Shell assembly and electric tool

Abstract

The utility model discloses a shell assembly and an electric tool, the shell assembly comprises a head shell, a main shell and a rear cover body, and the head shell is used for installing a working head; the main shell is provided with a first end and a second end which are opposite to each other in the axial direction, the first end is connected with the head shell, and a cavity for accommodating the motor is formed in the main shell; the rear cover body covers the second end of the main shell and the local position close to the second end, an air duct is formed between the inner wall of the rear cover body and the outer wall of the main shell, and an air inlet hole communicated with the air duct is formed in the rear cover body; an air passing hole is formed in the position, close to the second end of the main shell, of the main shell so as to communicate the cavity with the air duct, the shell assembly further comprises a first filtering part, and the first filtering part is arranged corresponding to the air passing hole; therefore, large-particle impurities in the cold air flow can be filtered, so that the motor is prevented from being damaged by the large-particle impurities in the cold air flow, and the service life of the motor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a housing assembly and a power tool. Background Technology

[0002] Power tools typically include a housing, a motor assembly housed within the housing, and a working head driven by the motor assembly. Taking an angle grinder as an example, the angle grinder housing usually includes a head shell, a grip shell, and a rear cover connected in sequence; the working head is located in the head shell, and the motor assembly is located inside the grip shell; the grip shell near the rear cover usually has multiple through slots to provide housing space for some components of the motor assembly (such as brushes), but some through slots are empty; to dissipate heat from the motor assembly, some products have air inlets on the rear cover and air outlets on the head shell. During operation, cool air enters the rear cover through the air inlets, passes through the empty through slots into the grip shell to cool the motor assembly, and then exits through the air outlets on the head shell, thus achieving heat dissipation for the motor assembly; however, during the heat dissipation process, the airflow flowing from the through slots into the grip shell contains many large particles of impurities. These large particles of impurities can damage the motor assembly, thereby affecting the lifespan of the angle grinder. Utility Model Content

[0003] The main purpose of this utility model is to propose a housing assembly and power tool, which aims to solve the problem that existing power tools are damaged by large particles of impurities entering inside, thus affecting the service life of the power tool.

[0004] To achieve the above objectives, this utility model proposes a housing assembly, comprising:

[0005] Head housing, used to mount the working head;

[0006] A main housing having opposing first and second ends in its axial direction, the first end being connected to the head housing, the main housing forming a cavity for accommodating the motor; and,

[0007] The rear cover is provided on the second end of the main housing and a portion of it near the second end. An air duct is formed between the inner wall of the rear cover and the outer wall of the main housing. An air inlet is provided on the rear cover to communicate with the air duct.

[0008] The main housing has an air vent near its second end to connect the cavity with the air duct. The housing assembly also includes a first filter, which is provided corresponding to the air vent.

[0009] Optionally, the first filter section includes a mesh-like grid baffle, which is disposed on the main housing and located at the air passage.

[0010] Optionally, the air inlet is configured as an elongated hole, and the width of the air inlet in the direction of its minor axis is set to W1;

[0011] The mesh of the grid baffle is set as an elongated hole, and the width of the mesh in the direction of its minor axis is set as W2, where 0.5 < W2 / W1 < 0.7.

[0012] Optionally, the mesh of the grid baffle is configured as an elongated hole, with the short axis of the mesh arranged along the axial direction of the main housing and the long axis of the mesh arranged along the circumferential direction of the main housing; or, the short axis of the mesh is arranged along the circumferential direction of the main housing and the long axis of the mesh is arranged along the axial direction of the main housing.

[0013] Optionally, the grille baffle is integrally formed with the main housing; or, the grille baffle is set as a separate component.

[0014] Optionally, the motor of the power tool is configured as a brushed motor;

[0015] In the radial direction of the main housing, the air vent corresponds to the commutator of the brushed motor, and the first filter is disposed opposite to the commutator of the brushed motor.

[0016] Optionally, a through groove is provided near the second end of the main housing, the through groove connects to the cavity, and is arranged circumferentially with the air passage hole along the main housing, and the carbon brush assembly of the brushed motor is at least partially housed in the through groove.

[0017] Optionally, the air inlet includes at least one set of side air inlets located on the peripheral sidewall of the rear cover. The side air inlets include a first air inlet and a second air inlet. The first air inlet and the second air inlet are arranged at intervals along the circumference of the rear cover. The first air inlet is arranged in a grid pattern, and the second air inlet is an elongated hole with its long axis arranged along the axial direction of the rear cover.

