Sealed bearing applied to small motor and fan

Abstract

The invention 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 present invention relates to the technical field of bearings and fans, and 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 used in many electrical products such as computer cases, refrigerators, and electrical equipment. Fans generally include fan frames, fan blades, motors, etc. The fan blades are connected to a shaft core, and a bearing is fixed on the shaft core. The fan blades are assembled with the motor and fan frame through the bearing, so that the fan blades can be driven by the motor to rotate. Due to the high-speed rotation of the fan shaft core, the lubricating oil on the shaft core will splash onto the stator or the outside of the bearing mounting seat, affecting the service life of the fan motor and motor. The lubricating oil sticking to the stator will cause the shaft core to lack lubrication. When the shaft core drives the fan blades to rotate, abnormal sounds will be emitted, resulting in noise and reducing the service life of the fan motor and motor. To this end, the applicant has filed a Chinese invention patent application entitled "A sealed bearing for fans and motors" with patent number CN202110048868.9. The sealing cover and positioning piece of the sealed bearing are sealed with the bearing body. The bearing body, the sealing cover and the positioning piece form an axial hole. The fan shaft core, the motor shaft, the fan shaft or the motor shaft can be assembled in the axial hole. Since there is an oil layer 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, so as to increase the service life of the fan, motor, fan and motor, and reduce 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. Under this scale, a hole must be opened on the end face of the bearing body, and a matching sealing cover and positioning piece must be made. Not only do the manufacturing processes for sealing covers and positioning parts require extremely high standards and have 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. Summary of the invention

[0003] In view of the defects of the prior art, the present invention provides a sealed bearing and a fan for small motors which have a simple structure, are easier to achieve the process requirements for opening holes and making sealing components, have 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, including a bearing body and a sealing component, the bearing body has a bearing hole, the sealing component has an axial hole, 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 includes 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 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), the sealing component includes a first sealing portion and a second sealing portion, the second sealing portion is embedded in the second sealing groove, and the first sealing portion 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 respectively tightly fitted in the first sealing groove and the second sealing groove, and the first sealing part completely covers the second sealing groove.

[0007] Furthermore, a sealing ring is arranged 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 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 center hole of the bearing body.

[0009] Preferably, the oil storage grooves include 2-8, for example 8, each of which is arranged on the hole wall at uniform intervals and penetrates the entire hole wall axially; every two adjacent oil storage grooves constitute a group, and the bottom ends of the same group of oil storage grooves 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 comprises a fan frame, fan blades, a PCB board, a motor and a bearing. The fan frame has a shaft tube at the center, the motor stator is installed in the fan frame through the shaft tube, and 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 be assembled and fixed with the motor, and 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 presses against the end face of the bearing body.

[0014] The present invention makes the bearing body into a structure with a normal size and a head with a larger diameter than the body, the body is normally inserted into the shaft tube, and the head covers the end of the shaft tube. This is equivalent to enlarging the part of the bearing for assembling the sealing component, so that not only is it easier to perform the hole opening operation thereon, but also the size of the sealing component is correspondingly increased, thereby making the manufacturing and assembly process of the sealing component simpler, which is conducive to improving the efficiency of manufacturing and assembly and reducing the defective rate. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 It is a cross-sectional exploded schematic diagram of the bearing of the present invention;

[0017] Figure 3 It is a schematic diagram of the end face of the bearing body of the present invention;

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the bearing body of the present invention;

[0019] Figure 5 is a cross-sectional schematic diagram of a bearing body of the present invention;

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

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

[0022] In this embodiment, refer to Figure 1-Figure 5 The sealed bearing used for small motors includes a bearing body 3 and a sealing component 4 (similar to a sealing ring, also known as a dustproof oil return wheel), the bearing body 3 has a bearing hole 33, the sealing component 4 has an axial hole 43, and 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 outward from 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 and installed 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 respectively tightly fitted in the first sealing groove 34 and the second sealing groove 35, and the first sealing portion 41 completely covers the second sealing groove 35, which can achieve 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 arranged in the bearing body 32 and docked with the second sealing groove 35. An oil storage groove 37 is arranged axially on the hole wall 36 of the bearing hole 33. The cross section of the oil storage groove 37 is a U-shaped structure opening toward the central hole of the bearing body 32. When the fan is running, the grease will melt due to heat. At this time, the grease can be stored in the oil storage groove 37 to ensure lubrication of the shaft core 21.

[0027] The oil storage grooves 37 include 2-8, for example, 8, and each oil storage groove 37 is arranged on the hole wall 36 at uniform intervals and penetrates the entire hole wall 36 in the axial direction. Every two adjacent oil storage grooves 37 form a group, and the bottom ends of the same group of oil storage grooves 37 are connected by a connecting groove 38 to form a U-shaped groove (for example, 4 groups of U-shaped grooves in this embodiment), and the connecting groove 38 is at a distance from the bottom of the bearing body 32 (for example, 8 mm). In this way, the oil will flow down along the oil storage groove 37, that is, it will always flow down along the shaft core. When it flows to the bottom (that is, the connecting groove 38), the oil can no longer go down, thereby achieving the effect of storing the oil in 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 Figure 1-Figure 6 The fan (also called a blower) includes a fan frame 1, a fan blade 2, a PCB board 9, a motor and a bearing. The fan frame 1 has a shaft tube 11 in the center. The stator of the motor is installed in the fan frame 1 through the shaft tube 11. The fan blade 2 is installed on the shaft tube 11 through the shaft core 21 in conjunction with the bearing. The bearing is the aforementioned sealed bearing. The bearing body 32 of the sealed bearing is 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 turn to achieve assembly and fixation with the motor. The bottom end of the shaft tube 11 is sealed and fixed by an oil seal cover 12 to prevent grease leakage, or is directly injection molded with the outer frame as an integral 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 play an auxiliary fixing role for 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 against the end face of the sealing component 4. The gasket 5 is made of a graphite sheet. Another oil ring 6 is fixed to the shaft core 21 near the end through 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. That is, 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 component, wherein the bearing body has a bearing hole, and the sealing component has an axial hole. 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 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 small motors 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 small motors 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, 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 respectively tightly fitted in the first sealing groove and the second sealing groove, and the first sealing part completely covers the second sealing groove.

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

7. The sealed bearing for small motors 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 a bearing, wherein the fan frame has a shaft tube at the center, the stator of the motor is installed in the fan frame through the shaft tube, and the fan blades are installed on the shaft tube through a shaft core and a bearing, 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 covers 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, characterized in that: The bottom surface of the bearing head of the bearing body presses the top edge of the silicon steel sheet of the motor stator.

10. The fan according to claim 8, characterized in that: A gasket and an oil ring are arranged at the bottom of the shaft core between the sealing bearing and the fan blade. The oil ring and the gasket are pressed by the fan blade 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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