A bearing cooling box for a direct drive spindle

Abstract

The application discloses a bearing cooling box body for a direct drive spindle, and relates to the technical field of bearing cooling.The device comprises a pair of bearing shells arranged side by side, an upper cover box and a lower cover box which are assembled between the two bearing shells and can be buckled to form a cylindrical structure, and a main shaft is arranged in the box body.The inner part of each bearing shell is equipped with a matched outer bearing ring and an inner bearing ring, two circles of bearing balls are arranged between the inner and outer bearing rings, and the two ends of the main shaft respectively penetrate the corresponding inner bearing rings and extend outward.The application sets up a full-range sealing system composed of sealing clamps, sealing washers and sealing oil rings, can effectively prevent the leakage of cooling liquid and lubricating oil, and prevents the intrusion of external dust and impurities.Meanwhile, the independent lubrication and cooling split structure can reduce the bearing friction loss, continuously maintain the low-temperature operation state of the main shaft and the bearing, avoid problems such as high-temperature wear and precision attenuation, and effectively improve the operation stability and service life of the direct drive spindle.

Description

Technical Field

[0001] This invention relates to the field of bearing cooling technology, and more particularly to a bearing cooling housing for a direct-drive spindle. Background Technology

[0002] With the rapid development of the high-end precision machining industry, direct-drive spindles, with their advantages of high transmission efficiency, fast response speed, and high operating accuracy, are gradually replacing traditional drive spindles and are widely used in core equipment such as precision machine tools and CNC machining. As core rotating components, the spindle and bearings continuously generate frictional heat during high-speed operation. Therefore, the heat dissipation and protection performance of the matching cooling housing directly determines the spindle's machining accuracy and service life. Spindle bearing cooling technology in the industry has gradually evolved from simple perforated heat dissipation and passive natural heat dissipation to simple liquid cooling structures. Active heat dissipation is achieved by introducing coolant, which initially solves the problem of high temperature buildup in the spindle and adapts to the basic operating requirements of medium- and low-speed spindles, making it the current mainstream basic cooling solution in the industry.

[0003] Existing traditional spindle bearing cooling housings still have many shortcomings in practical applications, making them unsuitable for the precision operation requirements of high-speed direct-drive spindles. Traditional housing structures suffer from poor positioning and assembly accuracy, leading to circumferential and axial bearing misalignment, which can cause spindle vibration and precision deviations over long-term operation. Furthermore, their cooling structures are often simplistic, lacking regular circulation channels, resulting in chaotic coolant flow, uneven heat dissipation, low cooling efficiency, and a tendency for localized overheating. In addition, traditional housings have simple sealing structures, making them prone to coolant and lubricant leakage, allowing external dust to easily enter the bearing cavity, accelerating bearing wear. Disassembly and maintenance are also inconvenient, resulting in poor overall operational stability and a short service life, failing to meet the long-term, high-precision, and high-load operating conditions of high-end precision equipment. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art, and to propose a bearing cooling box for direct drive spindles.

[0005] To address the problems existing in the prior art, the present invention adopts the following technical solution: A bearing cooling housing for a direct-drive spindle includes a pair of bearing housings placed side by side. Between the pair of bearing housings are a pair of upper and lower cover boxes that interlock and close to form a cylindrical structure. A spindle is inserted inside the upper and lower cover boxes. Each bearing housing has an outer bearing ring and an inner bearing ring that are used in conjunction with each other. Two rings of bearing balls are rolled between the inner and outer bearing rings. The two ends of the spindle are respectively inserted into the inner bearing ring on the corresponding side and extend outward.

[0006] Preferably, a first ear seat is fixedly provided at each of the four corners of the upper cover box, and a second ear seat is fixedly provided at each of the four corners of the lower cover box. The first ear seat and the second ear seat located at the same position are connected by bolts. The mating surfaces of the upper cover box and the lower cover box are provided with sealing grooves, and sealing strips are filled between the two sets of opposite sealing grooves.

