Motor and electric tool

Abstract

The utility model relates to the technical field of electric tools, in particular to a motor and an electric tool. The electric tool comprises a motor, the motor comprises a rotor, a coil and a dustproof assembly, and a first clamping part is arranged at one axial end of the rotor; the coil is arranged on the rotor; a second clamping part is arranged at the end of the dustproof assembly, the dustproof assembly is assembled at the axial end of the rotor, and the first clamping part and the second clamping part are clamped with each other. According to the motor, dust entering from the assembly position of the dustproof assembly and the rotor can be reduced, so that the protection effect on the coil is improved, the problem that the coil is still easily damaged by the entering dust is effectively solved, and the service life of the motor and the service life of the corresponding electric tool are prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a motor and an electric tool. Background Art

[0002] Electric tools such as angle grinders, marble machines, electric hammers, and polishers all require motors to provide power; the motor includes a rotor and a winding wire assembled on the rotor. When electric tools such as angle grinders, marble machines, electric hammers, and polishers are operated under dusty conditions (e.g., iron powder, cement powder), the dust can easily enter the tool and cause damage to the winding wire, resulting in rotor failure and shortening the tool's service life.

[0003] In order to improve the problem of the motor's windings being easily damaged by dust, the related technology provides a birdcage-shaped dust cover for the rotor, so that the dust cover forms a barrier to prevent dust from hitting the windings wrapped under the birdcage-shaped dust cover; however, the dust cover provided by the related technology cannot be completely fitted to the rotor end plate when pressed onto the axial end of the rotor, thereby forming an annular gap around the circumference of the rotor between the rotor and the dust cover, and dust can easily enter through the annular gap to damage the windings and the rotor. Utility Model Content

[0004] The purpose of the utility model is to provide a motor and an electric tool, which can reduce the dust entering from the assembly of the dustproof component and the rotor to improve the protection effect of the winding package, that is, effectively improve the problem that the winding package is still easily damaged by the dust entering, and extend the service life of the motor and the corresponding electric tool.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a motor, comprising:

[0007] A rotor, wherein a first clamping portion is provided at one axial end of the rotor;

[0008] A coil package, the coil package is arranged on the rotor; and

[0009] The dustproof component has a second engaging portion at its end, the dustproof component is assembled at the axial end of the rotor, and the first engaging portion and the second engaging portion are engaged with each other.

[0010] In an optional embodiment, the second engaging portion is a slot; the motor also includes a slot wedge, which is arranged on the rotor, and the end of the slot wedge extends axially relative to the end of the rotor to form a first engaging portion, which engages with the slot.

[0011] In an optional embodiment, the dustproof assembly includes a dustproof cover and a fan blade; a second clamping portion is provided at one end of the dustproof cover, and the other end of the dustproof cover is assembled on the fan blade.

[0012] In an optional embodiment, the dust cover includes a first connecting ring, a second connecting ring and a plurality of dust-proof ribs, both ends of the plurality of dust-proof ribs are respectively connected to the first connecting ring and the second connecting ring, and the plurality of dust-proof ribs are circumferentially spaced around the first connecting ring, the first connecting ring is assembled on the fan blade, and the second connecting ring is provided with a second clamping portion.

[0013] In an optional embodiment, the second connecting ring and the first connecting ring are coaxially distributed, and the diameter of the second connecting ring is larger than the diameter of the first connecting ring; and the dustproof ribs are obliquely distributed relative to the axis of the rotor.

[0014] In an optional embodiment, the dustproof rib projected on the set plane and the diameter of the second connecting ring projected on the set plane form a set angle, and the set angle is an acute angle; the set plane is perpendicular to the axis of the rotor.

[0015] In an optional embodiment, the acute angle is 10-40°.

[0016] In an optional embodiment, the dust cover is plugged into the fan blade.

[0017] In an optional embodiment, the fan blade is provided with an axial hole, the rotor is provided with a rotor shaft, and the rotor shaft is inserted into the axial hole.

