Ceramic bearing with heat dissipation structure

Abstract

The utility model relates to the technical field of ceramic bearings, in particular to a ceramic bearing with a heat dissipation structure. The ceramic bearing with the heat dissipation structure comprises a ceramic outer ring, a ceramic inner ring and a plurality of ceramic balls arranged between the ceramic outer ring and the ceramic inner ring, wherein a retainer is arranged between the ceramic outer ring and the ceramic inner ring; the ceramic balls are arranged on the retainer and are rotationally connected between the ceramic outer ring and the ceramic inner ring; heat dissipation holes are formed in the retainer; the holder is connected with fan blades, and the fan blades are located in the heat dissipation holes of the holder. Under the action of the fan blades, air pressure difference is formed on the front and back surfaces of the ceramic bearing, air flow is accelerated to penetrate through the ceramic bearing, a good heat dissipation effect is achieved on the ceramic bearing, and damage to the ceramic bearing caused by heat accumulation due to friction is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ceramic bearings, in particular to a ceramic bearing with a heat dissipation structure. BACKGROUND

[0002] Zirconia ceramic has the advantages of high hardness (hardness up to 86HRC), high strength (common temperature bending strength can reach 2100MPa and still maintains 1190MPa at 1000 DEG C), good wear resistance, self-lubricating property, excellent insulation, corrosion resistance and high temperature stability. The ceramic bearing made of zirconia ceramic has the excellent performances of high rotation speed, wear resistance, corrosion resistance, high temperature resistance, insulation and long service life, and can be used in harsh working conditions.

[0003] At present, the existing ceramic bearing materials include zirconia, silicon nitride and silicon carbide, the thermal conductivity of the silicon nitride and silicon carbide ceramics is generally greater than or equal to 20 W / (m*K), and the thermal conductivity of the zirconia ceramic is 2.0-2.6 W / (m*K), so the heat dissipation performance of the zirconia ceramic bearing is relatively poor, the heat accumulation caused by high rotation friction damages the ceramic bearing, and the service life and service life stability of the ceramic bearing are affected. CONTENT OF THE INVENTION

[0004] In order to solve the technical problem of poor heat dissipation performance of the zirconia ceramic bearing, the application provides a ceramic bearing with a heat dissipation structure.

[0005] The ceramic bearing with a heat dissipation structure provided by the application is realized through the following scheme:

[0006] The ceramic bearing with a heat dissipation structure comprises a ceramic outer ring, a ceramic inner ring and a plurality of ceramic rolling balls arranged between the ceramic outer ring and the ceramic inner ring, a retainer is arranged between the ceramic outer ring and the ceramic inner ring; the ceramic rolling balls are arranged in the retainer and rotationally connected between the ceramic outer ring and the ceramic inner ring; the retainer is provided with a heat dissipation hole; and the retainer is connected with a fan blade, and the fan blade is located in the heat dissipation hole of the retainer.

[0007] During the rotation of the ceramic bearing, the retainer is also rotating, when the fan blade on the retainer rotates, the upper air is forced to "flow away" and a negative pressure is generated at the original position, and the lower air "flows into" the area due to the negative pressure, forming directional air flow, under the action of the fan blade, air pressure difference is formed on the front and back surfaces of the ceramic bearing, accelerating the air flow through the ceramic bearing, thereby achieving good heat dissipation effect on the ceramic bearing and reducing the damage of heat accumulation caused by friction to the ceramic bearing.

[0008] Preferably, an inner groove is arranged on the inner surface of the ceramic outer ring; an outer groove is arranged on the outer surface of the ceramic inner ring; and the ceramic rolling balls roll between the inner groove of the ceramic outer ring and the outer groove of the ceramic inner ring.

[0009] Preferably, the holder comprises a sleeve ring between the ceramic outer ring and the ceramic inner ring, a plurality of limiting members connected to the sleeve ring, and the ceramic balls are connected to adjacent limiting members in a rolling manner; the limiting members are provided with heat dissipation holes; the fan blade is detachably connected to the sleeve ring and located in the heat dissipation holes of the limiting members.

[0010] By adopting the above technical scheme, the holder can be quickly assembled and disassembled.

