head includes a front wall and a rear wall. The handle has a channel, one end of which faces the rear wall of the head. The fan is located at the other end of the channel, or inside the left and right housings. Air outlets are located on both sides of the head. The airflow from the fan blows towards the rear wall of the head and outwards through the air outlets.

[0006] Furthermore, the left and right housings are joined together to form an internal cavity for housing the control circuit, and the other end of the channel communicates with the internal cavity. An air inlet is provided on the left or right housing.

[0007] Furthermore, the motor includes a stator and a rotor, and the inner peripheral wall of the motor cavity is connected to the outer peripheral wall of the stator.

[0008] Furthermore, the outer circumferential annular array of the rotor is provided with six magnets.

[0009] Furthermore, the stator includes a plurality of laminations distributed along a ring array, and windings are provided on the laminations.

[0010] Furthermore, the stamping is in the shape of an I-beam, and a retaining strip and a retaining groove are respectively provided on both sides of the stamping.

[0011] Furthermore, it also includes a circuit board, which is disposed at one axial end of the stator and connected to the winding.

[0012] Furthermore, the rotor includes a motor shaft with threads for mounting a tool head.

[0013] Furthermore, the machine head is provided with a self-locking part for locking the motor shaft.

[0014] Furthermore, a switch is provided at the front end of the handle.

[0015] In summary, the advantages of this utility model are as follows:

[0016] This utility model adopts a design in which the motor cavity inside the head is directly and tightly fitted with the motor, ensuring excellent thermal conductivity. At the same time, a rear wall and a front wall of the head are formed on the outside of the head. By combining the fan and the channel, the airflow is generated, guided and gathered in the channel, and then blows directly onto the rear wall of the head for rapid heat dissipation, effectively improving the heat dissipation performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the angle grinder of this utility model.

[0018] Figure 2 for Figure 1 A cross-sectional structural diagram.

[0019] Figure 3 This is a schematic diagram of the disassembled structure of the angle grinder head.

[0020] Figure 4 This is a schematic diagram of the rotor and stator structure of the electric motor.

[0021] Figure 5 This is a schematic diagram of the stator lamination structure.

[0022] The diagram shows the following components: 1. Head unit; 11. Front wall of head unit; 12. Rear wall of head unit; 13. Motor cavity; 14. Air outlet; 15. Self-locking part; 21. Switch; 2. Handle; 31. Left housing; 32. Right housing; 4. Fan; 51. Stator; 511. Lamination; 512. Circuit board; 52. Rotor; 521. Magnet. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0024] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0025] In this embodiment of the invention, all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0026] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of this utility model may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0027] This utility model provides a brushless direct-drive angle grinder, as described in the reference. Figure 1 It includes the head 1, handle 2, left housing 31 and right housing 32.

[0028] The handle 2 is for the user to grip. The handle 2 includes two ends. The head 1 is fixedly connected to one end of the handle 2. A motor is installed inside the head 1.

[0029] The left housing 31 and the right housing 32 are fixedly connected to each other, forming an internal cavity for accommodating the control circuit. After the left housing 31 and the right housing 32 are connected, they are further fixedly connected to the other end of the handle 2.

[0030] The head 1 and handle 2 can be fixed together by screws. The head 1 has a motor cavity 13 for accommodating the motor. (Refer to...) Figure 3 The inner peripheral wall of the motor cavity 13 is preferably in the form of a circular hole, which is used to form a tight fit with the outer periphery of the stator 51 of the motor. That is, the inner peripheral wall of the motor cavity 13 forms the outer wall of the motor, providing excellent heat conduction from the motor to the motor head 1.

[0031] Reference Figure 4The motor also includes a rotor 52, which passes through the center of the stator 51. The rotor 52 includes a motor shaft, on which a magnet sleeve is fixedly fitted. Multiple magnets 521 are fixedly installed on the magnet sleeve. The multiple magnets 521 are exposed on the outer periphery of the rotor 52. The magnets 521 are arranged in a circular array around the motor shaft. In this embodiment, preferably, the number of magnets 521 is set to six, so as to form a six-level magnet 521 in the circumferential direction of the rotor 52. By exposing the magnets 521, the gap between them and the inner periphery of the stator 51 is reduced, so as to reasonably enhance the torque formed by the rotor 52 and the stator 51. The middle of the rotor 52 is the motor shaft. One axial end of the motor shaft passes through the outside of the head 1 and is provided with external or internal threads for connecting with the tool head of the angle grinder. The tool head of the angle grinder includes cutting discs, grinding discs, flap wheels, wire wheels, etc.