[0018] In a second aspect, the utility model provides an electric tool, comprising the motor of any one of the aforementioned embodiments.

[0019] The beneficial effects of the motor of the utility model embodiment include: the motor provided by the utility model embodiment includes a rotor, a coil and a dustproof assembly, the coil is arranged on the rotor, a first clamping portion is arranged at one axial end of the rotor, a second clamping portion is arranged at the end of the dustproof assembly, the dustproof assembly is assembled at the axial end of the rotor, and the first clamping portion and the second clamping portion are mutually engaged. By arranging the first clamping portion at one axial end of the rotor and the second clamping portion at the end of the dustproof assembly, and making the first clamping portion and the second clamping portion mutually engaged, the problem of an annular gap formed around the circumference of the rotor due to the dustproof assembly being unable to fully fit when assembled at the end of the rotor can be improved, that is, the mutually engaged first clamping portion and the second clamping portion can be used to form a separation at the joint between the dustproof assembly and the rotor, so as to reduce the dust entering from the joint between the dustproof assembly and the rotor, thereby improving the protection effect of the coil, that is, effectively improving the problem that the coil is still easily damaged by the dust entering, and extending the service life of the motor.

[0020] The beneficial effects of the electric tool provided by the embodiment of the utility model include: the electric tool provided by the embodiment of the utility model includes all the beneficial effects of the aforementioned motor, for example: improving the protection effect on the winding, that is, effectively improving the problem that the winding is still easily damaged by dust that enters, extending the service life of the motor, and improving the service life of the electric tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a partial structural schematic diagram of a motor in an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the dustproof component in the embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the dust cover in the embodiment of the utility model at a first viewing angle;

[0025] Figure 4 It is a schematic diagram of the structure of the dust cover in the embodiment of the utility model at a second viewing angle;

[0026] Figure 5 This is a schematic diagram of the structure of the fan blade in the embodiment of the utility model;

[0027] Figure 6 for Figure 1 Cross-sectional view along the AA direction.

[0028] Icons: 100-rotor; 110-slot wedge; 111-first engaging part; 120-rotor shaft; 200-dustproof assembly; 201-second engaging part; 210-dustproof cover; 211-first connecting ring; 212-second connecting ring; 213-dustproof rib; 214-insertion hole; 220-fan blade; 221-plug-in column; 222-blade; 223-shaft hole; 231-first plug-in part; 232-second plug-in part; α-set angle; H-set plane. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Please refer to Figure 1 This embodiment provides an electric tool, which may be an electric hammer. Of course, in other embodiments, the electric tool may also refer to an angle grinder, a marble machine, a polishing machine, etc., which are not specifically limited here. The following will take the electric hammer as an example for detailed description.

[0035] The electric tool of this embodiment includes a motor and an electric hammer head. The output shaft of the motor is drivingly connected to the electric hammer head to drive the electric hammer head to move.

[0036] Please refer to Figure 1 The motor includes a rotor 100 and a winding package arranged on the rotor 100; when the power tool is operated under dusty conditions (for example, iron powder, cement powder), the dust can easily enter the tool and collide with the winding package, causing damage to the winding package, thereby causing the rotor 100 to fail and shortening the service life of the tool.

[0037] In order to improve the above problems, the motor also includes a dustproof component 200, which is arranged at one end of the rotor 100 to cover the outside of the winding to prevent dust from entering and hitting the winding, thereby improving the problem of easy damage to the winding to extend the service life of the motor.