[0011] Preferably, the sleeve ring is provided with a plurality of through grooves; the ceramic balls are embedded in the outer grooves of the ceramic inner ring through the through grooves of the sleeve ring.

[0012] Preferably, the sleeve ring is provided with a threaded connection hole; the bottom of the fan blade is fixedly connected with a bolt joint, and the bolt joint is detachably connected to the threaded connection hole of the sleeve ring.

[0013] By adopting the above technical scheme, the holder can be quickly assembled and disassembled.

[0014] Preferably, the inner diameter of the sleeve ring is 1.00-1.005 times the outer diameter of the ceramic inner ring; the difference between the outer diameter of the sleeve ring and the inner diameter of the sleeve ring is 1.0-5.0 mm.

[0015] Preferably, the ceramic balls are spherical ceramic balls, the inner grooves are arc grooves, the diameter of the inner grooves is equal to the diameter of the ceramic balls, and the circumference of the inner grooves is l=kπd, k=0.02-0.16, and d is the diameter of the inner grooves.

[0016] Preferably, the ceramic balls are spherical ceramic balls, the outer grooves are arc grooves, the diameter of the outer grooves is equal to the diameter of the ceramic balls, and the circumference of the outer grooves is l=kπd, k=0.02-0.16, and d is the diameter of the inner grooves.

[0017] Preferably, a plurality of inner heat dissipation microgrooves are arranged in the inner grooves of the ceramic outer ring, and a plurality of outer heat dissipation microgrooves are arranged in the outer grooves of the ceramic inner ring.

[0018] By adopting the above technical scheme, the heat dissipation performance of the ceramic bearing can be improved.

[0019] In summary, the present application has the following advantages:

[0020] 1. The ceramic bearing in the present application has good heat dissipation effect, reduces the damage of heat accumulation caused by friction to the ceramic bearing, and thus improves the use stability and service life of the ceramic bearing.

[0021] 2. The holder in the present application can be quickly assembled and disassembled, and the maintenance cost of the ceramic bearing is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall structure schematic diagram of the ceramic shaft with heat dissipation structure in the application.

[0023] Figure 2 is the cross-sectional display diagram of the ceramic shaft with heat dissipation structure in the application.

[0024] In the figure, 1, ceramic outer ring; 11, inner groove; 111, inner heat dissipation micro groove; 2, ceramic inner ring; 21, outer groove; 211, outer heat dissipation micro groove; 3, ceramic ball; 4, retainer; 40, fan blade; 400, heat dissipation hole; 41, sleeve ring; 411, through groove; 42, limiting piece; 421, ball embedding groove. DETAILED DESCRIPTION

[0025] In order to further understand the creativity and technical progress of the application, the preferred embodiments of the application are discussed in detail below in combination with examples and drawings.

[0026] Example: Reference Figure 1 A ceramic bearing with heat dissipation structure includes a ceramic outer ring 1, a ceramic inner ring 2, a retainer 4 and a ceramic ball 3, wherein the ceramic outer ring 1, the ceramic inner ring 2 and the ceramic ball 3 are all zirconia ceramics, and the retainer 4 can be selected from any one of polytetrafluoroethylene, nylon 66, polyetherimide, zirconia, silicon nitride, silicon carbide, stainless steel, aviation aluminum and copper alloy according to the application working condition.

[0027] From the heat dissipation performance of the ceramic bearing, the retainer 4 is selected from any one of stainless steel, aviation aluminum and copper alloy, which can improve the overall heat dissipation performance of the ceramic bearing.

[0028] From the production cost and processing difficulty of the ceramic bearing, the retainer 4 is selected from polytetrafluoroethylene, nylon 66 and polyetherimide, which can reduce the overall quality, production cost and processing difficulty of the ceramic bearing.

[0029] From the resistant working condition of the ceramic bearing, the retainer 4 is selected from any one of zirconia, silicon nitride and silicon carbide, which can make the ceramic bearing have better corrosion resistance, high temperature resistance and wear resistance.