[0018] Optionally, the rear cover has a rear end that is axially opposed to the main housing;

[0019] The air inlet includes at least one end air inlet, which is located at the rear end and is an elongated hole with its long axis perpendicular to the axial direction of the rear cover.

[0020] This utility model also proposes an electric tool, comprising:

[0021] The aforementioned housing assembly includes a head shell, a main housing, and a rear cover connected in sequence.

[0022] A working head is disposed on the head shell; and,

[0023] The motor is located in the main housing and is driven by the working head.

[0024] The technical solution provided by this utility model has at least the following advantages:

[0025] The housing assembly provided by this utility model includes a head shell, a main shell, and a rear cover that are connected and communicate with each other in sequence. The head shell is used to install a working head, the cavity of the main shell is used to house a motor, the motor drives and connects to the working head, and the rear cover covers a portion of the main shell. An air duct is formed between the rear cover and the main shell, and an air inlet is provided on the rear cover to connect the air duct. An air passage is provided on the main shell to connect the air duct and the cavity of the main shell. During the operation of the power tool, cold air can flow in from the air inlet and enter the cavity through the air passage to cool the running motor. At the same time, a first filter is provided at the air passage to filter large particulate impurities in the airflow, thereby preventing large particulate impurities in the cold airflow from damaging the motor and extending the service life of the motor. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the structure of an embodiment of a housing assembly provided by this utility model;

[0028] Figure 2 for Figure 1 A plan view showing the exploded structure of the housing assembly (excluding the dust filter);

[0029] Figure 3 for Figure 1 A three-dimensional schematic diagram showing the structural breakdown (including the dust filter) of the housing assembly;

[0030] Figure 4 for Figure 1 A cross-sectional view of the housing assembly along AA;

[0031] Figure 5 for Figure 1 A schematic diagram of the structure of the housing assembly relative to the main housing;

[0032] Figure 6 for Figure 1 A schematic diagram of the housing assembly with respect to the rear cover;

[0033] Figure 7 for Figure 1 A schematic diagram of the structure of the housing assembly with respect to the head shell;

[0034] Figure 8 A schematic diagram of the structure of an embodiment of an electric tool provided by this utility model;

[0035] Figure 9 for Figure 8 A cross-sectional view of the power tool along BB;

[0036] Figure 10 for Figure 8 Another structural diagram of the power tool (with hidden rear cover).

[0037] Explanation of icon numbers:

[0038] 1000 Power tool; 100 Housing assembly; 1 Head shell; 11 Air outlet; 2 Main housing; 21 First end; 22 Second end; 23 Cavity; 24 Air passage; 25 Through groove; 26 Reinforcing rib; 27 Mounting rib; 3 Rear cover; 31 Air inlet; 311 First air inlet; 312 Second air inlet; 313 End air inlet; 32 Rear end; 4 First filter section; 41 Grille baffle; 5 Dust filter; 200 Working head; 300 Motor; 301 Commutator; 302 Carbon brush assembly; 400 Handle grip; F1 Axial; F2 Radial.

[0039] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0043] Power tools are electrical devices widely used in construction, decoration, manufacturing, and repair. This utility model does not impose specific limitations on the type of power tool; for example, it could be an angle grinder, a grooving machine, or a cutting machine. For ease of understanding, the following description uses an angle grinder as an example and is provided in conjunction with the accompanying drawings.

[0044] An angle grinder's housing typically includes a head shell, a grip shell, and a rear cover connected in sequence. The working head is housed in the head shell, and the motor assembly is housed within the grip shell. The grip shell, near the rear end of the rear cover, usually has multiple through slots to provide space for some components of the motor assembly (such as brushes), but some through slots are empty. During use, airflow enters from the air inlet of the rear cover and exits from the air outlet of the head shell, thus dissipating heat from the inside of the angle grinder. The cold air flowing in from the air inlet carries large particles of impurities, which can enter the grip shell through the empty through slots, damaging the motor assembly and affecting the lifespan of the angle grinder.

[0045] To address the aforementioned issues, this application improves the housing assembly 100, which will be described below in conjunction with the accompanying drawings.

[0046] Please see Figures 1 to 7 The housing assembly 100 is applied to the power tool 1000 and includes a head housing 1, a main housing 2 and a rear cover 3. The head housing 1 is used to mount the working head 200. Taking an angle grinder as an example, the working head 200 can be set as a grinding wheel, a polishing wheel or a wire wheel. The working head 200 is rotatably mounted on the head housing 1, and the rotation axis of the working head 200 is set along the radial direction of the main housing 2.

