Bearing heat dissipation device

Abstract

The application relates to the technical field of bearing heat dissipation, in particular to a bearing heat dissipation device which comprises a device body, the device body comprises a bearing body and a screw rod, the bearing body comprises an inner ring, an outer ring and balls, the screw rod is fixedly installed in the inner ring, a heat dissipation flow channel filled with cooling liquid is formed between the inner ring and the outer ring, the balls are located in the heat dissipation flow channel and partially immerse in the cooling liquid, the device body further comprises a liquid inlet, a liquid outlet, an external oil cooling device and a heat conduction structure, the liquid inlet and the liquid outlet are located at two ends of the bearing body, and the liquid inlet and the liquid outlet are in communication with the heat dissipation flow channel. Through cooling liquid circulation and the heat conduction structure, the bearing body is subjected to double heat dissipation in a mode of combination of liquid cooling and solid cooling, and the local high-temperature problem of the bearing body during high-speed operation is solved.

Description

Technical Field

[0001] This application relates to the technical field of bearing heat dissipation, and in particular to a bearing heat dissipation device. Background Technology

[0002] Bearings are generally composed of an inner ring, an outer ring, and balls. The transmission of force and motion support are achieved by the rolling of the balls between the inner and outer rings. In machine tools, the lead screw and the inner ring of the bearing are often fixed by means of interference fit, key connection, etc., while the outer ring of the bearing is rigidly connected to the machine tool housing, which directly affects the feed accuracy, running stability and machining efficiency of the machine tool.

[0003] Bearings inevitably generate heat during machine tool operation, with the contact area between the balls and the inner and outer rings being the main heat source. When the balls rotate at high speed, they form point contact with the inner and outer rings, and the contact area is subjected to extremely high contact stress. At the same time, the difference in speed between the ball's rotation and revolution generates a small amount of sliding friction, resulting in intense local frictional heat generation. Moreover, the heat is concentrated at discrete contact points, easily forming local high temperatures.

[0004] The most common heat dissipation method is to install heat dissipation fins or other heat dissipation structures on the outside of the bearing housing. This relies on natural air convection for heat dissipation. The heat needs to be conducted from the contact point to the bearing housing and then dissipated. The path is long, the heat dissipation efficiency is low, and it is difficult to quickly remove the concentrated heat at the contact point inside the bearing.

[0005] Therefore, a bearing heat dissipation device is needed to solve the problems of heat concentration and low heat dissipation efficiency at the contact points on the inner and outer rings of the bearing. Summary of the Invention

[0006] In order to enable the contact points of the inner and outer rings of the bearing to come into direct contact with the liquid, and to accelerate the heat dissipation of the bearing by combining the cooling liquid and the heat-conducting structure, this application provides a bearing heat dissipation device.

[0007] This application provides a bearing heat dissipation device, which adopts the following technical solution:

[0008] A bearing heat dissipation device includes a device body, which includes a bearing housing and a lead screw. The bearing housing includes an inner ring, an outer ring, and balls. The lead screw is fixedly installed in the inner ring. A heat dissipation channel containing coolant is formed between the inner ring and the outer ring. The balls are located in the heat dissipation channel and are partially immersed in the coolant. The device body also includes a liquid inlet, a liquid outlet, an external oil cooling device, and a heat-conducting structure. The liquid inlet and outlet are located at opposite ends of the bearing housing and are connected to the heat dissipation channel. One end of the external oil cooling device is connected to the liquid inlet, and the other end is connected to the liquid outlet. The coolant in the heat dissipation channel can circulate between the external oil cooling devices. The heat-conducting structure is fixedly installed on the bearing housing and is used to conduct heat from the heat dissipation channel to the bearing housing.

[0009] By adopting the above technical solution, the heat dissipation channel is located between the inner and outer rings, and the ball bearings are partially immersed in the coolant. The coolant directly contacts the ball bearings, as well as the inner and outer rings. An external oil cooling device inputs low-temperature coolant into the heat dissipation channel through the inlet. After absorbing the heat generated by the friction of the ball bearings, the coolant flows back to the external oil cooling device from the outlet for cooling and circulation. The heat-conducting structure on the bearing housing conducts the heat inside the heat dissipation channel to the outside of the heat dissipation channel, further enhancing the cooling effect on the bearing housing. Compared with the prior art, this application achieves dual heat dissipation of the bearing housing by combining liquid cooling and solid cooling through coolant circulation and heat-conducting structure, thus solving the problem of local high temperature when the bearing housing is running at high speed.