[0030] Reference Figure 1 and Figure 2 The inner surface of the ceramic outer ring 1 is provided with an inner groove 11, and the ceramic ball 3 can be embedded in the inner groove 11 of the ceramic outer ring 1. The outer surface of the ceramic inner ring 2 is provided with an outer groove 21, and the ceramic ball 3 can be embedded in the outer groove 21 of the ceramic inner ring 2. The ceramic ball 3 rolls between the inner groove 11 of the ceramic outer ring 1 and the outer groove 21 of the ceramic inner ring 2.

[0031] Reference Figure 2The ceramic bearing in the application is self-lubricating, and does not need to add lubricating oil. In order to give the zirconia ceramic bearing better heat dissipation performance, a plurality of well-shaped inner heat dissipation microgrooves 111 are arranged in the inner groove 11 of the ceramic outer ring 1, and a plurality of well-shaped outer heat dissipation microgrooves 211 are arranged in the outer groove 21 of the ceramic inner ring 2.

[0032] With reference to Figure 1 And Figure 2 The ceramic ball 3 is a spherical ceramic ball, the inner groove 11 of the ceramic outer ring 1 is an arc-shaped groove, and the diameter of the inner groove 11 is equal to the diameter of the ceramic ball 3, so that the ceramic ball 3 can be embedded in the inner groove 11 of the ceramic outer ring 1. The circumference l of the inner groove 11 of the ceramic outer ring 1 is kπd, k=0.02-0.16, and d is the diameter of the inner groove 11 in the ceramic outer ring 1. K represents the arc angle of the inner groove 11, and k is preferably k=0.1, that is, the arc angle of the inner groove 11 is 30-36°.

[0033] With reference to Figure 1 And Figure 2 The ceramic ball 3 is a spherical ceramic ball, the outer groove 21 of the ceramic inner ring 2 is an arc-shaped groove, and the diameter of the outer groove 21 is equal to the diameter of the ceramic ball 3, so that the ceramic ball 3 can be embedded in the outer groove 21 of the ceramic inner ring 2. The circumference l of the outer groove 21 of the ceramic inner ring 2 is kπd, k=0.02-0.16, and d is the diameter of the inner groove 11. K represents the arc angle of the outer groove 21, and k is preferably k=0.1, that is, the arc angle of the inner groove 11 is 30-36°.

[0034] With reference to Figure 1 And Figure 2 When the ceramic bearing is assembled, the retainer 4 is first sleeved on the ceramic inner ring 2, then the ceramic ball 3 is arranged on the retainer 4 to obtain a semi-finished bearing, and finally the ceramic outer ring 1 is assembled on the semi-finished bearing to obtain a finished ceramic bearing. The retainer 4 is installed between the ceramic outer ring 1 and the ceramic inner ring 2. The ceramic ball 3 is rolling connected to the retainer 4, and the ceramic ball 3 is rolling connected to the inner groove 11 of the ceramic outer ring 1 and the outer groove 21 of the ceramic inner ring 2, that is, the ceramic ball 3 is rolling connected between the ceramic outer ring 1 and the ceramic inner ring 2.

[0035] With reference to Figure 1 And Figure 2, the retainer 4 is made of polytetrafluoroethylene, the retainer 4 comprises a sleeve ring 41 located between the ceramic outer ring 1 and the ceramic inner ring 2, the inner diameter of the sleeve ring 41 is equal to 0.995-1.005 times the outer diameter of the ceramic inner ring 2, preferably, the inner diameter of the sleeve ring 41 is equal to 1.005 times the outer diameter of the ceramic inner ring 2, the sleeve ring 41 is sleeved on the ceramic inner ring 2 with a certain gap, facilitating assembly of the ceramic ball 3. The difference between the outer diameter of the sleeve ring 41 and the inner diameter of the sleeve ring 41 is 1.0-5.0mm, preferably, the difference between the outer diameter of the sleeve ring 41 and the inner diameter of the sleeve ring 41 is 2.5-4.0mm.

