Motor structure of carving and grinding pen

Abstract

The utility model discloses a carving and grinding pen motor structure, which comprises a motor shell, a tail cover, a bearing, a pneumatic rotor and a nut, the tail cover is arranged at the rear end part of the motor shell, the pneumatic rotor is arranged on the tail cover through the bearing, and a rotating shaft of the pneumatic rotor is in clearance fit with an inner ring of the bearing. The end part of the rotating shaft is provided with an extension part capable of extending out of the inner ring of the bearing, the extension part is provided with an external thread matched with the nut, and the nut is screwed on the extension part to realize the purpose of limitation. The bearing is reasonable in structural design, the rotating shaft is in clearance fit with the inner ring of the bearing, the nut is combined for limiting, assembly is simple and convenient, the problem that the load of the balls and the retainer is large due to extrusion caused by a traditional close-fitting structure is solved on the basis of protecting stable operation, heat productivity is reduced, the bearing rotates more smoothly, and the service life of the bearing is prolonged. And the motor can exert larger power and power, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding tools, in particular to a grinding pen motor structure used on a manipulator. Background Art

[0002] Grinding pens have the advantages of safety, low cost, light weight and fast operation speed. They have been widely used in the grinding, polishing and trimming of various molds, glass products, stone materials, handicrafts, etc.

[0003] For example, the utility model with publication number "CN203077054U" and titled "Pneumatic Engraving Grinder" discloses a pneumatic engraving grinder comprising a body, with a clamp and a high-pressure air inlet port provided at each end of the body, a trigger and a speed control switch provided on the side of the body, the trigger and the speed control switch being arranged opposite each other, and a knob for manually turning the speed control provided on the outside of the speed control switch. The motor shaft in the motor assembly is assembled with an end cap via a bearing, and the fit is tight. During installation, the overly tight fit makes assembly difficult, which can easily damage the bearing. Furthermore, after assembly, the outer ring of the bearing is squeezed by the end cap, while the inner ring of the bearing is squeezed by the motor shaft. This results in a heavy load on the ball bearings and retaining cage between the outer and inner rings, generating a large amount of heat. This can easily lead to damage after prolonged pneumatic operation. Utility Model Content

[0004] In view of the above-mentioned deficiencies, the purpose of the present invention is to provide a grinding pen motor structure with reasonable structural design, easy assembly and long service life.

[0005] In order to achieve the above purpose, the technical solution provided by the present utility model is:

[0006] A motor structure for a grinding pen includes a motor housing, a tail cap, a bearing, a pneumatic rotor, and a nut. The tail cap is disposed at the rear end of the motor housing, and the pneumatic rotor is mounted on the tail cap via a bearing. The pneumatic rotor's rotating shaft and the inner ring of the bearing form a clearance fit. Preferably, the outer diameter of the pneumatic rotor's rotating shaft is 0.2-0.5 mm smaller than the inner diameter of the inner ring of the bearing. The end of the rotating shaft is provided with an extension that can extend from the inner ring of the bearing. The extension is provided with an external thread that mates with the nut, and the nut is screwed onto the extension to achieve the purpose of restraint.

[0007] As a preferred solution of the present invention, the tail cover is provided with a mounting cavity for mounting the bearing, the bottom surface of the mounting cavity is provided with a through hole for allowing the extension portion to pass through, the bearing is arranged in the mounting cavity, and the inner ring of the bearing is aligned with the through hole, which facilitates installation.

[0008] As a preferred solution of the present invention, the nut is located in the installation cavity, the length of the extension portion is shorter than the depth of the installation cavity, and the structural design is reasonable to avoid exposure of the nut and the extension portion.

[0009] As a preferred solution of the present invention, the front end portion of the motor housing is provided with two overlapping bearings to improve the load capacity and further extend the service life.

[0010] The beneficial effects of the present invention are as follows: the structural design of the present invention is reasonable, the rotating shaft and the inner ring of the bearing are clearance-fitted and limited by a nut, the assembly is simple and convenient, and on the basis of protecting stable operation, it also solves the problem of large loads on the ball and the cage caused by extrusion caused by the traditional tight-fitting structure, reduces heat generation, and also allows the bearing to rotate more smoothly, which is more conducive to the motor to exert greater power and power, and has a long service life.

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 It is a schematic cross-sectional structural diagram of the present utility model.

[0014] Figure 3 It is a three-dimensional structural diagram of the utility model.

[0015] Figure 4 It is a schematic diagram of the exploded structure of the present utility model. DETAILED DESCRIPTION

[0016] For example, see Figures 1 to 4 The present embodiment provides a grinding pen motor structure, which includes a pen shell 1, a pen inlet joint 2, an air guide component 3, a motor housing 4, a tail cover 5, a bearing 6, a pneumatic rotor 7 and a nut 8.