[0047] The main housing 2 has a first end 21 and a second end 22 opposite to each other along its axial direction F1. The first end 21 is connected to the head housing 1. The main housing 2 forms a cavity 23 for accommodating the motor 300. The cavity 23 of the main housing 2 is connected to the interior of the head housing 1. The motor 300 is configured as a brushed motor. The axis of the motor 300 output shaft is aligned with the axial direction F1 of the main housing 2, and the output shaft of the motor 300 extends from the cavity 23 into the head housing 1. Since the axial direction F1 of the motor 300 output shaft is intersected with the rotation axis of the working head 200, a transmission assembly is usually provided to drive the connection between the output shaft of the motor 300 and the working head 200.

[0048] The rear cover 3 is installed on the second end 22 of the main housing 2 and a portion of the main housing 2 near the second end 22. An air duct is formed between the inner wall of the rear cover 3 and the outer wall of the main housing 2. The rear cover 3 is provided with an air inlet 31 that connects to the air duct. The main housing 2 is provided with an air passage 24 near its second end 22 to connect the cavity 23 with the air duct. The housing assembly 100 also includes a first filter 4, which is provided corresponding to the air passage 24.

[0049] The housing assembly 100 provided by this utility model includes a head shell 1, a main shell 2, and a rear cover 3 connected in sequence and in communication. The head shell 1 is used to install a working head 200. The cavity 23 of the main shell 2 is used to house a motor 300. The motor 300 drives and connects to the working head 200. The rear cover 3 covers a portion of the main shell 2. An air duct is formed between the rear cover 3 and the main shell 2. An air inlet 31 connected to the air duct is provided on the rear cover 3. An air passage 24 is provided on the main shell 2 to connect the air duct and the cavity 23 of the main shell 2. During the operation of the power tool 1000, cold air can flow in from the air inlet 31 and enter the cavity 23 through the air passage 24 to cool the running motor 300. At the same time, a first filter 4 is provided at the air passage 24 to filter large particulate impurities in the airflow, thereby preventing large particulate impurities in the cold airflow from damaging the motor 300 and extending the service life of the motor 300.

[0050] It should be noted that the axial direction F1 mentioned in this utility model usually refers to the direction of the axis of the output shaft of motor 300; the radial direction usually refers to the radial direction of the output shaft of motor 300.

[0051] Please see Figure 4 and Figure 5 The first filter section 4 includes a grid baffle 41 arranged in a mesh pattern. The grid baffle 41 is disposed on the main housing 2 and located at the air passage 24. That is, the grid baffle is disposed at the air passage 24, which is equivalent to the arrangement of several mesh holes at the opening of the air passage 24.

[0052] It is known that the design of multiple mesh openings can provide a large ventilation area, allowing air to pass smoothly through the air inlet 24. The evenly distributed mesh openings allow air to enter at multiple points simultaneously, which can more effectively improve air intake efficiency and ensure sufficient air supply compared to other shapes of air inlets. At the same time, after the air enters through each mesh opening, it will mix and diffuse to a certain extent, thereby reducing the unevenness of air intake and avoiding situations where the local airflow is too large or too small, providing stable and uniform airflow conditions for the heat dissipation of the motor 300. Furthermore, the grille baffle 41 itself has a certain filtering function, which can block some larger dust particles and debris from entering the cavity 23, thereby preventing large particles of impurities from damaging the motor 300 and extending the service life of the power tool 1000.

[0053] In one embodiment, the air inlet 31 is configured as an elongated hole. It is known that an elongated hole has obvious directionality and has a good air guiding effect. At the same time, by setting the width of the elongated hole in its short axis direction, the elongated hole can filter large particulate impurities. Moreover, compared with circular or square holes, elongated holes can better distribute stress in some cases and enhance the local structural strength of the rear cover 3.

[0054] Furthermore, the width of the air inlet 31 in the direction of its minor axis is set to W1; the mesh of the grille baffle 41 is set to elongated holes, and the width of the mesh in the direction of its minor axis is set to W2, where 0.5 < W2 / W1 < 0.7; that is, the width of the mesh W2 is greater than 0.5 times W1, so that the mesh will not affect the air intake effect due to its small width; at the same time, the width of the mesh W2 is less than 0.7 times W1, so when the cold air flows in from the air inlet 31, the elongated air inlet 31 will filter large particles of impurities for the first time; when the cold air passes through the mesh of the grille baffle 41, the narrower mesh will filter the particles of impurities in the cold air a second time, thus preventing large particles of impurities from entering the cavity 23, thereby preventing large particles of impurities from damaging the motor 300, and thus extending the service life of the power tool 1000.

