Brushless motor bearing steam-proof structure

Abstract

The utility model relates to the technical field of brushless motors, in particular to a steam-proof structure of a brushless motor bearing, which is characterized in that a bearing hole is formed in the front end surface of a motor outer shell; a rotating shaft supporting bearing is fixed in the bearing hole; the rotating shaft is rotationally connected to an inner ring of the rotating shaft supporting bearing; one end, extending out of the motor shell, of the rotating shaft is sequentially sleeved with an oil-retaining bearing and a rubber sleeve from inside to outside; one end face of the rubber sleeve is fixed on the end face of the motor shell; the inner ring surface of the rubber sleeve is attached to the outer circle surface of the oil bearing. And the inner ring of the oil bearing is matched and connected to the shaft body of the rotating shaft. When in use, the rotary shaft supporting bearing is isolated from the outer side of the rotary shaft under the matching of the oil-retaining bearing and the rubber sleeve, so that steam is prevented from being in contact with the rotary shaft supporting bearing, and the service life of the rotary shaft supporting bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to a steam-proof structure for a bearing of a brushless motor. Background Art

[0002] A steam oven is an oven that can steam food. When baking, the combination of steam can give food different textures, which is favored by consumers. In order to timely exhaust the steam in the oven, an exhaust fan structure needs to be set on the steam oven.

[0003] However, in the existing exhaust fan motors for baking trays, bearings are provided on the end face where the motor shaft extends out of the motor housing to enable the shaft to form a rotational connection with the motor housing. However, in the working environment of a steam oven, the steam inside the box body is likely to directly penetrate onto the bearings, affecting the service life of the bearings. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a steam-proof structure for a bearing of a brushless motor aiming at the defects and deficiencies of the prior art.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] A steam-proof structure for a bearing of a brushless motor according to the utility model includes a motor housing and a rotating shaft rotatably connected to the motor housing; a bearing hole is provided on the front end face of the motor housing; a rotating shaft support bearing is fixed inside the bearing hole; the rotating shaft is rotatably connected to the inner ring of the rotating shaft support bearing; one end of the rotating shaft extending out of the motor housing is sleeved with an oil-impregnated bearing and a rubber sleeve from inside to outside in sequence; one end face of the rubber sleeve is fixed on the end face of the motor housing; the inner ring surface of the rubber sleeve is attached to the outer circular surface of the oil-impregnated bearing; the inner ring of the oil-impregnated bearing is fitted and connected to the shaft body of the rotating shaft.

[0007] Further, a bearing positioning groove matching the oil-impregnated bearing is provided inside the rubber sleeve; the cross-sectional diameter of the bearing positioning groove first increases and then decreases along the length direction of the rotating shaft; the oil-impregnated bearing is embedded into the bearing positioning groove.

[0008] Further, a bearing avoidance groove is provided on one end face of the rubber sleeve close to the motor housing; the diameter of the bearing avoidance groove is larger than the outer diameter of the outer ring of the rotating shaft support bearing.

[0009] Further, an external thread and a clamping groove are provided on the rotating shaft; a support ring is sleeved on the shaft body of the rotating shaft; a circlip for supporting the support ring is fixed by clamping in the clamping groove.

[0010] Further, the motor housing is composed of a bottom cover and a top cover plate fixed on the top surface of the bottom cover; an inner shaft sleeve is arranged in the middle of the top cover plate; the outer ring of the rotating shaft support bearing is fixed in the inner hole of the inner shaft sleeve; the rubber sleeve is fixed on the top cover plate; multiple connecting plates are fixed on the outer side wall of the top cover plate; the connecting plates are circumferentially distributed on the top cover plate.

[0011] Further, multiple heat dissipation fins are arranged on the outer surface of the bottom cover; the heat dissipation fins are circumferentially distributed on the bottom cover.

[0012] After adopting the above structure, the beneficial effects of the present utility model are as follows: By sleeving a rubber sleeve that can cover the outer ring of the rotating shaft support bearing on the outside of the rotating shaft, steam can be blocked from entering the rotating shaft support bearing from the edge of the bearing hole on the motor housing; after the rubber sleeve is wrapped and fixed on the outer ring of the oil-impregnated bearing, the gap between the rubber sleeve and the oil-impregnated bearing is sealed; the oil-impregnated bearing seals the gap between the inner ring of the oil-impregnated bearing and the rotating shaft by its own characteristics; in this structure, through the cooperation of the oil-impregnated bearing and the rubber sleeve, the rotating shaft support bearing is isolated from the outside of the rotating shaft, preventing steam from contacting the rotating shaft support bearing and improving the service life of the rotating shaft support bearing. Description of the Drawings

