CN219967475U - Electric tool driven by outer rotor motor - Google Patents

Abstract

The utility model provides an electric tool driven by an external rotor motor, and belongs to the technical field of machinery. The electric tool solves the problems of large volume, large working noise, low working stability and poor heat dissipation effect of the existing electric tool. The electric tool driven by the outer rotor motor comprises a shell and a fixed support, wherein the outer rotor motor is arranged in the shell, the fixed support is nested in the shell and seals one side of the shell, a tray is vertically connected to the fixed support, a convex column is formed on the tray, the outer rotor motor is connected with the fixed support, the outer rotor motor comprises a stator, a magnetic shoe, a rotor, an end cover and a power shaft, the rotor is sleeved on the outer side of the stator, the magnetic shoe is attached to the inner wall of the rotor, the upper end of the rotor is connected with the end cover, the stator is fixed on the convex column, and the power shaft longitudinally penetrates through the fixed support and is respectively connected with the middle part of the end cover and an executing mechanism. The utility model has the advantages of small volume, low working noise, high working stability, good heat dissipation effect and long service life.

Description

Electric tool driven by outer rotor motor

Technical Field

The utility model belongs to the technical field of machinery, and relates to an electric tool, in particular to an electric tool driven by an outer rotor motor.

Background

The existing hand-held angle polisher or wall polisher in the market at present is generally driven by a motor, the motor is usually a series excited motor, interference sparks are easy to generate, a commutator is easy to damage, and the service life of the product is short; the series excited motor has small starting moment and running moment, and is difficult to regulate speed; the gear structure of the series excited machine results in large capacity, large volume and low working stability of the product.

Disclosure of Invention

The present utility model has been made in view of the above problems occurring in the prior art, and an object of the present utility model is to provide an electric tool driven by an external rotor motor.

The aim of the utility model can be achieved by the following technical scheme: the utility model provides an external rotor motor driven electric tool, includes casing and fixed bolster, casing internally mounted has external rotor motor, the fixed bolster nestification is in the casing and sealed casing one side, be connected with the tray on the fixed bolster perpendicularly, be formed with the projection on the tray, external rotor motor is connected with the fixed bolster, external rotor motor includes stator, magnetic shoe, rotor, end cover and power shaft, the outside of stator is located to the rotor cover, the magnetic shoe attaches to the inner wall of rotor, the end cover is connected to the rotor upper end, have the impeller that the fan blade that is cast by a plurality of integration technology formed on the end cover, the stator is fixed on the projection, the power shaft vertically passes the fixed bolster and connects end cover middle part and actuating mechanism respectively.

In the electric tool driven by the outer rotor motor, the end cover is provided with the vent hole which axially penetrates through the end cover between the adjacent fan blades.

In the electric tool driven by the outer rotor motor, a circle of axially outward spacing columns are formed below the end cover, and the adjacent two spacing columns clamp the corresponding magnetic shoes.

In the electric tool driven by the outer rotor motor, the upper end of the power shaft is sleeved with the upper bearing, and the lower end of the power shaft is sleeved with the lower bearing.

In the electric tool driven by the outer rotor motor, the executing mechanism comprises a polishing fixed disc, a fixed seat, an eccentric block and balancing weights, and a plurality of balancing weights are fixedly connected to the eccentric block through screws.

In the electric tool driven by the outer rotor motor, the eccentric block is connected with the lower end of the power shaft, the fixed seat is fixedly connected with the eccentric block, and the polishing fixed disc is connected to the fixed seat.

Compared with the prior art, the utility model has the effects of low rotating speed, large torque and large moment of inertia through the arrangement of the outer rotor motor and the fixed bracket. When the working force is applied to the pressing down, the executing mechanism can be effectively driven to finish polishing or buffing or polishing operation. The outer rotor motor is fixed by the fixing bracket, and the magnetic shoe is clamped by the spacing column, so that the structure of the outer rotor motor is more compact and firm; the end cover is provided with the impeller and the vent holes, so that the heat dissipation effect is better; the upper bearing and the lower bearing are arranged on the power shaft, so that abrasion is reduced, stable operation of the power shaft is ensured, the working stability is high, and the service life is long.

Drawings

FIG. 1 is a perspective view of the present power tool;

FIG. 2 is an exploded view of the interior of the present power tool housing;

FIG. 3 is a schematic view of a mounting bracket of the present power tool;

fig. 4 is a schematic diagram of an end cap of the present power tool.

In the figure, 1, a shell; 2. a fixed bracket; 21. a convex column; 22. a tray; 3. a stator; 4. a motor magnetic shoe; 5. a rotor; 6. an end cap; 61. an impeller; 62. a vent hole; 63. spacing columns; 7. a power shaft; 8. an upper bearing; 9. a lower bearing; 10. polishing the fixed disc; 11. a fixing seat; 12. an eccentric block; 13. and (5) balancing weights.

Description of the embodiments

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1 to 4, the present embodiment includes a housing 1, an external rotor motor is installed inside the housing 1, a gear structure is removed, and the structure is compact, and the volume and the weight are small. The fixed support 2 is nested in the shell 1 and seals one side of the shell 1, a tray 22 is vertically connected to the fixed support 2, a convex column 21 is formed on the tray 22, and an outer rotor motor is connected with the fixed support 2.