[0055] This utility model does not impose specific limitations on the arrangement of the mesh holes in the grille baffle 41. The mesh holes of the grille baffle 41 are set as elongated holes. In one embodiment, the short axis of the mesh holes is arranged along the circumference of the main housing 2, and the long axis of the mesh holes is arranged along the axial direction F1 of the main housing 2; in another embodiment, please refer to... Figures 2 to 5 The short axis of the mesh is arranged along the axial direction F1 of the main housing 2, and the long axis of the mesh is arranged along the circumference of the main housing 2.

[0056] This utility model does not impose specific limitations on the arrangement of the grille baffle 41. The grille baffle 41 can be set as an independent component and installed and connected to the main housing 2; or the grille baffle 41 and the main housing 2 can be integrally formed.

[0057] To simplify the assembly process of the housing assembly 100, in one embodiment, the grille baffle 41 is integrally formed with the main housing 2. The main housing 2 is usually made of plastic by injection molding. Integrating the grille baffle 41 with the main housing 2 by injection molding can reduce the assembly steps of the grille baffle 41, thereby simplifying the assembly process of the housing assembly 100.

[0058] Continuing from the above, the inner cavity of the main housing 2 is used to house the motor 300, which is configured as a brushed motor. The output shaft of the brushed motor passes through the first end 21 and extends into the head housing 1. Also, please refer to... Figures 2 to 5 The main housing 2 has a through groove 25 near its second end 22, which connects to the cavity 23. The carbon brush assembly 302 of the brushed motor 300 can be accommodated at least partially within the through groove 25. Specifically, the main housing 2 has mounting ribs 27 at positions corresponding to the through groove 25, which are used to fix the carbon brush assembly 302.

[0059] Specifically, the carbon brush assembly 302 of the brushed motor 300 is usually arranged in pairs, that is, there are two; correspondingly, the main housing 2 is provided with two through slots 25, which are arranged opposite to each other in the radial direction of the main housing 2, and the two carbon brush assemblies 302 of the brushed motor 300 can be respectively accommodated in the two through slots 25.

[0060] It is understandable that the carbon brush assembly 302 of the brushed motor 300 is at least partially housed in the through groove 25. When the motor 300 is air-cooled, the carbon brush assembly 302 in the through groove 25 can also play a certain role in dust prevention and filtration, thereby preventing large particles of impurities from entering the cavity 23 from the through groove 25 and damaging the motor.

[0061] Please see Figures 2 to 5 The main housing 2 has an air vent 24 near its second end 22. In the radial direction of the main housing 2, the air vent 24 corresponds to the position of the commutator 301 of the brushed motor 300. After the rear cover 3 is removed, the commutator 301 of the brushed motor 300 can be exposed at least partially through the air vent 24. Thus, after cold air enters the air duct from the air inlet 31, it can enter the cavity 23 through the air vent 24, thereby cooling the motor 300. In this way, while cooling the motor 300, the internal space of the main housing 2 can be fully utilized, making the structure of the power tool 1000 more compact.

[0062] Specifically, the main housing 2 is provided with two air passage holes 24, which are arranged opposite each other in the radial direction of the main housing 2. The partial position of the commutator 301 of the brushed motor 300 can be exposed from the two air passage holes 24 respectively.

[0063] This invention does not impose specific restrictions on the arrangement of the through slots 25 and the air vents 24. Specifically, the two through slots 25 and the two air vents 24 are arranged at intervals along the circumference of the main housing 2, and the through slots 25 and the air vents 24 are arranged alternately, which is a reasonable layout and can maximize the cooling and filtration effects.

[0064] Furthermore, a first filter section 4 is provided at each air passage 24, that is, the first filter section 4 is arranged opposite to the commutator 301 of the brushed motor 300. By providing two first filter sections 4, not only can the air intake at the air passage 24 be increased, but also large particulate impurities in the airflow can be filtered before the cold air enters the cavity 23 from the air passage 24, thereby preventing large particulate impurities in the cold airflow from damaging the motor 300 and thus extending the service life of the motor 300.