[0032] Reference Figure 5 The stator 51 is composed of multiple laminations 511 spliced ​​together. The laminations 511 have an I-shaped structure. Each lamination 511 has an independent winding in the middle. The multiple laminations 511 are distributed along a ring array to form a ring stator 51 structure. Each lamination 511 has a retaining strip and a retaining groove at its front and rear ends in the circumferential direction, which are used to form a retaining engagement with the adjacent laminations 511 to ensure accurate positioning between each lamination 511 and a stable structure when the stator 51 is assembled.

[0033] One end of the stator 51 along the axial direction is also provided with a circuit board 512 and a protective sleeve. The circuit board 512 has a ring structure and is distributed along the outer periphery of the stator 51. Each winding on the lamination 511 has an externally led pin, so that the pin of each winding is electrically connected to the circuit board 512. Thus, all the windings of the stator 51 are connected through the circuit board 512. The protective sleeve is fitted on the circuit board 512 to form protection.

[0034] Reference Figure 1 and Figure 2 The outer periphery of the head 1 forms a front wall 11 and a rear wall 12. The rear wall 12 faces the handle 2. The handle 2 has a channel. One end of the channel forms a connecting opening facing the rear wall 12, while the other end away from the head 1 is provided with a fan 4. When the fan 4 is working, it generates airflow. The airflow flows through the channel and blows directly onto the rear wall 12 to dissipate heat from the rear wall 12.

[0035] Air outlets 14 are provided on the left and right sides of the head unit 1, and the air outlets 14 are connected to the rear wall 12 of the head unit. The fan 4 blows air directly onto the rear wall 12 of the head unit, and the airflow is further blown outward along the air outlets 14.

[0036] Furthermore, the other end of the channel can also be configured to communicate with the internal cavity formed by the left housing 31 and the right housing 32. An air inlet is provided on the left housing 31 or the right housing 32 so that the airflow can enter the internal cavity through the air inlet and then enter the channel, and simultaneously dissipate heat from the control circuit. The fan 4 can also be installed inside the internal cavity.

[0037] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort should fall within the protection scope of this utility model.

Claims

1. A brushless direct-drive angle grinder, characterized in that, The device includes a head (1), a handle (2), a left housing (31), a right housing (32), and a fan (4). The head (1) is connected to one end of the handle (2). The head (1) has a motor cavity (13) for installing a motor. The left housing (31) and the right housing (32) are located at the other end of the handle (2). The head (1) includes a front wall (11) and a rear wall (12). The handle (2) has a channel, one end of which faces the rear wall (12). The fan (4) is located at the other end of the channel, or the fan (4) is located inside the left housing (31) and the right housing (32). The head (1) has air outlets (14) on both sides. The airflow from the fan (4) blows towards the rear wall (12) of the head and outwards through the air outlets (14).

2. The brushless direct-drive angle grinder according to claim 1, characterized in that, The left housing (31) and the right housing (32) are joined together to form an internal cavity for housing the control circuit. The other end of the channel is connected to the internal cavity. An air inlet is provided on the left housing (31) or the right housing (32).

3. A brushless direct-drive angle grinder according to claim 1, characterized in that, The motor includes a stator (51) and a rotor (52), and the inner peripheral wall of the motor cavity (13) is connected to the outer peripheral wall of the stator (51).

4. A brushless direct-drive angle grinder according to claim 3, characterized in that, The rotor (52) is provided with a ring array of six magnets (521) on its outer periphery.

5. A brushless direct-drive angle grinder according to claim 3, characterized in that, The stator (51) includes a plurality of laminations (511) arranged in a ring array, and the laminations (511) are provided with windings.

6. A brushless direct-drive angle grinder according to claim 5, characterized in that, The stamping piece (511) has an I-shaped structure, and the two sides of the stamping piece (511) are respectively provided with a retaining strip and a retaining groove.

7. A brushless direct-drive angle grinder according to claim 5, characterized in that, It also includes a circuit board (512), which is disposed at one axial end of the stator (51) and is connected to the winding.

8. A brushless direct-drive angle grinder according to claim 3, characterized in that, The rotor (52) includes a motor shaft with threads for mounting a tool head.

9. A brushless direct-drive angle grinder according to claim 8, characterized in that, The machine head (1) is provided with a self-locking part (15) for locking the motor shaft.

10. A brushless direct-drive angle grinder according to claim 1, characterized in that, A switch (21) is provided at the front end of the handle (2).

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