[0013] Figure 1 is the structural schematic diagram of the present utility model;

[0014] Figure 2 is the exploded view of the present utility model;

[0015] Figure 3 is the upper half part sectional view of the motor;

[0016] Figure 4 is the sectional view of the rubber sleeve;

[0017] Figure 5 is the structural diagram of the oil-impregnated bearing;

[0018] Figure 6 is the structural diagram of the top cover plate;

[0019] Description of the Reference Numerals:

[0020] 1. Rotating shaft; 101. Card slot; 102. External thread; 2. Supporting ring; 3. Rubber sleeve;

[0021] 301. Bearing positioning groove; 302. Bearing avoidance groove; 4. Top cover plate; 401. Connecting plate;

[0022] 402. Inner shaft sleeve; 5. Bottom cover; 6. Heat dissipation fin; 7. Oil-impregnated bearing; 8. Snap ring;

[0023] 9. Rotating shaft support bearing. Detailed Embodiment

[0024] The present utility model will be further described below in conjunction with the accompanying drawings.

[0025] As Figures 1 to 6 shown, a steam-proof structure for a brushless motor bearing according to the present utility model includes a motor housing and a rotating shaft 1 rotatably connected to the motor housing; a bearing hole is provided on the front end face of the motor housing; a rotating shaft support bearing 9 is fixed inside the bearing hole; the rotating shaft 1 is rotatably connected to the inner ring of the rotating shaft support bearing 9; one end of the rotating shaft 1 extending out of the motor housing is sleeved with an oil-impregnated bearing 7 and a rubber sleeve 3 from inside to outside in sequence; one end face of the rubber sleeve 3 is fixed on the end face of the motor housing; the inner ring surface of the rubber sleeve 3 is attached to the outer circumferential surface of the oil-impregnated bearing 7; the inner ring of the oil-impregnated bearing 7 is fitted and connected to the shaft body of the rotating shaft 1;

[0026] The oil-impregnated bearing 7 has no essential difference from the prior art, so it will not be elaborated here; after being powered on, the rotating shaft 1 can rotate; the oil-impregnated bearing 7 and the rotating shaft 1 are selected and matched according to the use conditions to ensure the free rotation of the rotating shaft 1 and sufficient sealing between the oil-impregnated bearing 7 and the rotating shaft 1;

[0027] By sleeving a rubber sleeve 3 capable of covering the outer ring of the rotating shaft support bearing 9 on the outside of the rotating shaft 1, steam can be blocked from entering the rotating shaft support bearing 9 from the edge of the bearing hole on the motor housing; after the rubber sleeve 3 is wrapped and fixed on the outer ring of the oil-impregnated bearing 7, the gap between the rubber sleeve 3 and the oil-impregnated bearing 7 is sealed; the oil-impregnated bearing 7 seals the gap between its inner ring and the rotating shaft 1 by its own characteristics; in this structure, through the cooperation of the oil-impregnated bearing 7 and the rubber sleeve 3, the rotating shaft support bearing 9 is isolated from the outside of the rotating shaft 1 to prevent steam from contacting the rotating shaft support bearing 9 and improve the service life of the rotating shaft support bearing 9.

[0028] As a preferred embodiment of the present utility model, a bearing positioning groove 301 matching the oil-impregnated bearing 7 is provided inside the rubber sleeve 3; the cross-sectional diameter of the bearing positioning groove 301 first increases and then decreases along the length direction of the rotating shaft 1; the oil-impregnated bearing 7 is embedded in the bearing positioning groove 301; the bearing positioning groove 301 is a structure with a large middle and small ends, and the outer diameter of the oil-impregnated bearing 7 also first increases and then decreases along the length direction of the rotating shaft 1; therefore, when assembling the oil-impregnated bearing 7, only the elastic deformation of the rubber sleeve 3 itself is needed to embed the oil-impregnated bearing 7 into the bearing positioning groove 301 of the rubber sleeve 3; the oil-impregnated bearing 7 is fixed on the rubber sleeve 3 by limiting at the upper and lower ends of the bearing positioning groove 301; the assembly efficiency of the oil-impregnated bearing 7 and the rubber sleeve 3 is improved.

[0029] As a preferred embodiment of the present utility model, a bearing avoidance groove 302 is provided on one end face of the rubber sleeve 3 close to the motor housing; the diameter of the bearing avoidance groove 302 is larger than the outer diameter of the shaft support bearing 9; the shaft support bearing 9 is avoided through the bearing avoidance groove 302 to prevent interference between the end face of the rubber sleeve 3 and the shaft support bearing 9.

