CN218697214U - Motor assembly of electric tool and electric tool - Google Patents

Abstract

The utility model provides an electric tool's motor element and electric tool, motor element includes: the driving motor is provided with a motor shaft; the connecting bracket is sleeved on the motor shaft and is rotationally connected with the motor shaft; when the motor assembly is installed in the installation shell of the electric tool, the connecting support is matched with the limiting groove of the installation shell so that the motor shaft can rotate around the axis of the motor shaft. The utility model provides a driving motor often relies on the casing cooperation of its casing and grinder and realizes driving motor's installation, but does not have the technical problem who improves the processing of stability to driving motor's motor shaft.

Description

Motor assembly of electric tool and electric tool

Technical Field

The utility model relates to an electric tool technical field particularly, relates to an electric tool's motor element and electric tool.

Background

A sander is an electric tool used for sanding surfaces such as wooden products, metal products, plastic products, walls and the like. The handheld sander mainly comprises a sander body and two large parts of a sanding bottom plate connected with the sander body, and sanding treatment is performed on the surface of a workpiece to be machined by arranging abrasive paper on the sanding bottom plate.

However, the related art has at least one of the following technical problems: the casing cooperation that driving motor often relies on its casing and grinder and realizes the installation to driving motor, but the processing that does not improve stability to driving motor's motor shaft, the process that combines the grinder to actually treat the machined part and carry out surperficial sand light, because driving motor will play the drive effect to the sand bottom plate, make the motor shaft receive and come from the effect of treating the machined part and lead to the structure that the casing corresponds installation driving motor position to easily receive the damage, especially when driving motor's output rotational speed is great, make the installation of driving motor in the casing more unstable.

SUMMERY OF THE UTILITY MODEL

The utility model provides a driving motor often relies on the casing cooperation of its casing and grinder and realizes driving motor's installation, but does not have the technical problem who improves the processing of stability to driving motor's motor shaft.

In order to solve the above-mentioned problems, the utility model provides an electric tool's motor element, include: the driving motor is provided with a motor shaft; the connecting bracket is sleeved on the motor shaft and is rotationally connected with the motor shaft; when the motor assembly is installed in the installation shell of the electric tool, the connecting support is matched with the limiting groove of the installation shell so that the motor shaft can rotate around the axis of the motor shaft.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: apply motor element to in the installation casing of grinder, make when carrying out the processing operation, utilize the spacing accessory of linking bridge and spacing groove in order to realize spacing to the motor shaft, make the motor shaft only can rotate around its axis, it is concrete, treat the in-process that the machined part carries out surface sanding processing when the grinder, because the sand bottom plate of grinder treats the surface of machined part and extrudees and then makes the possibility that the deflection appears in the motor shaft that has increased, combine linking bridge's limiting displacement, it can only carry out rotatory stability around its axis to have improved the motor shaft, the inside of having also avoided simultaneously only leading to the motor shaft to appear the motion of the vertical direction position at skew its axis place and driving motor to cause the damage through the spacing cooperation of installation casing and driving motor's casing.

In an example of the present invention, the connection bracket includes: the connecting rotary drum is sleeved on the outer surface of the motor shaft and is arranged coaxially with the motor shaft; the limiting chuck is connected to one end, far away from the driving motor, of the connecting rotary drum and is provided with at least one clamping piece extending in the direction far away from the axis; wherein, at least one fastener is used for with spacing groove cooperation.

Compared with the prior art, the technical scheme has the following technical effects: in a concrete example, the quantity of fastener can be two, and two fasteners set up on spacing chuck passes any axis of its axle center position to the fastener has the holding surface that extends along the circumferencial direction of spacing chuck, when making fastener and spacing groove cooperate, can increase the area of contact with the spacing groove, has realized the stable cooperation of linking bridge and installation casing, and then can make and stabilize spacing effect to the motor shaft.

In an example of the present invention, the driving motor is an external rotor motor.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: specifically, the outer rotor motor is also an outer rotor brushless motor and has the characteristic of simple structure.

In an example of the present invention, the outer rotor motor includes: the outer rotor is internally provided with a rotor space; the inner stator is arranged in the rotor space, and the inner stator and the outer rotor are arranged coaxially; the connecting bracket abuts against the inner stator to restrict the inner stator from coming out of the rotor space.

Compared with the prior art, the technical scheme has the following technical effects: through the butt cooperation of linking bridge and inner stator to the condition that the inner stator is deviate from in the rotor space prevents to appear, thereby has realized outer rotor and inner stator complex stability.