[0010] Optionally, the heat-conducting structure includes an internal heat-conducting component, which includes a first heat-conducting pipe, a first liquid-absorbing core, and a first heat transfer medium. The first heat-conducting pipe is fixedly installed on the inner ring and includes a first evaporation section, a first insulation section, and a first condensation section arranged sequentially. The first evaporation section is located within the heat dissipation channel, the first insulation section is located within the inner ring, and the first condensation section is located within the lead screw. The first liquid-absorbing core is disposed on the inner wall of the first heat-conducting pipe, and the first heat transfer medium is disposed within the first heat-conducting pipe. The first heat transfer medium can transfer heat from the first evaporation section to the first condensation section and release heat. The first liquid-absorbing core is used to return the first heat transfer medium after heat release to the first evaporation section.

[0011] By adopting the above technical solution, the first evaporation section is located in the heat dissipation channel. The first heat transfer medium in the first heat pipe absorbs heat, reducing the temperature of the coolant and the heat dissipation channel. After absorbing heat, the first heat transfer medium vaporizes into a high-pressure gas. Driven by the pressure difference, the gaseous first heat transfer medium spontaneously flows to the low-pressure first condensation section. The temperature of the first condensation section is lower than the temperature of the first heat transfer medium. After releasing heat, the first heat transfer medium liquefies, and the released heat is transferred to the lead screw. The first liquid suction core uses capillary force to return the liquid first heat transfer medium to the first evaporation section, forming a phase change heat transfer cycle, which quickly transfers the heat in the heat dissipation channel to the lead screw, reducing the temperature inside the bearing body.

[0012] Optionally, the lead screw is provided with a heat dissipation strip extending along the axial direction of the lead screw, and the heat dissipation strip is connected to the end of the first condensation section so that heat can diffuse along the axial direction of the lead screw.

[0013] By adopting the above technical solution, the heat dissipation strip is connected to the end of the first condensation section. The heat released by the first condensation section is transferred to the heat dissipation strip and diffuses along the heat dissipation strip along the screw axis. The heat is also dissipated outward through other structures in contact with the screw, avoiding heat concentration in the local area of ​​the screw and accelerating the heat diffusion efficiency.

[0014] Optionally, the heat-conducting structure includes an external heat-conducting component, which includes a second heat-conducting pipe, a second liquid-absorbing core, and a second heat transfer medium. The second heat-conducting pipe is fixedly installed on the outer ring and includes a second evaporation section, a second insulation section, and a second condensation section arranged sequentially. The second evaporation section is located within the heat dissipation channel, the second insulation section is located within the outer ring, and the second condensation section is located at the outer edge of the outer ring. The second liquid-absorbing core is disposed on the inner wall of the second heat-conducting pipe, and the second heat transfer medium is disposed within the second heat-conducting pipe. The second heat transfer medium can transfer heat from the second evaporation section to the second condensation section and release heat. The second liquid-absorbing core is used to return the second heat transfer medium after heat release to the second evaporation section.

[0015] By adopting the above technical solution, the second evaporation section is located in the heat dissipation channel. The second heat transfer medium absorbs heat from the heat dissipation channel and then vaporizes. The second heat transfer medium absorbs heat and vaporizes into a high-pressure gas. Driven by the pressure difference, the gaseous second heat transfer medium flows to the second condensation section, releases heat to the outside, and then liquefies. The second liquid suction core returns the liquid second heat transfer medium to the second evaporation section, thereby realizing the direct transfer of heat from the heat dissipation channel to the bearing body. It forms an internal and external dual heat conduction path with the internal heat conduction component, dissipating the heat in the heat dissipation channel to the lead screw and the outer side of the outer ring, respectively, further improving the overall heat dissipation efficiency of the bearing body.

[0016] Optionally, the outer ring is provided with an oil return pipe, one end of which is connected to the liquid outlet and the other end is connected to the heat dissipation channel. The end of the second condensation section is located inside the oil return pipe to reduce the temperature of the second condensation section.

