Sealed bearing applied to small motor and fan

Abstract

The utility model discloses a sealed bearing applied to a small motor, which comprises a bearing body and a sealing part, a bearing hole is arranged in the bearing body, a shaft hole is arranged in the sealing part, and the shaft hole is opposite to the bearing hole after the sealing part is arranged in the bearing body; the bearing body comprises a bearing head and a bearing main body, and the bearing main body and the bearing head are connected into an integral structure; the diameter of the bearing head part is larger than that of the bearing main body so as to form a structure protruding towards the outer surface of the bearing main body, a sealing groove for mounting a sealing part is formed in the bearing head part, the maximum inner diameter part of the sealing groove is in close fit with the maximum outer diameter part of the sealing part, and the sealing part is embedded into the sealing groove and is in close fit with the bearing main body. Therefore, equivalently, the part, used for assembling the sealing part, on the bearing is enlarged, so that the tapping operation is easier to realize, and meanwhile, the sealing part is correspondingly enlarged, so that the sealing part is simpler to manufacture and assemble, the efficiency is improved, and the defective rate is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings and fans, in particular to a sealed bearing applicable to a small motor and a fan and a blower using the sealed bearing. Background Art

[0002] Fans (blowers) are found inside many electrical products, including computer cases, refrigerators, and appliances. A fan typically consists of a fan frame, blades, and a motor. The blades are connected to a shaft core, which holds bearings. The shaft core is assembled with the motor and fan frame through the bearings, allowing the blades to rotate. Due to the high-speed rotation of the fan shaft core, the lubricating oil on the shaft core can splash onto the stator or outside the bearing mounting seat, shortening the service life of the fan motor. Furthermore, lubricating oil sticking to the stator can cause the shaft core to lack lubrication. This noise, generated when the shaft core drives the fan blades, reduces the service life of the fan motor and motor. To this end, the applicant has filed a Chinese utility model patent application entitled “A sealed bearing for fans and motors” with patent number CN202110048868.9. The sealing cover and locating piece of the sealed bearing are sealed with the bearing body. The bearing body, the sealing cover and the locating piece form an axial hole, in which the fan shaft core, the motor shaft, the blower shaft or the motor shaft can be assembled. Since an oil layer is provided in the axial hole, the fan shaft core or the shaft rotates more smoothly. The axial hole sealing setting can effectively prevent the oil layer in the axial hole from splashing out of the bearing, thereby increasing the service life of the fan, motor, blower and motor and reducing noise. However, since the fans used in electrical equipment are usually small in size, their motors are generally small motors, and the bearings in the motors are even smaller, with a diameter of about a few millimeters. At this scale, it is necessary to open a hole in the end face of the bearing body and make a sealing cover and locating piece to match it. Not only do the manufacturing processes for sealing covers and positioning parts require extremely high standards, resulting in a very low yield rate, usually no higher than 50%, but the requirements for assembly operations are also very high, resulting in low assembly efficiency, high costs, and a high defective rate. Utility Model Content

[0003] In view of the defects of the prior art, the utility model provides a sealed bearing and fan for small motors, which has a simple structure, is easier to meet the process requirements for opening holes and making sealing components, has higher assembly efficiency and lower defective rate.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a sealed bearing used for small motors, comprising a bearing body and a sealing component, the bearing body having a bearing hole, the sealing component having an axial hole, and after the sealing component is installed in the bearing body, the axial hole and the bearing hole are opposite to each other for inserting the shaft core, characterized in that: the bearing body comprises a bearing head and a bearing body, the bearing body and the bearing head are connected as an integral structure; the diameter of the bearing head is larger than the diameter of the bearing body to form a structure protruding toward the outside of the bearing body, a sealing groove is provided in the bearing head, the maximum inner diameter of the sealing groove is tightly matched with the maximum outer diameter of the sealing component (that is, the two sizes are basically the same), and the sealing component is embedded and installed in the sealing groove and forms a tight fit with the bearing body.

[0005] Furthermore, the longitudinal cross-sections of the bearing body and the sealing component are both T-shaped structures, the sealing groove includes a first sealing groove located on the outside and a second sealing groove located on the inside (it can also be one, two or more sealing grooves), and the sealing component includes a first sealing part and a second sealing part, the second sealing part is embedded in the second sealing groove, and the first sealing part is embedded in the first sealing groove.