In an example of the present invention, the mounting housing has a mounting groove corresponding to the outer surface of the motor assembly, and the mounting groove is communicated with a mounting space for accommodating the motor assembly in the mounting housing; the motor assembly includes: the locking assembly is arranged on the mounting groove and can be switched between a first state and a second state relative to the motor shaft so that the motor shaft can rotate or be locked.

Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: through the regulation operation to locking Assembly so that its relative motor shaft switches between first state and second state to realize rotating or locking its rotatory effect of motor shaft, it is specific, electric tool is the grinder for example, then, the motor shaft is used for driving the sand bottom plate of grinder and makes regular motion at the axis that predetermines within range relative motor shaft place, when needs change the abrasive paper that sets up on the sand bottom plate, can make locking Assembly locking motor shaft's rotation, with the degree of difficulty that reduces change abrasive paper.

In an example of the present invention, the locking assembly includes: the pressing piece is provided with a pressing end and a matching end which are oppositely arranged, and the pressing end is installed on the surface of the installation shell corresponding to the installation groove; the matching end extends into the mounting space and is matched with the motor shaft; the elastic piece is arranged between the mounting groove and the pressing end; wherein the resilient member is compressed to cause the mating end to lock the motor shaft.

Compared with the prior art, the technical scheme has the following technical effects: utilize the effect that resets of elastic component, can make the switching of locking Assembly between first state and second state realize by its automation, make holistic regulation efficiency improve, the degree of difficulty of adjusting the switching between two states has been reduced, combine the structural feature that the elastic component set up simultaneously, for example make it when receiving the extrusion and appear being compressed deformation, make the cooperation end move towards the direction that is close to the motor shaft, and then realize the contact with the motor shaft and restrict its rotation, when the operator releases the action of pressing down to the pressing down piece, the elastic component can be under the reset power effect of its self reply initial condition again, make cooperation end and motor shaft alternate segregation, thereby make the motor shaft rotate again, then, can make the motor shaft carry out rotatory locking operation and make its pivoted unblock operation all simple and reliable about the aforesaid, and because of the existence of elastic component, avoided pressing down the pressing down piece and mistakenly touched and directly lead to the motor shaft to get into the circumstances of being locked and appear, thereby reduced the influence to the normal operating of grinder, the injury of driving motor has also been reduced simultaneously.

In an example of the present invention, the motor shaft includes: the first motor shaft is at least partially arranged in the driving motor; the output shaft is in transmission connection with one end, far away from the driving motor, of the first motor shaft; and at least one inserting hole matched with the matching end is arranged on the circumferential surface of the output shaft.

Compared with the prior art, the technical scheme has the following technical effects: the matching between the plug hole and the locking component is more stable and reliable.

In an example of the present invention, the output shaft includes: the connecting section is coaxially arranged with the first motor shaft and is in transmission connection with the first motor shaft; the matching section is arranged at one end of the connecting section, which is far away from the first motor shaft, and the inserting hole is formed in the matching section; wherein the plug hole extends in the radial direction of the mating segment.

Compared with the prior art, the technical scheme has the following technical effects: the stability of locking assembly and connecting axle locking cooperation has further been improved.

On the other hand, the utility model also provides an electric tool, include: a motor assembly as in any preceding example; the installation shell is internally provided with an installation space for installing the motor assembly.

Compared with the prior art, the technical scheme has the following technical effects: the technical effects corresponding to any one of the above technical solutions can be achieved, and are not described herein again.

In one example of the present invention, the electric tool is a sander; the sander includes: the output assembly is arranged at the bottom end of the mounting shell and is in transmission connection with the motor assembly; the second axis where the geometric center of the output assembly is located and the first axis of the motor shaft form a first eccentric distance.

Compared with the prior art, the technical scheme has the following technical effects: combine the actual conditions of grinder in the use, because be eccentric settings between output assembly and the motor element, make motor element behind the drive operation, can drive output assembly around first axis motion, and then realized controlling under the grinder action keeps unchangeable prerequisite at the operator, output assembly can treat to process in the machined part corresponding output assembly's the processing region and polish, the spacing cooperation of linking bridge among this technical scheme and installation casing is reunited, can make the motor shaft avoid under linking bridge's restraint and the installation casing between the position skew appears, and then reduce the installation stability of motor element in the installation casing.