[0036] Reference Figure 1 and Figure 2 The sleeve ring 41 is provided with a plurality of through grooves 411, the ceramic ball 3 is embedded in the outer groove 21 of the ceramic inner ring 2 by penetrating the through groove 411 of the sleeve ring 41. A plurality of limiting members 42 are detachably connected to the sleeve ring 41, specifically, the limiting members 42 are clamped to the sleeve ring 41. The limiting members 42 are formed with ball embedding grooves 421 on the side surface. The ceramic ball 3 is rollingly connected in the ball embedding grooves 421 between adjacent limiting members 42. The bottom of the limiting member 42 is provided with a heat dissipation hole 400, the heat dissipation hole 400 is directed to the same direction as the opening direction of the ceramic inner ring 2. The distance between the arc-shaped top of the limiting member 42 and the inner wall of the ceramic outer ring 1 is controlled to be 0.0-0.10mm.

[0037] Reference Figure 1 and Figure 2 The fan blade 40 is detachably connected to the sleeve ring 41, and the fan blade 40 is located in the heat dissipation hole 400 of the limiting member 42. Specifically, a plurality of threaded connection holes are formed on the outer surface of the sleeve ring 41. The bottom of the fan blade 40 is fixedly connected with a bolt joint, and the detachable connection (threaded connection) of the fan blade 40 to the sleeve ring 41 is realized through the bolt joint of the fan blade 40, facilitating assembly, disassembly and maintenance of the retainer 4.

[0038] The embodiments of the specific implementation are the preferred embodiments of the application, but do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A ceramic bearing with heat dissipation structure, comprising a ceramic outer ring (1), a ceramic inner ring (2) and a plurality of ceramic balls (3) arranged between the ceramic outer ring (1) and the ceramic inner ring (2), characterized in that: The ceramic outer ring (1) and the ceramic inner ring (2) are provided with a retainer (4); the ceramic ball (3) is arranged in the retainer (4) and rotationally connected between the ceramic outer ring (1) and the ceramic inner ring (2); the retainer (4) is provided with a heat dissipation hole (400); the retainer (4) is connected with a fan blade (40), and the fan blade (40) is located in the heat dissipation hole (400) of the retainer (4); the inner surface of the ceramic outer ring (1) is provided with an inner groove (11); the outer surface of the ceramic inner ring (2) is provided with an outer groove (21); the ceramic ball (3) rolls between the inner groove (11) of the ceramic outer ring (1) and the outer groove (21) of the ceramic inner ring (2); the retainer (4) comprises a sleeve ring (41) located between the ceramic outer ring (1) and the ceramic inner ring (2) and a plurality of limiting members (42) connected to the sleeve ring (41), and the ceramic ball (3) is rollingly connected between adjacent limiting members (42); the limiting member (42) is provided with a heat dissipation hole (400); the fan blade (40) is detachably connected to the sleeve ring (41) and located in the heat dissipation hole (400) of the limiting member (42).

2. The ceramic bearing with heat dissipation structure according to claim 1, characterized in that: The sleeve ring (41) is provided with a plurality of through grooves (411); the ceramic ball (3) is embedded in the outer groove (21) of the ceramic inner ring (2) by passing through the through groove (411) of the sleeve ring (41).

3. The ceramic bearing with heat dissipation structure according to claim 1, characterized in that: The inner diameter of the sleeve ring (41) is 0.995-1.005 times the outer diameter of the ceramic inner ring (2); the difference between the outer diameter of the sleeve ring (41) and the inner diameter of the sleeve ring (41) is 1.0-5.0 mm.

4. The ceramic bearing with heat sink structure of claim 1, wherein: When the ceramic ball (3) is a spherical ceramic ball, the inner groove (11) is an arc-shaped groove, the diameter of the inner groove (11) is equal to the diameter of the ceramic ball (3), and the circumference l of the inner groove (11) is kπd, wherein k=0.02-0.16 and d is the diameter of the inner groove (11).

5. The ceramic bearing with heat sink structure of claim 4, wherein: When the ceramic ball (3) is a spherical ceramic ball, the outer groove (21) is an arc-shaped groove, the diameter of the outer groove (21) is equal to the diameter of the ceramic ball (3), and the circumference l of the outer groove (21) is kπd, wherein k=0.02-0.16 and d is the diameter of the inner groove (11).

6. The ceramic bearing with heat sink structure of claim 5, wherein: The inner groove (11) of the ceramic outer ring (1) is provided with a plurality of inner heat dissipation microgrooves (111), and the outer groove (21) of the ceramic inner ring (2) is provided with a plurality of outer heat dissipation microgrooves (211).

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