[0017] By adopting the above technical solution, the end of the second condensing section extends into the return oil pipe. When the coolant flows through the return oil pipe, it can directly contact the end of the second condensing section, quickly absorb the heat of the second condensing section, assist the second condensing section in cooling down, thereby accelerating the liquefaction of the gaseous second heat transfer medium and reusing the returned coolant. There is no need to set up an additional cooling structure for the second condensing section.

[0018] Optionally, the heat dissipation channel surrounds the outer circumference of the inner ring, and the inner wall of the heat dissipation channel is provided with a protrusion to increase the contact area between the inner wall of the heat dissipation channel (5) and the coolant.

[0019] By adopting the above technical solution, the inner wall of the heat dissipation channel is provided with a protrusion, which increases the contact area between the coolant and the inner wall of the heat dissipation channel. The protrusion can also be used to disrupt the flow trajectory of the coolant, form local turbulence, enhance the heat exchange efficiency between the coolant and the inner wall of the heat dissipation channel and the ball bearings, and accelerate the transfer of heat from the bearing body to the coolant. On the other hand, the protrusion can enhance the structural strength of the channel wall.

[0020] Optionally, the bearing body is equipped with a first seal and a second seal at the connection between the inner ring and the outer ring, and the first seal and the second seal are distributed at both ends of the heat dissipation channel.

[0021] By adopting the above technical solution, the first seal and the second seal respectively seal the two ends of the connection between the inner ring and the outer ring, preventing the coolant in the heat dissipation channel from leaking out of the gap, ensuring the normal circulation of the coolant in the heat dissipation channel, and maintaining the heat dissipation effect.

[0022] Optionally, the radial width of the heat dissipation channel near the outlet is greater than the radial width near the inlet to reduce the flow resistance of the coolant.

[0023] By adopting the above technical solution, the radial width of the heat dissipation channel near the outlet is greater than that at the inlet, which reduces the flow resistance of the coolant from the inlet to the outlet, making the coolant flow velocity in the channel more uniform.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The coolant directly contacts the balls, inner ring, and outer ring, which can absorb the heat generated by the friction of the balls. The heat-conducting structure on the bearing body can conduct the heat in the heat dissipation channel to the outside of the heat dissipation channel more quickly. Compared with the prior art, this application achieves dual heat dissipation of the bearing body by combining liquid cooling and solid cooling through coolant circulation and heat-conducting structure, thus solving the problem of local high temperature when the bearing body is running at high speed.

[0026] 2. The heat sink is connected to the end of the first condensation section. The heat released by the first condensation section is transferred to the heat sink and then diffuses from the heat sink along the screw axis. The heat is dissipated outward through other structures in contact with the screw, avoiding heat concentration in the local area of ​​the screw and accelerating the heat diffusion efficiency.

[0027] 3. The end of the second condensing section extends into the return oil pipe. When the coolant flows through the return oil pipe, it can directly contact the end of the second condensing section, quickly absorb the heat of the second condensing section, assist the second condensing section in cooling down, thereby accelerating the liquefaction of the gaseous second heat transfer medium and reusing the returned coolant. There is no need to set up an additional cooling structure for the second condensing section. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of an embodiment of the present application, used to illustrate the overall structure of the device body;

[0029] Figure 2 This is a partial cross-sectional view of the transmission end bearing in an embodiment of this application, used to show the location of the heat dissipation channel;

[0030] Figure 3 for Figure 2 An enlarged schematic diagram of section A in the middle is used to show the specific structure of the internal heat-conducting component;

[0031] Figure 4 for Figure 2 The enlarged schematic diagram of section B in the middle is used to show the specific structure of the external heat conduction component.