[0007] Preferably, a cooling gap cavity is formed between the outer circular surface of the spindle and the inner walls of the upper and lower cover boxes. The inner walls of the upper and lower cover boxes are provided with several continuous spiral grooves. A liquid injection hole is provided in the middle of the top surface of the upper cover box, and a liquid injection plug is inserted into the liquid injection hole.

[0008] Preferably, a pair of T-shaped plugs are fixedly inserted on the top surface of the upper cover box and the bottom surface of the lower cover box, and a pair of circulating pumps are fixedly installed at the front joint of the upper cover box and the lower cover box. The inlet and outlet ends of each circulating pump are connected and installed with liquid cooling pipes, and the outer end of each liquid cooling pipe is inserted into the T-shaped plug on the corresponding side.

[0009] Preferably, a pair of eye bolts are threaded into the two corners of the top surface of the bearing housing, a pair of support legs are fixedly installed at the two corners of the bottom surface of the bearing housing, and an oil injection hole for bearing lubrication is opened in the middle of the top surface of the bearing housing.

[0010] Preferably, an oil plug is detachably inserted inside the oil injection hole, and an oil inlet hole is opened in the middle of the top surface of the outer bearing ring, and the oil inlet hole is connected to the oil injection hole on the corresponding side.

[0011] Preferably, the inner ring wall of the bearing housing is provided with three limiting slots evenly distributed along the circumference, and the outer surface of the outer bearing ring is fixedly provided with three limiting blocks evenly distributed along the circumference, each of the limiting blocks being slidably inserted into the limiting slot on the corresponding side.

[0012] Preferably, a first annular cover plate and a second annular cover plate are respectively provided on both sides of the bearing housing, a pair of sealing gaskets are provided between the bearing housing and the first annular cover plate and the second annular cover plate, and the bearing housing, the first annular cover plate and the second annular cover plate are locked and fixed together by four through bolts.

[0013] Preferably, a first annular protrusion is fixedly provided on one side of the first annular cover plate, and a second annular protrusion is provided on one side of the second annular cover plate. The first annular protrusion and the second annular protrusion are respectively inserted into the bearing housing and abut against the two end faces of the outer bearing ring.