[0017] The pen inlet connector 2 is arranged at the upper end of the pen housing 1, and the air guide component 3 and the motor housing 4 are arranged in the pen housing 1 in sequence. One end of the air guide component 3 is connected to the pen inlet connector 2, and the other end is connected to the air inlet channel of the motor housing 4.

[0018] The tail cover 5 is disposed at the rear end of the motor housing 4. Specifically, the tail cover 5 is provided with a mounting cavity 51 for mounting the bearing 6. The bottom surface of the mounting cavity 51 is provided with a through-hole through which the extension portion passes. The bearing 6 is disposed within the mounting cavity 51, and the inner ring of the bearing 6 is aligned with the through-hole. The pneumatic rotor 7 is disposed on the tail cover 5 via the bearing 6. The end of the rotating shaft is provided with an extension portion 71 that can extend from the inner ring of the bearing 6. The extension portion 71 is machined with an external thread that is compatible with the nut 8. The nut 8 is screwed onto the extension portion 71. The length of the extension portion 71 is shorter than the depth of the mounting cavity 51. After assembly, the nut 8 is located within the mounting cavity 51, and the end of the extension portion 71 is also sunk into the mounting cavity 51, preventing the nut 8 and the extension portion 71 from being exposed.

[0019] The shaft of the pneumatic rotor 7 and the inner ring of the bearing 6 have a clearance fit. Preferably, the outer diameter of the shaft of the pneumatic rotor 7 is 0.2-0.5mm smaller than the inner diameter of the inner ring of the bearing 6, preferably 0.03mm. This assembly clearance facilitates rapid insertion of the shaft of the pneumatic rotor 7 through the inner ring of the bearing 6, avoiding damage to the bearing 6 caused by forceful installation. After assembly, the shaft and the inner ring of the bearing 6 are loosely fitted, so the inner ring of the bearing 6 is not subjected to radial compression from the shaft, thereby reducing the load on the balls and cage, resulting in relatively smooth rotation and low heat generation. Furthermore, the small clearance, coupled with the restraint of the nut 8, prevents excessive shaking of the shaft during rotation, ensuring normal operation.

[0020] Preferably, two overlapping front bearings 9 are provided at the front end of the motor housing 4 to further enhance the load capacity and extend the service life of the motor.

[0021] During assembly, since the rotating shaft and the inner ring of the bearing 6 adopt a clearance fit, the rotating shaft of the pneumatic rotor 7 can be easily assembled on the inner ring of the bearing 6 and restricted in combination with the nut 8. On the basis of ensuring stable operation, it also solves the problem of large load on the ball and cage caused by extrusion caused by the traditional tight-fitting structure, reduces heat generation, extends service life, and makes the bearing 6 rotate more smoothly, which is more conducive to the motor to exert greater power and power.

[0022] According to the disclosure and teachings of the above description, those skilled in the art to which the present invention belongs can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention. As described in the above embodiments of the present invention, other grinding pen structures obtained by using the same or similar structures are all within the scope of protection of the present invention.

Claims

1. A motor structure for a grinding pen, comprising a motor housing, a tail cover, a bearing, and a pneumatic rotor, wherein the tail cover is disposed at the rear end of the motor housing, and the pneumatic rotor is disposed on the tail cover via a bearing, characterized in that: It also includes a nut, the rotating shaft of the pneumatic rotor and the inner ring of the bearing are clearance-fitted, and the end of the rotating shaft is provided with an extension portion that can extend from the inner ring of the bearing, the extension portion is provided with an external thread that is compatible with the nut, and the nut is screwed on the extension portion.

2. The motor structure for a grinding pen according to claim 1, characterized in that: The outer diameter of the rotating shaft of the pneumatic rotor is 0.2-0.5 mm smaller than the inner diameter of the inner ring of the bearing.

3. The motor structure for a grinding pen according to claim 1, characterized in that: The tail cover is provided with a mounting cavity for mounting the bearing, the bottom surface of the mounting cavity is provided with a through hole for allowing the extension portion to pass through, the bearing is arranged in the mounting cavity, and the inner ring of the bearing is aligned with the through hole.

4. The motor structure for a grinding pen according to claim 3, characterized in that: The nut is located in the installation cavity.

5. The motor structure for a grinding pen according to claim 3, characterized in that: The length of the extension portion is shorter than the depth of the installation cavity.

6. The motor structure for a grinding pen according to any one of claims 1 to 5, characterized in that: The front end portion of the motor housing is provided with two overlapping bearings.

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