[0032] Reference numerals: 1. Device body; 111. Bearing body; 112. Transmission end bearing; 113. Tail end bearing; 114. Lead screw; 1141. Mounting hole; 1142. Center hole; 1143. Heat dissipation strip; 1144. Thermal conductive adhesive; 115. First seal; 116. Second seal; 2. Inner ring; 3. Outer ring; 311. Oil return pipe; 4. Ball bearing; 5. Heat dissipation channel; 511. Liquid inlet; 512. Liquid outlet; 513. Protrusion; 6. External oil cooling device 7. Thermal conductive structure; 711. Internal thermal conductive component; 712. First thermal conductive pipe; 7121. First evaporation section; 7122. First insulation section; 7123. First condensation section; 713. First liquid absorber; 714. First heat transfer medium; 721. External thermal conductive component; 722. Second thermal conductive pipe; 7221. Second evaporation section; 7222. Second insulation section; 7223. Second condensation section; 723. Second liquid absorber; 724. Second heat transfer medium; 8. Filtration device. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] Example:

[0035] A bearing heat dissipation device, reference Figure 1 and Figure 2 The device includes a main body 1, which includes a bearing body 111 and a lead screw 114. The bearing body 111 is used for positioning and supporting the lead screw 114. The bearing body 111 includes an inner ring 2, an outer ring 3, and balls 4. The lead screw 114 is coaxially fixed with the inner ring 2 and rotates synchronously with the inner ring 2. The balls 4 are located between the inner ring 2 and the outer ring 3. When the lead screw 114 rotates with the inner ring 2, the balls 4 roll between the raceways of the inner ring 2 and the outer ring 3. A heat dissipation channel 5 is formed between the inner ring 2 and the outer ring 3. The heat dissipation channel 5 is a sealed cavity structure filled with coolant. The balls 4 are located in the heat dissipation channel 5 and are partially immersed in the coolant. The balls 4 are in direct contact with the coolant to achieve efficient heat dissipation. Figure 3The device body 1 also includes a liquid inlet 511, a liquid outlet 512, an external oil cooling device 6, and a heat-conducting structure 7. The liquid inlet 511 and the liquid outlet 512 are located at both ends of the bearing body 111, and are connected to the heat dissipation channel 5. The external oil cooling device 6 is connected to the liquid inlet 511 and the liquid outlet 512 through pipes. The specific path of the coolant is as follows: the coolant is output from the external oil cooling device 6, enters the heat dissipation channel 5 through the liquid inlet 511, and completes the heat dissipation process. After exchange, the coolant flows back to the external oil cooling device 6 through the outlet 512, realizing continuous cooling and recycling of the coolant. The bearing body 111 has a groove for fixing the heat-conducting structure 7. The heat-conducting structure 7 is fixed in the groove by embedding. The heat-conducting structure 7 can directly contact the coolant, thereby transferring the heat inside the heat dissipation channel 5 to the outside of the bearing body 111 more efficiently. The heat-conducting structure 7 and the coolant circulation form a dual heat dissipation, further enhancing the heat dissipation effect of the bearing body 111.

[0036] refer to Figure 2 and Figure 3 The heat-conducting structure 7 includes an inner heat-conducting component 711, which includes a first heat-conducting pipe 712, a first liquid-absorbing core 713, and a first heat transfer medium 714. In this embodiment, the first heat-conducting pipe 712 is made of brass and has a negative pressure cavity inside. The first liquid-absorbing core 713 is a porous sintered core with good capillary suction. The first heat transfer medium 714 includes deionized water and has good thermal conductivity. The first heat-conducting pipe 712 is fixedly installed on the inner ring 2. When the bearing body 111 is working, the first heat-conducting pipe 712 rotates synchronously with the inner ring 2. 712 includes a first evaporation section 7121, a first insulation section 7122, and a first condensation section 7123. The first evaporation section 7121, the first insulation section 7122, and the first condensation section 7123 are sequentially connected and sealed together. The first evaporation section 7121 is located in the heat dissipation channel 5 and is in direct contact with the coolant. The first heat transfer medium 714 is disposed in the first heat conduction pipe 712. Since the inside of the first heat conduction pipe 712 is a negative pressure environment, the boiling point of the first heat transfer medium 714 is greatly reduced. The first heat transfer medium 714 can quickly absorb heat and vaporize in the first evaporation section 7121, thereby reducing the temperature in the heat dissipation channel 5.