[0065] In one embodiment, the main housing 2 is provided with two reinforcing ribs 26 at the position corresponding to each air passage 24. The two reinforcing ribs 26 are disposed around the air passage 24, and the arrangement direction of the two reinforcing ribs 26 is perpendicular to the arrangement direction of the two through grooves 25. By providing the reinforcing ribs 26, the strength of the main housing 2 at the position of the air passage 24 is increased. Specifically, the first filter part 4 is integrally disposed between the two reinforcing ribs 26.

[0066] Specifically, an arc-shaped chamfer is provided at the connection between the first filter section 4 and the reinforcing rib 26.

[0067] In one embodiment, please refer to Figures 2 to 5 The air inlet 31 includes at least one set of side air inlets located on the peripheral sidewall of the rear cover 3. Each side air inlet includes a first air inlet 311 and a second air inlet 312. The first air inlet 311 and the second air inlet 312 are spaced apart circumferentially along the rear cover 3. The first air inlet 311 is arranged in a grid pattern, and the second air inlet 312 is an elongated hole with its long axis arranged along the axial direction F1 of the rear cover 3. During operation of the power tool 1000, cool air can enter the air duct through the first air inlet 311 and the second air inlet 312, thus increasing the air volume in the air duct and improving the cooling effect.

[0068] Specifically, each set of side air inlets includes two second air inlets 312, which are distributed circumferentially on both sides of the first air inlet 311 along the main housing 2; thus, the air intake of the side air inlets can be further increased.

[0069] This invention does not impose a specific limitation on the number of side air inlets; one, two, or three sets of side air inlets can be provided. In one embodiment, two sets of side air inlets are provided, along with two air passage holes 24 on the main housing 2. The two sets of side air inlets are arranged opposite each other in the radial direction of the main housing 2, and the arrangement direction of the two sets of side air inlets is the same as the arrangement direction of the two air passage holes 24. In this way, the cold air flows into the air duct from the side air inlets and enters the air passage holes 24. The side air inlets and air passage holes 24 arranged on the same side make the flow of cold air smoother.

[0070] Continuing from the above, the first air inlet 311 is arranged in a grid pattern, which allows for a larger air intake, thus forming the main air intake area on the rear cover 3. To improve heat dissipation, the area of ​​the first air inlet 311 is set to be larger than that of the second air inlet 312. During the operation of the power tool 1000, for example, when the grinding wheel of an angle grinder is cutting the workpiece, the rapid friction of the grinding wheel against the workpiece generates a large amount of dust and impurities. Large particles of impurities can be filtered through the grid gap of the first air inlet 311 and the first filter section 4 in sequence; however, dust will still enter the cavity 23 with the cold airflow, thereby damaging the motor 300.

[0071] Please see Figure 2 In one embodiment, the housing assembly 100 further includes a second filter section, which is positioned corresponding to the first air inlet 311 to filter small particulate impurities and dust in the cold airflow.

[0072] Specifically, the second filter section is configured as a dust filter 5, which is disposed on the inner wall of the rear cover 3 and positioned corresponding to the first air inlet 311, completely covering the first air inlet 311; the curved shape of the dust filter 5 is adapted to the curved shape of the inner wall of the rear cover 3. The area of ​​the dust-blocking mesh on the dust filter 5 is much smaller than the area of ​​the grid holes of the first air inlet 311.

[0073] In one exemplary embodiment, the dust filter 5 includes a plurality of crisscrossing dust-blocking strips, which are used to enclose and form a plurality of dust-blocking mesh openings. The dust-blocking mesh openings can be polygonal, such as rhombus, square, hexagon, etc.

[0074] To further increase the air intake in the duct, in one embodiment, the rear cover 3 has a rear end 32 facing away from the main housing 2 in its axial direction F1; the air inlet 31 includes at least one end air inlet 313, the end air inlet 313 is disposed at the rear end 32, the end air inlet 313 is configured as an elongated hole, and the direction of its long axis is perpendicular to the axial direction F1 of the rear cover 3.

[0075] As described above, the main housing 2 is provided with two air passage holes 24. In this embodiment, two end air inlets 313 are provided, arranged side by side along the radial direction of the rear cover 3, and the arrangement direction of the two end air inlets 313 is the same as the arrangement direction of the two air passage holes 24. In this way, the cold air flows into the air duct from the end air inlets 313 and enters the air passage holes 24. The end air inlets 313 and air passage holes 24 arranged on the same side make the flow of cold air smoother.