[0014] Preferably, both sides of the upper cover box and the lower cover box are provided with arc-shaped notches, a fixing retaining ring is fitted on the other side of the second annular cover plate, and a pair of arc-shaped protrusions are fixedly provided on the other side of the second annular cover plate. Each arc-shaped protrusion is slidably fitted into the arc-shaped notch on the corresponding side, and three equally spaced sealing oil rings are fixedly provided on the inner wall of the second annular cover plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, a combined box structure with upper and lower cover boxes and double bearing housings is adopted. Through the matching structure of arc-shaped convex plates and arc-shaped notches, and limiting blocks and limiting slots, the bearing assembly and the box are precisely positioned and assembled. At the same time, relying on the ear seat bolt locking, the annular cover plate limiting and the multiple sealing structure, the bearing can be efficiently fixed in both circumferential and axial directions, effectively avoiding the problem of bearing offset and loosening during the operation of the spindle. The overall structure is easy to disassemble and assemble, and the hoisting and support structure is perfect, which greatly reduces the difficulty of equipment assembly, handling and maintenance. 2. In this invention, an independent cooling gap cavity is constructed between the housing and the spindle. Combined with a continuously penetrating spiral groove on the inner wall, the contact area between the coolant and the spindle is effectively expanded, guiding the coolant to flow evenly along a fixed path. With the help of a circulating pump and liquid cooling pipes to form a closed-loop circulating cooling circuit, the coolant can continuously and dynamically circulate, quickly removing the heat generated by the friction between the spindle and bearings, avoiding local high temperature accumulation, solving the problems of uneven cooling and delayed heat dissipation of traditional spindles, and significantly improving the heat dissipation efficiency of the spindle. In summary, this invention features a multi-layered sealing protection structure, forming a comprehensive sealing system through sealing strips, gaskets, and oil rings. This effectively prevents coolant leakage and lubricant spillage, while also blocking external dust and impurities from entering the cavity. Combined with an independent lubrication and cooling structure, it ensures efficient bearing lubrication and reduces frictional losses while maintaining low-temperature operation of the spindle and bearings. This effectively avoids high-temperature wear, precision degradation, and other malfunctions, significantly improving the overall operational stability and service life of the direct-drive spindle. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram excluding spindle; Figure 4 This is a schematic diagram of the upper and lower cover boxes of the present invention; Figure 5 For the present invention Figure 4 Explosion-proof diagram of the structure; Figure 6 For the present invention Figure 5 A schematic cross-sectional view of the structure; Figure 7 This is a schematic diagram of a pair of bearing housing structures according to the present invention; Figure 8 For the present invention Figure 7 Explosion-proof diagram of the structure; Figure 9 For the present invention Figure 8 A schematic cross-sectional view of the structure; The numbers in the diagram are as follows: 100, main shaft; 101, upper cover box; 102, lower cover box; 103, spiral groove; 104, sealing strip; 105, liquid injection plug; 106, arc-shaped notch; 107, T-type plug; 108, circulating pump; 109, liquid cooling pipe; 200, bearing housing; 201, support leg; 202, oil injection plug; 203, lifting eye bolt; 204, sealing washer; 205, limiting groove; 206, first annular cover plate; 207, first annular protrusion; 208, second annular cover plate; 209, arc-shaped protrusion; 210, second annular protrusion; 211, long rod bolt; 300, inner bearing ring; 301, bearing ball; 302, outer bearing ring; 303, limiting block; 304, oil inlet; 305, fixing retaining ring; 306, sealing oil ring. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Example: This example provides a bearing cooling housing for a direct-drive spindle. See [link to example]. Figures 1 to 9 Specifically, it includes a pair of bearing housings 200 placed side by side. The bearing housings 200 provide a mounting base and protective cavity for the bearing assembly, and at the same time realize the positioning and assembly docking with the upper cover box 101 and the lower cover box 102. Between the pair of bearing housings 200, there is a pair of upper cover boxes 101 and lower cover boxes 102 that are interlocked and closed to form a cylindrical structure. The upper cover box 101 and the lower cover box 102 are equipped with a main shaft 100, which forms a cooling gap cavity. A spiral groove 103, a liquid injection hole and an arc-shaped notch 106 are provided, and at the same time, a mounting and fixing position is provided for the first ear seat, the T-type plug 107 and the circulation pump 108. Each bearing housing 200 has an outer bearing ring 302 and an inner bearing ring 300 installed inside for mutual use. The outer bearing ring 302 and the inner bearing ring 300 are matched and cooperate to provide an outer rolling track for the bearing balls 301. An oil inlet hole 304 is provided for the lubricating oil to enter. The circumferential limit is achieved by the limiting block 303 and the axial positioning is completed by the annular cover plate. Two rings of bearing balls 301 are rolled between the inner bearing ring 300 and the outer bearing ring 302 to reduce the frictional resistance during the rotation of the main shaft 100 and ensure that the main shaft 100 rotates smoothly. The two ends of the main shaft 100 are respectively inserted into the inner bearing ring 300 on the corresponding side and extend outward.