The outer rotor motor comprises a stator 3, a magnetic shoe 4, a rotor 5, an end cover 6 and a power shaft 7, wherein the stator 3 is fixed on a convex column 21 on a fixed bracket 2, so that the whole outer rotor motor is limited and fixed. The magnetic shoe 4 is attached to the inner wall of the rotor 5, the number of the magnetic shoe 4 is determined according to the use power, generally ten to twenty pieces, the rotor 5 is sleeved outside the stator 3, the outer diameter of the rotor 5 is generally fifty to sixty millimeters, the end cover 6 is connected to the upper end of the rotor 5, the power shaft 7 longitudinally penetrates through the fixed support 2, the upper end of the power shaft 7 is fixed to the middle part of the end cover 6, and the lower end of the power shaft 7 penetrates through the extended fixed support 2 and is connected with an actuating mechanism for polishing or polishing.

Further, the upper end of the power shaft 7 is sleeved with an upper bearing 8 which is supported by a convex column 21 on the fixed base 2, the lower end of the power shaft 7 close to the fixed support 2 is sleeved with a lower bearing 9, and therefore the power shaft 7 is supported by the upper bearing 8 and the lower bearing 9, abrasion consumption is smaller, rotation is smoother, and service life is longer.

As shown in fig. 2, the actuator includes a polishing fixed disk 10, a fixed seat 11, an eccentric mass 12 and a balancing weight 13, and the outer diameter of the polishing fixed disk 10 is generally five to ten inches, which is determined according to the polishing requirement. The fixed seat 11 and the eccentric block 12 are fixedly connected, the polishing fixed disc 10 is connected to the fixed seat 11, the power shaft 7 rotates to drive the fixed seat 11 and the eccentric block 12 to rotate, so that the polishing fixed disc 10 is driven to eccentrically rotate, and a plurality of balancing weights 13 are fixed on the eccentric block 12 through screws.

Further, in this embodiment, the number of the balancing weights 13 is two, and the number of the balancing weights 13 is selected appropriately according to the actual requirement, so as to reduce the vibration caused by the centrifugal force, so that the power shaft 7, the polishing fixing disc 10, the fixing seat 11 and the eccentric block 12 rotate smoothly, and the work is stable.

As shown in fig. 4, the end cover 6 is formed with an impeller 61 formed by a plurality of blades cast by an integrated process, and the end cover 6 is provided with a vent hole 62 which is positioned between adjacent blades and penetrates through the end cover 6. Under the operating condition, the rotor 5 drives the end cover 6 to rotate, the impeller 61 and the vent holes 62 facilitate quick air circulation, the heat dissipation effect is good, the product use stability is improved, and the service life of the product is prolonged.

Further, the end cover 6 is provided with a circle of axially outward spacing columns 63, and the adjacent two spacing columns 63 clamp the corresponding magnetic shoe 4, so that the structure is more compact, and the product volume is reduced.

In practical use, the polishing fixing plate can be replaced by a polishing fixing plate or a polishing fixing plate according to the required polishing or buffing or polishing requirements. The proper actuating mechanism is selected to be fixed at the lower end of the power shaft 7, the outer rotor motor works, the rotor 5 drives the power shaft 7 to rotate, the rotating speed is low, the torque is large, the moment of inertia is large, and the actuating mechanism can still be effectively driven to finish polishing or buffing or polishing operation when the working force is applied to press down, so that the use stability is good.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Although various terms are used more herein, the use of other terms is not precluded. These terms are used merely for convenience in describing and explaining the nature of the utility model; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present utility model.

Claims (6)

1. The utility model provides an external rotor motor driven electric tool, includes casing (1) and fixed bolster (2), its characterized in that, casing (1) internally mounted has external rotor motor, fixed bolster (2) nest in casing (1) and sealed casing (1) one side, be connected with tray (22) perpendicularly on fixed bolster (2), be formed with projection (21) on tray (22), external rotor motor is connected with fixed bolster (2), external rotor motor includes stator (3), magnetic shoe (4), rotor (5), end cover (6), power shaft (7), the outside of stator (3) is located to rotor (5) cover, magnetic shoe (4) are attached to the inner wall of rotor (5), end cover (6) are connected to rotor (5) upper end, impeller (61) that have the fan blade that is cast by a plurality of integration technologies, stator (3) are fixed on projection (21), power shaft (7) vertically pass fixed bolster (2) and connect end cover (6) and actuating mechanism respectively.

2. An outer rotor motor driven electric tool as claimed in claim 1, characterized in that the end cap (6) is provided with ventilation holes (62) axially penetrating the end cap between adjacent blades.

3. An outer rotor motor driven power tool according to claim 1, wherein a circle of axially outward spacing posts (63) is formed under the end cover (6), and two adjacent spacing posts clamp the corresponding magnetic shoe (4).

4. An outer rotor motor driven electric tool according to claim 1, characterized in that the upper end of the power shaft (7) is sleeved with an upper bearing (8), and the lower end of the power shaft is sleeved with a lower bearing (9).

5. The electric tool driven by the external rotor motor according to claim 1, wherein the actuating mechanism comprises a polishing fixed disc (10), a fixed seat (11), an eccentric block (12) and balancing weights (13), and a plurality of balancing weights (13) are fixedly connected to the eccentric block (12) through screws.

6. The electric tool driven by the external rotor motor according to claim 5, wherein the eccentric block (12) is connected with the lower end of the power shaft (7), the fixed seat (11) is fixedly connected with the eccentric block (12), and the polishing fixed disc (10) is connected to the fixed seat (11).