[0038] Furthermore, a first engaging portion 111 is provided at one axial end of the rotor 100, and a second engaging portion 201 is provided at the end of the dustproof assembly 200. The dustproof assembly 200 is assembled at the axial end of the rotor 100, and the first engaging portion 111 and the second engaging portion 201 are engaged with each other. By providing a first engaging portion 111 at one axial end of the rotor 100 and a second engaging portion 201 at the end of the dustproof component 200, and making the first engaging portion 111 and the second engaging portion 201 engage with each other, the problem of an annular gap formed around the circumference of the rotor 100 due to the dustproof component 200 not being able to fully fit when assembled on the end of the rotor 100 can be improved. That is, the first engaging portion 111 and the second engaging portion 201 that engage with each other can be used to form a partition at the joint between the dustproof component 200 and the rotor 100 to reduce dust entering from the joint between the dustproof component 200 and the rotor 100, thereby improving the protection effect of the winding, that is, effectively improving the problem that the winding is still easily damaged by the entering dust, thereby extending the service life of the motor and the power tool.

[0039] Furthermore, the second engaging portion 201 is a slot; the motor further comprises a slot wedge 110, which is disposed on the rotor 100, and the end of the slot wedge 110 extends relative to the end of the rotor 100 along the axial direction of the rotor 100 to form a first engaging portion 111, and the first engaging portion 111 engages with the slot. Using the protruding end of the slot wedge 110 as the first engaging portion 111 can reduce the difficulty of producing the motor, reduce the difficulty of demoulding the rotor 100, and improve production efficiency.

[0040] The number of slot wedges 110 and corresponding slots can be selected as needed, for example: one, two, three, ten, twelve, etc., which is not specifically limited here.

[0041] In a preferred embodiment, the rotor 100 is provided with a plurality of slot wedges 110, which are arranged in sequence and spaced apart along the circumference of the rotor 100; the dustproof assembly 200 is provided with a plurality of slots, and the plurality of slot wedges 110 are engaged with the plurality of slots in a one-to-one correspondence. Such an arrangement can fully reduce the assembly gap between the dustproof assembly 200 and the rotor 100, thereby reducing the dust entering and effectively improving the problem of coil damage.

[0042] Optionally, when the number of slot wedges 110 and the number of card slots is greater than or equal to two, the plurality of slot wedges 110 and the plurality of card slots are evenly distributed.

[0043] It should be noted that the manner in which the slot wedge 110 is assembled to the rotor 100 is similar to the related art and is not specifically limited here.

[0044] Please refer to Figure 1 and Figure 2 The dustproof assembly 200 of this embodiment includes a dustproof cover 210 and a fan blade 220. One end of the dustproof cover 210 is provided with a second engaging portion 201, and the other end of the dustproof cover 210 is assembled to the fan blade 220. In this way, the dustproof cover 210 can be used to reliably reduce the entry of dust and improve the problem of dust-induced damage to the coil. The rotation of the fan blade 220 can also be used to blow wind toward the rotor 100 to achieve the purpose of heat dissipation, thereby extending the service life of the motor.

[0045] For further information, please refer to Figure 3 The dust cover 210 includes a first connecting ring 211, a second connecting ring 212 and a plurality of dustproof ribs 213. Both ends of the plurality of dustproof ribs 213 are respectively connected to the first connecting ring 211 and the second connecting ring 212, and the plurality of dustproof ribs 213 are distributed at intervals around the circumference of the first connecting ring 211. The first connecting ring 211 is assembled on the fan blade 220, and the second connecting ring 212 is provided with a second clamping portion 201. With such a configuration, the dust cover 210 is roughly in the shape of a bird cage, and the dustproof ribs 213 can prevent dust and other impurities from impacting the coil, thereby improving the problem of easy damage to the coil, and increasing the service life of the coil, the rotor 100 and the motor.

[0046] It should be noted that the number of the dustproof ribs 213 can be selected according to needs, for example: eight, ten, twelve, fifteen, etc., and is not specifically limited here.

[0047] The connection methods of the dustproof rib 213 and the first connecting ring 211 and the second connecting ring 212 include but are not limited to integral molding, bonding, and clamping.