[0006] Furthermore, the inner diameter of the first sealing groove is equivalent to the outer diameter of the bearing body, the inner diameter of the second sealing groove is smaller than the outer diameter of the bearing body, the first sealing part and the second sealing part are tightly fitted in the first sealing groove and the second sealing groove respectively, and the first sealing part completely covers the second sealing groove.

[0007] Furthermore, a sealing ring is provided on the outer wall of the second sealing portion to form a seal with the shaft core, and the sealing ring is pressed against the second sealing portion and the groove wall of the second sealing groove along with the sealing component.

[0008] Furthermore, the bearing hole is arranged in the bearing body and docked with the second sealing groove, and an oil storage tank is axially arranged on the hole wall of the bearing hole; the cross section of the oil storage tank is a U-shaped structure opening toward the center hole of the bearing body.

[0009] Preferably, the oil storage tanks include 2-8, for example 8, each of which is arranged on the hole wall at uniform intervals and runs axially through the entire hole wall; every two adjacent oil storage tanks constitute a group, and the bottom ends of the oil storage tanks in the same group are connected by a connecting groove to form a U-shaped groove, and the connecting groove is at a distance from the bottom of the bearing body.

[0010] Preferably, the sealing component is made of rubber (such as silicone, or other sealing materials), and its end face is flush with the end face of the bearing head.

[0011] A fan includes a fan frame, fan blades, a PCB board, a motor and a bearing. The fan frame has a shaft tube in the center. The stator of the motor is installed in the fan frame through the shaft tube. The fan blades are installed on the shaft tube through a shaft core and a bearing. The bearing is the aforementioned sealed bearing. The bearing body of the sealed bearing is inserted into the shaft tube. The bearing head is covered on the top of the shaft tube. The shaft core passes through the sealing component and the bearing body in sequence to achieve assembly and fixation with the motor. The bottom end of the shaft tube is sealed and fixed by an oil seal cover.

[0012] Furthermore, the bottom surface of the bearing head of the bearing body presses the top edge of the silicon steel sheet of the motor stator, thereby assisting in fixing the silicon steel sheet.

[0013] Furthermore, a gasket and an oil ring are provided at the bottom of the shaft core between the sealing bearing and the fan blades. The oil ring and the gasket are pressed by the fan blades so that the gasket is pressed tightly against the end face of the sealing component. The gasket is made of a graphite sheet. Another oil ring is fixed on the shaft core near the end through a retaining ring, and the other oil ring is against the end face of the bearing body.

[0014] The utility model adopts a structure in which the main body of the bearing is of normal size, while the diameter of the head is larger than that of the main body. The main body is normally inserted into the shaft tube, and the head covers the end of the shaft tube. This is equivalent to enlarging the area on the bearing for assembling the sealing component. This not only makes it easier to drill holes in the area, but also simplifies the manufacturing and assembly process of the sealing component due to the corresponding increase in the size of the sealing component, which is conducive to improving the manufacturing and assembly efficiency and reducing the defective rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a cross-sectional schematic diagram of the bearing of the present utility model;

[0016] Figure 2 This is a schematic cross-sectional exploded view of the bearing of the present utility model;

[0017] Figure 3 This is a schematic diagram of the end face of the bearing body of the utility model;

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of the bearing body of the utility model;

[0019] Figure 5 It is a cross-sectional schematic diagram of the bearing body of the utility model;

[0020] Figure 6 It is a cross-sectional schematic diagram of the fan of the present invention.

[0021] In the figure, 1 is the fan frame, 11 is the shaft tube, 12 is the oil seal cover, 2 is the fan blade, 21 is the shaft core, 3 is the bearing body, 31 is the bearing head, 32 is the bearing body, 33 is the bearing hole, 34 is the first sealing groove, 35 is the second sealing groove, 36 is the hole wall, 37 is the oil storage tank, 38 is the connecting groove, 4 is the sealing component, 41 is the first sealing part, 42 is the second sealing part, 43 is the shaft hole, 44 is the sealing ring, 5 is the gasket, 6 is the oil ring, 7 is the retaining ring, 8 is the silicon steel sheet, and 9 is the PCB board. DETAILED DESCRIPTION