Adopt the technical scheme of the utility model afterwards, can reach following technological effect:

(1) The motor assembly is applied to the installation shell of the sander, so that when the sanding machine is used for processing, the motor shaft is limited by the limiting fittings of the connecting support and the limiting groove, the motor shaft can only rotate around the axis of the motor shaft, specifically, when the sanding machine is used for sanding the surface of a workpiece to be processed, the sanding bottom plate of the sanding machine extrudes the surface of the workpiece to be processed, so that the possibility of deflection of the motor shaft is increased, the limiting effect of the connecting support is combined, the stability that the motor shaft can only rotate around the axis of the motor shaft is improved, and meanwhile, the phenomenon that the motor shaft is easy to move away from the vertical direction position of the axis of the motor shaft due to the limiting matching of the installation shell and the casing of the driving motor to damage the inside of the driving motor is avoided;

(2) The locking assembly is adjusted to be switched between a first state and a second state relative to the motor shaft, so that the motor shaft can rotate or be locked to rotate, specifically, the electric tool is a sander, then the motor shaft is used for driving a sanding bottom plate of the sander to move regularly relative to an axis where the motor shaft is located in a preset range, and when sand paper arranged on the sanding bottom plate needs to be replaced, the locking assembly can lock the rotation of the motor shaft, so that the difficulty of replacing the sand paper is reduced;

(3) Utilize the effect that resets of elastic component, can make the switching of locking subassembly between first state and second state realize by it is automatic, make holistic regulation efficiency improve, the degree of difficulty of adjusting the switching between two states is reduced, combine the structural feature that the elastic component set up simultaneously, for example make it when receiving the extrusion and appear compressed deformation, make the mating end move towards the direction that is close to the motor shaft, and then realize the contact with the motor shaft and restrict its rotation, when the operator relieves the action of pressing to the pressing member, the elastic component can be under the reset force effect of its self reply initial condition again, make mating end and motor shaft alternate segregation, thereby make the motor shaft can rotate again, then, can make the motor shaft carry out rotatory locking operation and make its pivoted unblock operation all simple and reliable about the aforesaid, and because of the existence of elastic component, avoided touching by mistake the pressing member and directly lead to the motor shaft to get into the circumstances locked to appear, thereby the influence of the normal operating of grinder has been reduced, the injury of driving motor has also been reduced simultaneously.

Drawings

Fig. 1 is a schematic view illustrating a motor assembly and a mounting housing of an electric tool according to an embodiment of the present invention.

Fig. 2 is a schematic view of the mounting housing and the motor assembly shown in fig. 1 from another perspective.

Fig. 3 is a schematic structural view of the motor assembly in fig. 2.

Fig. 4 is a schematic view of the mating connection of the mounting housing and the locking assembly from a further perspective of fig. 1.

Fig. 5 isbase:Sub>A sectional view taken along the linebase:Sub>A-base:Sub>A in fig. 4.

Description of the reference numerals:

100-a motor assembly; 10-a drive motor; 11-motor shaft; 111-a first motor shaft; 112-an output shaft; 113-a plug hole; 12-an outer rotor motor; 121-an inner stator; 122-outer rotor; 20-connecting the stent; 21-connecting the rotating cylinder; 22-a limiting chuck; 23-a catch; 30-a locking assembly; 31-pressing end; 32-a mating end; 33-an elastic member;

200-mounting a housing; 210-a limiting groove; 220-mounting groove.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

The first embodiment is as follows:

referring to fig. 1, it is a schematic diagram of a motor assembly 100 and a mounting housing 200 of an electric power tool according to an embodiment of the present invention. Referring to fig. 2 to 5, the motor assembly 100 includes, for example, a driving motor 10 and a connecting bracket 20. The driving motor 10 is provided with a motor shaft 11; the connecting bracket 20 is sleeved on the motor shaft 11, and the connecting bracket 20 is rotatably connected with the motor shaft 11; wherein, when the motor assembly 100 is mounted into the mounting housing 200 of the power tool, the connecting bracket 20 is engaged with the limiting groove 210 of the mounting housing 200 to rotate the motor shaft 11 about its axis.

In a specific example, combine this technical scheme content, with motor element 100 application to the installation casing 200 of grinder in, make when carrying out the processing operation, utilize the spacing accessory of linking bridge 20 and spacing groove 210 in order to realize spacing to motor shaft 11, make motor shaft 11 can only rotate around its axis, specifically, treat the in-process that the machined part was treated to the grinder, because the sand bottom plate of grinder treats the surface of machined part and extrudees and then makes the possibility that has increased motor shaft 11 and has appeared deflecting, combine the limiting action of linking bridge 20, improved motor shaft 11 and can only carry out rotatory stability around its axis, also avoided simultaneously only leading to motor shaft 11 to appear deviating from the motion of its axial line place's vertical direction position and the inside of driving motor 10 to cause the damage through the spacing cooperation of installation casing 200 and driving motor 10's casing easily.