[0048] Optionally, see Figure 4The second connecting ring 212 and the first connecting ring 211 are coaxially arranged, and the diameter of the second connecting ring 212 is greater than the diameter of the first connecting ring 211; the dustproof ribs 213 are inclined relative to the axis of the rotor 100. With such an arrangement, the appearance of the dust cover 210 is roughly truncated, and the inner cavity is expanded, which is conducive to demoulding the dust cover 210, reduces the difficulty of producing the dust cover 210, and improves production efficiency.

[0049] In order to speed up dust discharge, the arrangement of the dust-proof ribs 213 of the dust cover 210 is optimized; optionally, the dust-proof ribs 213 projected on the set plane H intersect with the diameter of the second connecting ring 212 projected on the set plane H and form a set angle α, and the set angle α is an acute angle; the set plane H is perpendicular to the axis of the rotor 100.

[0050] Furthermore, the angle is set to 10-40°, for example: 10°, 15°, 20°, 25°, 30°, 35°, 40°.

[0051] Please refer to Figure 1 When assembling the dust cover 210 on the rotor 100, it is necessary to align and engage the first engaging portion 111 with the corresponding second engaging portion 201 in the circumferential direction of the rotor 100, which makes the alignment and assembly operations difficult and difficult to achieve automated assembly. In order to improve the above problems, in this embodiment, the dust cover 210 and the fan blade 220 are plugged and assembled into one, and then the dustproof assembly 200 is assembled as a whole on the rotor 100.

[0052] Further, please refer to Figure Figure 4 and Figure 5 The fan blade 220 is provided with a first plug-in portion 231, and the dust cover 210 is provided with a second plug-in portion 232, and the first plug-in portion 231 is plugged with the second plug-in portion 232; the fan blade 220 is provided with an axial hole 223, and the rotor shaft 120 provided in the rotor 100 is plugged into the axial hole 223. In this way, after the dust cover 210 is assembled on the fan blade 220, the dustproof assembly 200 assembled into one can be modularly assembled on the rotor 100, which reduces the difficulty of assembly and improves the assembly efficiency.

[0053] Optionally, the assembly position of the fan blade 220 on the rotor shaft 120 is compatible with the assembly position of the dust cover 210 on the rotor 100, that is, the assembly position of the fan blade 220 on the rotor shaft 120 is compatible with the position where the second clamping portion 201 provided on the dust cover 210 is clamped with the first clamping portion 111 of the rotor 100; such a configuration makes it convenient for the dust cover 210 to be assembled on the fan blade 220 and the dustproof assembly 200 to be assembled on the rotor 100 as a whole after the dust cover 210 is assembled on the fan blade 220. It is only necessary to align the position of the fan blade 220 on the rotor shaft 120, and the dust cover 210 can be simultaneously ensured to be aligned with the position where it is assembled on the rotor 100, that is, to ensure that the second clamping portion 201 can be aligned and clamped with the first clamping portion 111, thereby improving the assembly efficiency and realizing the automatic assembly of the dust cover when the fan blade 220 is automatically assembled.

[0054] Optionally, the first plug-in portion 231 is a protrusion connected to the fan blade 220, and the second plug-in portion 232 is a groove provided in the first connecting ring 211; the protrusion and the groove are plug-fitted.

[0055] The number of protrusions and grooves can be selected as needed. In this embodiment, the number of protrusions and grooves is two, and the two protrusions are plugged into the two grooves in a one-to-one correspondence. Of course, in other embodiments, the number of protrusions and grooves can also be one, three, four, etc., which is not specifically limited here.

[0056] Optionally, see Figure 4 , Figure 5 and Figure 6 The fan blade 220 includes a plug-in column 221 and a plurality of blades 222. The plurality of blades 222 are all connected to the plug-in column 221 and are sequentially spaced around the circumference of the plug-in column 221. The protrusion is connected to the outer circumference of the plug-in column 221, and the plug-in column 221 is provided with an axial hole 223. The first connecting ring 211 is provided with a plug-in hole 214, and the plug-in hole 214 is a stepped hole, and the hole wall of the plug-in hole 214 is provided with a groove. The plug-in column 221 is plugged into the plug-in hole 214 and abuts against the stepped surface of the plug-in hole 214. The rotor shaft 120 sequentially passes through the second connecting ring 212 and the plug-in hole 214 and is plugged into the axial hole 223. In this way, the reliability of the dust cover 210 being assembled on the fan blade 220 can be guaranteed.