[0030] As a preferred embodiment of the present utility model, an external thread 102 and a clamping groove 101 are provided on the rotating shaft 1; a support ring 2 is sleeved on the shaft body of the rotating shaft 1; a snap ring 8 for supporting the support ring 2 is fixedly clamped in the clamping groove 101; the external thread 102 is used for connecting with the internal thread of the fan blade, and the fan blade is installed to a set depth on the rotating shaft 1 by limiting the support ring 2; the snap ring 8 is detachably connected to the rotating shaft 1 by being snapped into the clamping groove 101, and the limit of the snap ring 8 restricts the depth of the support ring 2 sleeved on the rotating shaft 1.

[0031] As a preferred embodiment of the present utility model, the motor housing is composed of a bottom cover 5 and a top cover plate 4 fixed on the top end face of the bottom cover 5; an inner shaft sleeve 402 is provided in the middle of the top cover plate 4; the outer ring of the shaft support bearing 9 is fixed in the inner hole of the inner shaft sleeve 402; the rubber sleeve 3 is fixed on the top cover plate 4; a plurality of connecting plates 401 are fixed on the outer side wall of the top cover plate 4; the connecting plates 401 are circumferentially distributed on the top cover plate 4;

[0032] The connecting plates 401 are used for connecting with the housing of the steam oven, so that the whole motor is fixed on the steam oven; the inner shaft sleeve 402 is used for connecting the shaft support bearing 9 to ensure that the bottom cover 5 and the rotating shaft 1 are coaxially arranged.

[0033] As a preferred embodiment of the present utility model, a plurality of heat dissipation fins 6 are provided on the outer surface of the bottom cover 5; the heat dissipation fins 6 are circumferentially distributed on the bottom cover 5; the heat dissipation fins 6 are used to enhance the heat dissipation effect of the whole motor.

[0034] The above is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present utility model are included in the scope of the patent application of the present utility model.

Claims

1. A brushless motor bearing steam-proof structure, comprising a motor housing and a rotating shaft (1) rotatably connected to the motor housing; a bearing hole is provided on the front end surface of the motor housing; a rotating shaft support bearing (9) is fixed inside the bearing hole; the rotating shaft (1) is rotatably connected to the inner ring of the rotating shaft support bearing (9); Features: One end of the rotating shaft (1) extending out of the motor housing is covered with an oil-containing bearing (7) and a rubber sleeve (3) in sequence from the inside to the outside; one end face of the rubber sleeve (3) is fixed to the end face of the motor housing; the inner ring surface of the rubber sleeve (3) is fitted on the outer cylindrical surface of the oil-containing bearing (7); and the inner ring of the oil-containing bearing (7) is fitted and connected to the shaft body of the rotating shaft (1).

2. The anti-steam structure of a brushless motor bearing according to claim 1, characterized in that: A bearing positioning groove (301) matching the oil-containing bearing (7) is arranged inside the rubber sleeve (3); the cross-sectional diameter of the bearing positioning groove (301) first increases and then decreases along the length direction of the rotating shaft (1); and the oil-containing bearing (7) is embedded in the bearing positioning groove (301).

3. The anti-steam structure of a brushless motor bearing according to claim 1, characterized in that: A bearing avoidance groove (302) is provided on one end surface of the rubber sleeve (3) close to the motor outer shell; the diameter of the bearing avoidance groove (302) is larger than the outer ring diameter of the rotating shaft support bearing (9).

4. The anti-steam structure of a brushless motor bearing according to claim 1, characterized in that: The rotating shaft (1) is provided with an external thread (102) and a clamping groove (101); a supporting ring (2) is sleeved on the shaft body of the rotating shaft (1); and a retaining spring (8) for supporting the supporting ring (2) is fixedly buckled in the clamping groove (101).

5. The anti-steam structure of a brushless motor bearing according to claim 1, characterized in that: The motor outer shell is composed of a bottom cover (5) and a top cover plate (4) fixed to the top surface of the bottom cover (5); an inner shaft sleeve (402) is arranged in the middle of the top cover plate (4); the outer ring of the rotating shaft support bearing (9) is fixed to the inner hole of the inner shaft sleeve (402); the rubber sleeve (3) is fixed to the top cover plate (4); a plurality of connecting plates (401) are fixed to the outer side wall of the top cover plate (4); and the connecting plates (401) are distributed in a circumferential manner on the top cover plate (4).

6. The anti-steam structure of a brushless motor bearing according to claim 5, characterized in that: The outer surface of the bottom cover (5) is provided with a plurality of heat dissipation fins (6); the heat dissipation fins (6) are distributed in a circular pattern on the bottom cover (5).

Images