[0076] In one embodiment, the head shell 1 is connected to the cavity 23, and the head shell 1 is provided with an air outlet 11 that connects to its interior. During the operation of the power tool 1000, the cold air flows into the air duct from the air inlet 31 on the rear cover 3. The cold air enters the cavity 23 through the air outlet 24 and the through groove 25 on the main housing 2, and after cooling the motor in the cavity 23, the hot air flows to the head shell 1 and flows out from the air outlet 11, thereby forming a cooling flow path in the housing assembly to cool the motor.

[0077] Secondly, embodiments of this application provide an electric tool 1000; please refer to [link to relevant documentation]. Figures 8 to 10 The power tool 1000 includes a housing assembly 100, a working head 200, and a motor 300. The housing assembly 100 includes a head shell 1, a main housing 2, and a rear cover 3 connected in sequence. The working head 200 is disposed on the head shell 1. The motor 300 is disposed on the main housing 2 and is drivenly connected to the working head 200.

[0078] It should be noted that the housing assembly 100 is configured as described above, which includes all the technical features of the housing assembly 100. Therefore, the power tool 1000 also includes all the technical features of the housing assembly 100, and thus has the technical effects brought about by all the technical features described above.

[0079] In one embodiment, the power tool 1000 further includes a grip handle 400 disposed on the housing assembly 100. The grip handle 400 is connected to the head shell 1 of the housing assembly 100. The grip handle 400 is set at an angle to the main housing 2, which makes it convenient for the user to hold the main housing 2 and the grip handle 400 with both hands respectively, and the operation is more stable.

[0080] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A housing assembly for use in power tools, characterized in that, include: Head housing, used to mount the working head; A main housing having opposing first and second ends in its axial direction, the first end being connected to the head housing, the main housing forming a cavity for accommodating the motor; and, The rear cover is provided on the second end of the main housing and a portion of it near the second end. An air duct is formed between the inner wall of the rear cover and the outer wall of the main housing. An air inlet is provided on the rear cover to communicate with the air duct. The main housing has an air vent near its second end to connect the cavity with the air duct. The housing assembly also includes a first filter, which is provided corresponding to the air vent.

2. The housing assembly according to claim 1, characterized in that, The first filter section includes a mesh-like grid baffle, which is disposed on the main housing and located at the air passage.

3. The housing assembly according to claim 2, characterized in that, The air inlet is configured as an elongated hole, and the width of the air inlet in the direction of its minor axis is set to W1; The mesh of the grid baffle is set as an elongated hole, and the width of the mesh in the direction of its minor axis is set as W2, where 0.5 < W2 / W1 < 0.

7.

4. The housing assembly according to claim 2, characterized in that, The mesh of the grid baffle is configured as elongated holes, with the short axis of the mesh arranged along the axial direction of the main housing and the long axis of the mesh arranged along the circumferential direction of the main housing; or, the short axis of the mesh is arranged along the circumferential direction of the main housing and the long axis of the mesh is arranged along the axial direction of the main housing.

5. The housing assembly according to claim 2, characterized in that, The grille baffle is integrally formed with the main housing; or, the grille baffle is set as an independent component.

6. The housing assembly according to claim 1, characterized in that, The motor of the power tool is configured as a brushed motor; In the radial direction of the main housing, the air vent corresponds to the commutator of the brushed motor, and the first filter is disposed opposite to the commutator of the brushed motor.

7. The housing assembly according to claim 6, characterized in that, A through groove is provided near the second end of the main housing. The through groove connects to the cavity and is arranged circumferentially with the air passage hole along the main housing. The carbon brush assembly of the brushed motor is at least partially housed in the through groove.

8. The housing assembly according to claim 1, characterized in that, The air inlet includes at least one set of side air inlets located on the peripheral sidewall of the rear cover. The side air inlets include a first air inlet and a second air inlet. The first air inlet and the second air inlet are arranged at intervals along the circumference of the rear cover. The first air inlet is arranged in a grid pattern, and the second air inlet is an elongated hole with its long axis arranged along the axial direction of the rear cover.

9. The housing assembly according to claim 1, characterized in that, The rear cover has a rear end that is axially opposed to the main housing; The air inlet includes at least one end air inlet, which is located at the rear end and is an elongated hole with its long axis perpendicular to the axial direction of the rear cover.

10. A power tool, characterized in that, include: The housing assembly as described in any one of claims 1-9, the housing assembly comprising a head shell, a main shell, and a rear cover connected in sequence; A working head is disposed on the head shell; and, The motor is located in the main housing and is driven by the working head.

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