[0037] refer to Figure 2 and Figure 3The first insulating section 7122 is located in the inner ring 2 and is covered with a heat insulation layer on its outside, so that the first insulating section 7122 can prevent heat from diffusing out of the first heat pipe 712, ensuring that heat is stably transferred from the first evaporation section 7121 to the first condensation section 7123; the pressure at the first evaporation section 7121 is greater than the pressure at the first condensation section 7123, and under the action of the pressure difference, the gaseous first heat transfer medium 714 flows through the first insulating section 7122 to the first condensation section 7123. 7123 is located in the lead screw 114. The lead screw 114 has a mounting hole 1141 for accommodating the first condensing section 7123. The inner wall of the mounting hole 1141 and the first condensing section 7123 are filled with thermally conductive adhesive 1144 to accelerate the rapid heat release and liquefaction of the first heat transfer medium 714 in the first condensing section 7123. The first liquid suction core 713 is set on the inner wall of the first heat conduction tube 712 and fully covers it to ensure that the liquid first heat transfer medium 714 can quickly flow back to the first evaporation section 7121 in the first condensing section 7123.

[0038] refer to Figure 2 and Figure 3 The lead screw 114 has a pre-set central hole 1142, and a heat dissipation strip 1143 is embedded in the central hole 1142. The heat dissipation strip 1143 is arranged along the axial direction of the lead screw 114. The first condensation section 7123 passes through the mounting hole 1141 and is directly attached to the heat dissipation strip 1143. In this embodiment, the heat dissipation strip 1143 is made of high thermal conductivity copper strip, which can quickly absorb the heat released by the first condensation section 7123 and transfer it along the axial direction of the lead screw 114 to both ends of the lead screw 114. Heat dissipation is achieved through the external structure in contact with the lead screw 114 and natural convection.

[0039] refer to Figure 2 and Figure 4The heat-conducting structure 7 also includes an external heat-conducting component 721, which includes a second heat-conducting pipe 722, a second liquid-absorbing core 723, and a second heat transfer medium 724. The second heat-conducting pipe 722 is fixedly embedded in the outer ring 3. A negative pressure cavity is provided inside the second heat-conducting pipe 722. The second heat-conducting pipe 722 includes a second evaporation section 7221, a second insulation section 7222, and a second condensation section 7223 arranged sequentially. The second evaporation section 7221 is located in the heat dissipation channel 5 and is in direct contact with the coolant. The second insulation section 7222 is located in the outer ring 3 and is covered with a heat insulation layer. The second condensation section 7223 is located at the outer edge of the outer ring 3. The second heat transfer medium 724 is located inside the second heat-conducting pipe 722. The interior is under negative pressure, which significantly reduces the boiling point of the second heat transfer medium 724. Therefore, the second heat transfer medium 724 can quickly absorb heat from the coolant in the second evaporation section 7221 and then vaporize. The pressure at the second evaporation section 7221 is greater than the pressure at the second condensation section 7223. Under the action of the pressure difference, the gaseous second heat transfer medium 724 flows through the second adiabatic section 7222 to the second condensation section 7223. The gaseous second heat transfer medium 724 liquefies and releases heat in the second condensation section 7223, transferring the heat inside the heat dissipation channel 5 to the outer edge of the outer ring 3. The second liquid wick 723 completely covers the inner wall of the second heat conduction pipe 722. The liquid second heat transfer medium 724 flows back to the second evaporation section 7221 under the capillary suction of the second liquid wick 723.

[0040] refer to Figure 2 and Figure 4 The outer ring 3 is provided with an oil return pipe 311, which is arranged along the axial direction of the outer ring 3. One end of the oil return pipe 311 is connected to the liquid outlet 512, and the other end is connected to the heat dissipation channel 5. Part of the coolant in the heat dissipation channel 5 can enter the liquid outlet 512 through the oil return pipe 311. The end of the second condensing section 7223 is located inside the oil return pipe 311, so that the second condensing section 7223 can directly contact the returning coolant, which can quickly absorb the heat released by the second condensing section 7223, accelerate the liquefaction of the gaseous second heat transfer medium 724, and improve the heat utilization rate of the coolant.