Preferably, the attachment bracket 20 includes, for example, an attachment sleeve and a limit chuck 22. The connecting rotary drum 21 is sleeved on the outer surface of the motor shaft 11, and the connecting rotary drum 21 and the motor shaft 11 are arranged coaxially; the limiting chuck 22 is connected to one end of the connecting rotary drum 21 far away from the driving motor 10, and the limiting chuck 22 is provided with at least one clamping piece 23 extending in the direction far away from the axis of the motor shaft 11; the engaging member 23 is used to engage with the limiting groove 210.

In a specific example, the number of the engaging pieces 23 may be two, two engaging pieces 23 are disposed on any axis where the limiting chuck 22 passes through the axis, and the engaging pieces 23 have supporting surfaces extending along the circumferential direction of the limiting chuck 22, so that when the engaging pieces 23 are matched with the limiting groove 210, the contact area with the limiting groove 210 can be increased, stable matching between the connecting bracket 20 and the mounting housing 200 is realized, and further, a stable limiting effect on the motor shaft 11 can be achieved.

Preferably, the drive motor 10 is an external rotor motor 12. By selecting the drive motor 10 as the outer rotor motor 12, heat dissipation can be facilitated. Specifically, the outer rotor motor 12 is also a brushless motor with an outer rotor 122, and has a simple structure.

Preferably, the outer rotor motor 12 includes, for example, an outer rotor 122 and an inner stator 121. A rotor space is provided in the outer rotor 122; the inner stator 121 is arranged in the rotor space, and the inner stator 121 and the outer rotor 122 are coaxially arranged; the connection bracket 20 abuts the inner stator 121 to restrict the inner stator 121 from being withdrawn from the rotor space. By the abutting fit of the connecting bracket 20 and the inner stator 121, the inner stator 121 is prevented from being removed from the rotor space, and the stability of the fit of the outer rotor 122 and the inner stator 121 is achieved.

Preferably, the mounting housing 200 is provided with a mounting groove 220 corresponding to the outer surface of the motor assembly 100, and the mounting groove 220 is communicated with a mounting space for accommodating the motor assembly 100 in the mounting housing 200; the motor assembly 100 includes, for example, a locking assembly 30, the locking assembly 30 is disposed in the mounting groove 220, and the locking assembly 30 can be switched between a first state and a second state relative to the motor shaft 11 to enable the motor shaft 11 to rotate or be locked. Through the regulation operation to locking Assembly 30 so that it switches between first state and second state relative motor shaft 11 to realize the effect that can rotate or lock its rotation of motor shaft 11, specifically, electric tool is the grinder for example, then, motor shaft 11 is used for driving the sand bottom plate of grinder and makes regular motion relative to the axis that motor shaft 11 is located in predetermineeing the within range, when needs are changed the abrasive paper that sets up on the sand bottom plate, can make locking Assembly 30 lock the rotation of motor shaft 11, with the degree of difficulty that reduces change abrasive paper.

Preferably, the locking assembly 30 includes, for example, a pressing member and an elastic member 33. The pressing piece is provided with a pressing end 31 and a mating end 32 which are oppositely arranged, and the pressing end 31 is installed on the surface of the installation shell 200 corresponding to the installation groove 220; the mating end 32 projects into the mounting space so as to mate with the motor shaft 11; the elastic piece 33 is arranged between the mounting groove 220 and the pressing end 31; wherein the resilient member 33 is compressed to lock the mating end 32 to the motor shaft 11.

Specifically, the elastic member 33 is reset to automatically switch the locking assembly 30 between the first state and the second state, so that the overall adjustment efficiency is improved, the difficulty in adjusting the switching between the two states is reduced, and the structural characteristics of the elastic member 33 are combined, for example, when the locking assembly is compressed and deformed due to extrusion, the matching end 32 moves towards the direction close to the motor shaft 11, so that the locking assembly contacts with the motor shaft 11 to limit the rotation of the motor shaft 11, when an operator releases the pressing action on the pressing member, the elastic member 33 can separate the matching end 32 from the motor shaft 11 under the action of the reset force of the elastic member to restore the initial state, so that the motor shaft 11 can rotate, so that the locking operation and the unlocking operation of the rotation of the motor shaft 11 can be simple and reliable, and due to the existence of the elastic member 33, the situation that the motor shaft 11 is locked due to the mistaken contact of the pressing member is avoided, thereby reducing the influence on the normal operation of the sanding machine and reducing the damage of the driving motor 10

Preferably, the motor shaft 11 includes, for example, a first motor shaft 111 and an output shaft 112. At least part of the first motor shaft 111 is arranged in the driving motor 10; the output shaft 112 is drivingly connected to an end of the first motor shaft 111 away from the driving motor 10, and at least one insertion hole 113 for engaging with the mating end 32 is formed along a circumferential surface of the output shaft 112.