[0022] In this embodiment, refer to Figure 1-Figure 5 The sealed bearing used in small motors includes a bearing body 3 and a sealing component 4 (similar to a sealing ring, also known as a dust-proof oil return wheel). The bearing body 3 has a bearing hole 33, and the sealing component 4 has an axial hole 43. After the sealing component 4 is installed in the bearing body 3, the axial hole 43 and the bearing hole 33 are opposite to each other for inserting the shaft core 21; the bearing body 3 includes a bearing head 31 and a bearing body 32, and the bearing body 32 and the bearing head 31 are connected as an integral structure; the diameter of the bearing head 31 is larger than the diameter of the bearing body 32 to form a structure protruding toward the outside of the bearing body 32, similar to a cap; a sealing groove is provided in the bearing head 31, and the maximum inner diameter of the sealing groove is tightly matched with the maximum outer diameter of the sealing component 4, so that the size of the sealing component 4 can be significantly larger than that of a traditional sealing ring; the sealing component 4 is embedded in the sealing groove and forms a tight fit with the bearing body 3.

[0023] The longitudinal sections of the bearing body 3 and the sealing component 4 are both T-shaped structures. The sealing groove includes a first sealing groove 34 located on the outside and a second sealing groove 35 located on the inside. The sealing component 4 includes a first sealing portion 41 and a second sealing portion 42. The second sealing portion 42 is embedded in the second sealing groove 35, and the first sealing portion 41 is embedded in the first sealing groove 34.

[0024] The inner diameter of the first sealing groove 34 is equivalent to the outer diameter of the bearing body 32, and the inner diameter of the second sealing groove 35 is smaller than the outer diameter of the bearing body 32. The first sealing portion 41 and the second sealing portion 42 are tightly fitted in the first sealing groove 34 and the second sealing groove 35 respectively, and the first sealing portion 41 completely covers the second sealing groove 35, which can achieve a dust-proof effect.

[0025] A sealing ring 44 is provided on the outer wall of the second sealing portion 42 to form a seal with the shaft core. The sealing ring 44 is pressed against the second sealing portion 42 and the groove wall of the second sealing groove 35 along with the sealing component 4 to further improve the sealing effect.

[0026] The bearing hole 33 is provided in the bearing body 32 and is aligned with the second sealing groove 35. An oil reservoir 37 is provided axially on the wall 36 of the bearing hole 33. The oil reservoir 37 has a U-shaped cross-section that opens toward the center hole of the bearing body 32. When the fan is running, the grease melts due to heat. At this time, the grease is stored in the oil reservoir 37 to ensure lubrication of the shaft core 21.

[0027] The oil reservoirs 37 include 2 to 8, for example 8, slots 37 arranged evenly spaced apart on the bore wall 36 and extending axially throughout the entire bore wall 36. Two adjacent oil reservoirs 37 form a group, and the bottom ends of the oil reservoirs 37 in a group are connected by a connecting slot 38 to form a U-shaped groove (for example, four groups of U-shaped grooves in this embodiment). The connecting slots 38 are spaced a certain distance (for example, 8 mm) from the bottom of the bearing body 32. This allows the oil to flow downward along the oil reservoir slots 37, that is, continuously along the shaft core. When the oil reaches the bottom (i.e., the connecting slots 38), it can no longer flow downward, thereby effectively storing the oil within the bearing.

[0028] The sealing component 4 is made of rubber (such as silicone), and its end surface is flush with the end surface of the bearing head 31 .

[0029] Reference Figures 1-6 The fan (also known as a blower) includes a fan frame 1, fan blades 2, a PCB board 9, a motor, and bearings. The fan frame 1 has a shaft tube 11 at its center. The motor's stator is mounted in the fan frame 1 via the shaft tube 11. The fan blades 2 are mounted on the shaft tube 11 via a shaft core 21 in conjunction with the bearings. The bearing is the aforementioned sealed bearing, with the bearing body 32 inserted into the shaft tube 11. The bearing head 31 covers the top of the shaft tube 11. The shaft core 21 passes through the sealing component 4 (i.e., the dustproof oil return wheel) and the bearing body 3 in sequence to achieve assembly and fixation with the motor. The bottom end of the shaft tube 11 is sealed and fixed by an oil seal cap 12 to prevent grease leakage, or it can be directly injection-molded with the outer frame to form a one-piece seal. The sealing component 4 is pressed into the bearing body 3, and the inner diameter of the sealing component 4 contacts the shaft core 21, which can effectively achieve dust prevention and circulation and volatilization of grease in the bearing.