[0041] refer to Figure 2 and Figure 3A first seal 115 and a second seal 116 are installed at the connection between the inner ring 2 and the outer ring 3. In this embodiment, the first seal 115 and the second seal 116 include sealing rings for sealing the heat dissipation channel 5. The heat dissipation channel 5 is arranged around the outer circumference of the inner ring 2 and can cover the contact area between the raceway of the inner ring 2, the raceway of the outer ring 3 and the ball 4, so as to achieve comprehensive heat dissipation of the inner ring 2, the outer ring 3 and the ball 4. The inner wall of the heat dissipation channel 5 is provided with a protrusion 513 to increase the contact area between the coolant and the inner wall of the heat dissipation channel 5, and can also disrupt the flow trajectory of the coolant, further enhancing the heat exchange efficiency between the bearing body 111 and the coolant.

[0042] refer to Figure 2 and Figure 3 The radial width of the heat dissipation channel 5 near the outlet 512 is greater than the radial width near the inlet 511, which reduces the flow resistance of the coolant from the inlet 511 to the outlet 512, thereby promoting the rapid discharge of the coolant with higher temperature after heat absorption, so as to accelerate the entry of the coolant with lower temperature into the heat dissipation channel 5.

[0043] refer to Figure 1 and Figure 2 In this embodiment, the bearing body 111 includes a transmission end bearing 112 and a tail end bearing 113. The transmission end bearing 112 and the tail end bearing 113 are respectively disposed at both ends of the lead screw 114, and the axis of the transmission end bearing 112 and the tail end bearing 113 coincides with that of the lead screw 114. The heat dissipation structure and principle of the transmission end bearing 112 and the tail end bearing 113 are similar.

[0044] refer to Figure 1 and Figure 2 In this embodiment, the transmission end bearing 112 is taken as an example. The tail end bearing 113 will not be described in detail here. The cooling fluid circulation path of the heat dissipation device of this application is as follows: After the cooling oil is output from the external oil cooling device 6, it is divided into two paths through the three-way connector: one path enters the heat dissipation channel 5 of the transmission end bearing 112 through the inlet 511 of the transmission end bearing 112, and the other path enters the heat dissipation channel 5 of the tail end bearing 113 through the inlet 511 of the tail end bearing 113. After heat exchange is completed, it is discharged through the outlet 512 of the transmission end bearing 112 and the outlet 512 of the tail end bearing 113. The external oil cooling device 6 is connected to the filter device 8. The cooling oil enters the filter device 8 through the three-way connector and flows back to the external oil cooling device 6 after being filtered by the filter device 8.