Preferably, the output shaft 112 includes, for example, a connecting section and a mating section. The connecting section is coaxially arranged with the first motor shaft 111 and is in transmission connection with the first motor shaft 111; the matching section is arranged at one end of the connecting section far away from the first motor shaft 111, and the inserting hole 113 is formed in the matching section; wherein the plug-in hole 113 extends in the radial direction of the mating segment.

Example two:

the present embodiment provides a power tool, and specifically, the power tool includes, for example, the motor assembly 100 and the mounting housing 200 according to the first embodiment. An installation space for installing the motor assembly 100 is provided in the installation case 200.

Preferably, the power tool may be a sander, and the sander includes, for example, an output assembly, the output assembly is disposed at the bottom end of the mounting housing 200, and the output assembly is in transmission connection with the motor assembly 100; wherein, a second axis of the geometric center of the output component forms a first eccentric distance with the first axis of the motor shaft 11.

Specifically, this embodiment can achieve the technical effect corresponding to any one of the technical solutions in the first embodiment, and details are not described here.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.

Claims (10)

1. A motor assembly for a power tool, comprising:

the driving motor is provided with a motor shaft;

the connecting bracket is sleeved on the motor shaft and is rotationally connected with the motor shaft;

when the motor assembly is installed in the installation shell of the electric tool, the connecting support is matched with the limiting groove of the installation shell so that the motor shaft can rotate around the axis of the motor shaft.

2. The electric machine assembly of claim 1, wherein the connection bracket comprises:

the connecting rotary drum is sleeved on the outer surface of the motor shaft and is arranged coaxially with the motor shaft;

the limiting chuck is connected to one end, far away from the driving motor, of the connecting rotary drum and is provided with at least one clamping piece extending in the direction far away from the axis;

wherein, at least one fastener is used for with spacing groove cooperation.

3. The motor assembly of claim 1,

the driving motor is an outer rotor motor.

4. The electric machine assembly of claim 3,

the outer rotor motor includes:

the outer rotor is internally provided with a rotor space;

the inner stator is arranged in the rotor space, and the inner stator and the outer rotor are arranged coaxially;

the connecting bracket abuts against the inner stator to restrict the inner stator from coming out of the rotor space.

5. The motor assembly of claim 1, wherein the mounting housing defines a mounting slot corresponding to an outer surface of the motor assembly, the mounting slot communicating with a mounting space in the mounting housing for accommodating the motor assembly; the motor assembly includes:

the locking assembly is arranged on the mounting groove and can be switched between a first state and a second state relative to the motor shaft so that the motor shaft can rotate or be locked.

6. The motor assembly of claim 5, wherein the locking assembly comprises:

the pressing piece is provided with a pressing end and a matching end which are arranged oppositely, and the pressing end is installed on the surface of the installation shell corresponding to the installation groove; the matching end extends into the mounting space and is matched with the motor shaft;

the elastic piece is arranged between the mounting groove and the pressing end;

wherein the resilient member is compressed to cause the mating end to lock the motor shaft.

7. The motor assembly of claim 6, wherein the motor shaft comprises:

the first motor shaft is at least partially arranged in the driving motor;

the output shaft is in transmission connection with one end, far away from the driving motor, of the first motor shaft; and at least one inserting hole matched with the matching end is arranged on the circumferential surface of the output shaft.

8. The motor assembly of claim 7, wherein the output shaft comprises:

the connecting section is coaxially arranged with the first motor shaft and is in transmission connection with the first motor shaft;

the matching section is arranged at one end of the connecting section, which is far away from the first motor shaft, and the inserting hole is formed in the matching section;

wherein the plug hole extends in the radial direction of the mating segment.

9. An electric power tool, characterized by comprising:

the electric machine assembly of any of claims 1-8;

the installation shell is internally provided with an installation space for installing the motor assembly.

10. The power tool of claim 9, wherein the power tool is a sander; the sander includes:

the output assembly is arranged at the bottom end of the mounting shell and is in transmission connection with the motor assembly;

the second axis of the geometric center of the output assembly and the first axis of the motor shaft form a first eccentric distance.

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