[0030] The bottom surface of the bearing head 31 of the bearing body 3 presses the top edge of the silicon steel sheet 8 of the motor stator, which can assist in fixing the silicon steel sheet 8.

[0031] A gasket 5 and an oil ring 6 are provided at the bottom of the shaft core 21 between the sealing bearing and the fan blade 2. The oil ring 6 and the gasket 5 are pressed by the fan blade 2 so that the gasket 5 is pressed tightly against the end face of the sealing component 4. The gasket 5 is made of a graphite sheet. Another oil ring 6 is fixed near the end of the shaft core 21 by a retaining ring 7, and the other oil ring 6 is against the end face of the bearing body 32.

[0032] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A sealed bearing for a small motor, comprising a bearing body and a sealing member, wherein the bearing body has a bearing hole and the sealing member has an axial hole. After the sealing member is installed in the bearing body, the axial hole and the bearing hole are opposite to each other for inserting a shaft core. The invention is characterized in that: The bearing body includes a bearing head and a bearing body, and the bearing body and the bearing head are connected as an integral structure; the diameter of the bearing head is larger than the diameter of the bearing body to form a structure protruding toward the outside of the bearing body, and a sealing groove is provided in the bearing head, and the maximum inner diameter of the sealing groove is tightly matched with the maximum outer diameter of the sealing component, and the sealing component is embedded and installed in the sealing groove and forms a tight fit with the bearing body.

2. The sealed bearing for a small motor according to claim 1, characterized in that: The longitudinal sections of the bearing body and the sealing component are both T-shaped structures. The sealing groove includes a first sealing groove located on the outside and a second sealing groove located on the inside. The sealing component includes a first sealing part and a second sealing part. The second sealing part is embedded in the second sealing groove, and the first sealing part is embedded in the first sealing groove.

3. The sealed bearing for a small motor according to claim 2, characterized in that: The inner diameter of the first sealing groove is equivalent to the outer diameter of the bearing body, and the inner diameter of the second sealing groove is smaller than the outer diameter of the bearing body. The first sealing part and the second sealing part are tightly fitted in the first sealing groove and the second sealing groove respectively, and the first sealing part completely covers the second sealing groove.

4. The sealed bearing for a small motor according to claim 2, characterized in that: A sealing ring is provided on the outer wall of the second sealing portion, and the sealing ring is pressed tightly against the second sealing portion and the groove wall of the second sealing groove.

5. The sealed bearing for a small motor according to claim 1, characterized in that: The bearing hole is arranged in the bearing body and docked with the second sealing groove. An oil storage groove is axially arranged on the hole wall of the bearing hole; the cross section of the oil storage groove is a U-shaped structure opening toward the central hole of the bearing body.

6. The sealed bearing for a small motor according to claim 5, characterized in that: The oil storage tanks include 2-8 oil storage tanks, each of which is arranged on the hole wall at uniform intervals and penetrates the entire hole wall axially; every two adjacent oil storage tanks constitute a group, and the bottom ends of the oil storage tanks in the same group are connected by a connecting groove to form a U-shaped groove, and the connecting groove is at a distance from the bottom of the bearing body.

7. The sealed bearing for a small motor according to claim 1, characterized in that: The sealing component is made of rubber, and its end surface is flush with the end surface of the bearing head.

8. A fan comprising a fan frame, fan blades, a PCB board, a motor and bearings, wherein the fan frame has a shaft tube at its center, the stator of the motor is mounted in the fan frame via the shaft tube, and the fan blades are mounted on the shaft tube via a shaft core and bearings, characterized in that: The bearing is a sealed bearing as described in any one of claims 1 to 7. The bearing body of the sealed bearing is inserted into the shaft tube, the bearing head is covered on the top of the shaft tube, the shaft core passes through the sealing component and the bearing body in sequence to be assembled and fixed with the motor, and the bottom end of the shaft tube is sealed and fixed by an oil seal cover.

9. The fan according to claim 8, wherein: The bottom surface of the bearing head of the bearing body presses against the top edge of the silicon steel sheet of the motor stator.

10. The fan according to claim 8, wherein: A gasket and an oil ring are provided at the bottom of the shaft core, between the sealing bearing and the fan blades. The oil ring and the gasket are pressed by the fan blades so that the gasket is pressed tightly against the end face of the sealing component. The gasket is made of graphite sheet. Another oil ring is fixed on the shaft core near the end through a retaining ring, and the other oil ring is against the end face of the bearing body.

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