[0057] Optionally, the rotor shaft 120 and the shaft hole 223 are interference fit; or, the rotor shaft 120 may also be snap-fitted or threadedly connected to the shaft hole 223, etc., which is not specifically limited here.

[0058] It should be noted that other structures and working principles of the motor are similar to those in the related art and will not be elaborated here.

[0059] The assembly process of the motor of this embodiment includes: assembling the dust cover 210 on the fan blade 220 and inserting the protrusion into the groove; assembling the fan blade 220 on the rotor shaft 120 of the rotor 100 and matching the first connecting part with the second connecting part, so that the dust cover 210 can be aligned and assembled simultaneously.

[0060] In summary, the motor of the utility model can be used for electric tools such as angle grinders, marble machines, electric hammers, and polishers, and the motor can reduce the dust entering from the assembly point of the dustproof component 200 and the rotor 100 to improve the protection effect on the winding package, that is, effectively improve the problem that the winding package is still easily damaged by the dust that enters, thereby extending the service life of the motor and the corresponding electric tool.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor, characterized in that: include: A rotor (100), wherein a first engaging portion (111) is provided at one axial end of the rotor (100); a coil package, the coil package being arranged on the rotor (100); and A dustproof component (200), wherein a second engaging portion (201) is provided at the end of the dustproof component (200), the dustproof component (200) is assembled on the axial end of the rotor (100), and the first engaging portion (111) and the second engaging portion (201) are engaged with each other.

2. The motor according to claim 1, characterized in that The second engaging portion (201) is a slot; the motor further comprises a slot wedge (110), the slot wedge (110) is arranged on the rotor (100), and the end of the slot wedge (110) protrudes relative to the end of the rotor (100) along the axial direction of the rotor (100) to form the first engaging portion (111), and the first engaging portion (111) is engaged with the slot.

3. The motor according to claim 1, characterized in that The dustproof assembly (200) comprises a dustproof cover (210) and a fan blade (220); one end of the dustproof cover (210) is provided with the second clamping portion (201), and the other end of the dustproof cover (210) is assembled on the fan blade (220).

4. The motor according to claim 3, characterized in that The dust cover (210) comprises a first connecting ring (211), a second connecting ring (212) and a plurality of dust-proof ribs (213); both ends of the plurality of dust-proof ribs (213) are respectively connected to the first connecting ring (211) and the second connecting ring (212); and the plurality of dust-proof ribs (213) are distributed at intervals around the circumference of the first connecting ring (211); the first connecting ring (211) is assembled on the fan blade (220); and the second connecting ring (212) is provided with the second clamping portion (201).

5. The motor according to claim 4, characterized in that The second connecting ring (212) and the first connecting ring (211) are coaxially distributed, and the diameter of the second connecting ring (212) is greater than the diameter of the first connecting ring (211); and the dustproof ribs (213) are obliquely distributed relative to the axis of the rotor (100).

6. The motor according to claim 5, characterized in that A diameter of the dustproof rib (213) projected onto a set plane and a diameter of the second connecting ring (212) projected onto the set plane form a set angle, and the set angle is an acute angle; the set plane is perpendicular to the axis of the rotor (100).

7. The motor according to claim 6, characterized in that The acute angle is 10-40°.

8. The motor according to claim 3, characterized in that The dust cover (210) is plugged into the fan blade (220).

9. The motor according to claim 8, characterized in that The fan blade (220) is provided with an axial hole (223), and the rotor (100) is provided with a rotor shaft (120), and the rotor shaft (120) is inserted into the axial hole (223).

10. An electric tool, characterized in that: A motor comprising any one of claims 1 to 9.

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