[0045] The implementation principle of this application embodiment is as follows: When the bearing body 111 is working, the inner ring 2 rotates synchronously with the lead screw 114. The balls 4 roll between the raceways of the inner ring 2 and the outer ring 3, generating heat. First, the coolant in the heat dissipation channel 5 provides initial heat dissipation to the interior of the bearing body 111, carrying away most of the heat. After the heat exchange is completed, the coolant in the heat dissipation channels 5 of the transmission end bearing 112 and the tail end bearing 113 is discharged from their respective outlets 512. After converging through the three-way connector, it flows back to the external oil cooling equipment 6, realizing continuous circulation of the coolant. At the same time, the internal heat conduction component 711 passes through the first evaporation... The evaporation section 7121 absorbs heat from the heat dissipation channel 5, the first heat transfer medium 714 vaporizes, and then flows to the first condensation section 7123 to liquefy and release heat. The heat is transferred to both ends of the lead screw 114 by the heat dissipation bar 1143 and discharged through the external structure and natural convection. The external heat conduction component 721 absorbs heat from the heat dissipation channel 5 through the second evaporation section 7221, the second heat transfer medium 724 vaporizes and enters the second condensation section 7223, and the return coolant in the return oil pipe 311 directly contacts the second condensation section 7223, accelerating the liquefaction of the second heat transfer medium 724 and further dissipating heat from the inside of the bearing body 111.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bearing heat dissipation device, comprising a device body (1), the device body (1) comprising a bearing body (111) and a lead screw (114), the bearing body (111) comprising an inner ring (2), an outer ring (3), and balls (4), the lead screw (114) being fixedly installed in the inner ring (2), characterized in that: A cooling channel (5) filled with coolant is formed between the inner ring (2) and the outer ring (3). The ball bearing (4) is located in the cooling channel (5) and partially immersed in the coolant. The device body (1) also includes an inlet (511), an outlet (512), an external oil cooling device (6), and a heat-conducting structure (7). The inlet (511) and outlet (512) are located at both ends of the bearing body (111). The inlet (511) and outlet (512) are connected to the cooling channel (5). One end of the external oil cooling device (6) is connected to the inlet (511), and the other end is connected to the outlet (512). The coolant in the cooling channel (5) can circulate between the external oil cooling devices (6). The heat-conducting structure (7) is fixedly installed on the bearing body (111). The heat-conducting structure (7) is used to conduct heat from the heat dissipation channel (5) to the outside of the bearing body (111). The heat-conducting structure (7) includes an inner heat-conducting component (711). The inner heat-conducting component (711) includes a first heat-conducting pipe (712). The first heat-conducting pipe (712) is fixedly installed on the inner ring (2). The first heat-conducting pipe (712) includes a first evaporation section (7121), a first insulation section (7122), and a first condensation section (7123) arranged sequentially. The first evaporation section (7121) is located in the heat dissipation channel (5). The first insulation section (7122) is located in the inner ring (2). A condensation section (7123) is located in the lead screw (114); the lead screw (114) is provided with a heat dissipation strip (1143) extending along the axial direction of the lead screw (114), the heat dissipation strip (1143) is connected to the end of the first condensation section (7123) so that heat can diffuse along the axial direction of the lead screw (114); the heat conduction structure (7) includes an external heat conduction component (721), the external heat conduction component (721) includes a second heat conduction pipe (722), the second heat conduction pipe (722) is fixedly installed on the outer ring (3), the second heat conduction pipe (722) includes a second evaporation section (7221), a second insulation section (7222), and a second condensation section (7223) arranged in sequence, the second evaporation section (7221) 21) Located within the heat dissipation channel (5), the second heat insulation section (7222) is located within the outer ring (3), and the second condensation section (7223) is located at the outer edge of the outer ring (3); the outer ring (3) is provided with an oil return pipe (311), one end of which is connected to the liquid outlet (512), and the other end is connected to the heat dissipation channel (5). The end of the second condensation section (7223) is located within the oil return pipe (311) to reduce the temperature of the second condensation section (7223). The other end of the oil return pipe (311) is located at the inlet end of the heat dissipation channel (5), and some of the coolant in the heat dissipation channel (5) can enter the liquid outlet (512) through the oil return pipe (311).

2. The bearing heat dissipation device according to claim 1, characterized in that: The internal heat-conducting component (711) includes a first liquid-absorbing core (713) and a first heat transfer medium (714). The first liquid-absorbing core (713) is disposed on the inner wall of the first heat-conducting pipe (712), and the first heat transfer medium (714) is disposed inside the first heat-conducting pipe (712). The first heat transfer medium (714) can transfer heat from the first evaporation section (7121) to the first condensation section (7123) and release heat. The first liquid-absorbing core (713) is used to return the first heat transfer medium (714) after releasing heat to the first evaporation section (7121).

3. The bearing heat dissipation device according to claim 1, characterized in that: The external heat-conducting component (721) includes a second liquid-absorbing core (723) and a second heat transfer medium (724). The second liquid-absorbing core (723) is disposed on the inner wall of the second heat-conducting pipe (722), and the second heat transfer medium (724) is disposed inside the second heat-conducting pipe (722). The second heat transfer medium (724) can transfer heat from the second evaporation section (7221) to the second condensation section (7223) and release heat. The second liquid-absorbing core (723) is used to return the second heat transfer medium (724) after releasing heat to the second evaporation section (7221).

4. A bearing heat dissipation device according to claim 1, characterized in that: The heat dissipation channel (5) surrounds the outer circumference of the inner ring (2), and the inner wall of the heat dissipation channel (5) is provided with a protrusion (513) to increase the contact area between the inner wall of the heat dissipation channel (5) and the coolant.

5. A bearing heat dissipation device according to claim 1, characterized in that: The bearing body (111) is equipped with a first seal (115) and a second seal (116) at the connection between the inner ring (2) and the outer ring (3), and the first seal (115) and the second seal (116) are distributed at both ends of the heat dissipation channel (5).

6. A bearing heat dissipation device according to claim 1, characterized in that: The radial width of the heat dissipation channel (5) near the liquid outlet (512) is greater than the radial width near the liquid inlet (511) to reduce the flow resistance of the coolant.

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