[0019] In the specific implementation process, such as Figure 5 and Figure 6 As shown, a first ear seat is fixedly installed at each of the four corners of the upper cover box 101, and a second ear seat is fixedly installed at each of the four corners of the lower cover box 102. The first ear seat and the second ear seat located at the same position are connected by bolts. The first ear seat, together with the second ear seat and the bolts, locks the upper cover box 101 and the lower cover box 102. The mating surfaces of the upper cover box 101 and the lower cover box 102 are provided with sealing grooves. A sealing strip 104 is filled between the two sets of opposite sealing grooves. The sealing strip 104 is filled and assembled between the two sets of opposite sealing grooves to seal the mating gap between the upper cover box 101 and the lower cover box 102 and prevent coolant leakage. A cooling gap cavity is formed between the outer circular surface of the spindle 100 and the inner walls of the upper cover box 101 and the lower cover box 102. The cooling gap cavity is used to contain and store coolant, providing a medium space for heat dissipation of the spindle 100. Several continuous spiral grooves 103 are opened on the inner walls of the upper cover box 101 and the lower cover box 102. The spiral grooves 103 guide the coolant to circulate continuously along a fixed path, improving the heat dissipation contact area and heat dissipation uniformity. A liquid injection hole is opened in the middle of the top surface of the upper cover box 101. A liquid injection plug 105 is detachably inserted into the liquid injection hole. After adding coolant, the liquid injection hole is sealed to prevent coolant leakage and impurities from entering the box. A pair of T-shaped plugs 107 are fixedly inserted on the top surface of the upper cover box 101 and the bottom surface of the lower cover box 102, respectively. The T-shaped plugs 107 are used to connect and fix the liquid cooling pipes 109 and connect the internal cooling circuit of the box. A pair of circulation pumps 108 are fixedly installed at the front joint of the upper cover box 101 and the lower cover box 102. The circulation pumps 108 provide power for the circulation of coolant and drive the coolant to form a closed loop. The inlet and outlet of each circulation pump 108 are connected to the liquid cooling pipes 109. The outer end of each liquid cooling pipe 109 is inserted into the T-shaped plug 107 on the corresponding side.

[0020] In the specific implementation process, such as Figure 8 and Figure 9As shown, a pair of eye bolts 203 are threaded into the two corners of the top surface of the bearing housing 200. The eye bolts 203 facilitate the hoisting, handling and assembly of the entire device. A pair of support legs 201 are fixedly installed at the two corners of the bottom surface of the bearing housing 200. The support legs 201 support the bearing housing 200 and the entire device and provide support, elevation and stable placement. An oil injection hole for bearing lubrication is opened in the middle of the top surface of the bearing housing 200. An oil filling plug 202 is removably inserted inside the oil filling hole. An oil inlet hole 304 is opened in the middle of the top surface of the outer bearing ring 302. The oil inlet hole 304 is connected to the oil filling hole on the corresponding side. After the oil filling is completed, the oil filling hole is sealed to prevent lubricating oil from leaking out and dust and impurities from entering the bearing. The inner ring wall of the bearing housing 200 is provided with three limiting slots 205 evenly distributed along the circumference. The outer surface of the outer bearing ring 302 is fixedly provided with three limiting blocks 303 evenly distributed along the circumference. Each limiting block 303 is slidably inserted into the limiting slot 205 on the corresponding side to realize the circumferential limiting assembly of the outer bearing ring 302 and the bearing housing 200. It should be noted that: such as Figure 8 and Figure 9 As shown, a first annular cover plate 206 and a second annular cover plate 208 are respectively provided on both sides of the bearing housing 200. The first annular cover plate 206 abuts against the end face of the positioning outer bearing ring 302 through the first annular protrusion 207. The second annular cover plate 208 achieves axial positioning of the outer bearing ring 302 by relying on the second annular protrusion 210. At the same time, an arc-shaped protrusion 209 is provided to achieve positioning and docking with the housing. A pair of sealing gaskets 204 are provided between the bearing housing 200 and the first annular cover plate 206 and the second annular cover plate 208. The sealing gaskets 204 seal the assembly gap and improve the airtight protection performance of the bearing cavity. The bearing housing 200, the first annular cover plate 206, and the second annular cover plate 208 are locked and fixed together by four through-bolts 211. A first annular protrusion 207 is fixedly provided on one side of the first annular cover plate 206. The first annular protrusion 207 is inserted into the bearing housing 200 and abuts against the end face of the outer bearing ring 302 to achieve axial positioning and fixation. A second annular protrusion 210 is provided on one side of the second annular cover plate 208. The second annular protrusion 210 is inserted into the bearing housing 200 and abuts against the other end face of the outer bearing ring 302 to complete the axial positioning of the bearing. The first annular protrusion 207 and the second annular protrusion 210 are respectively inserted into the bearing housing 200 and abut against the two end faces of the outer bearing ring 302. Both sides of the upper cover box 101 and the lower cover box 102 are provided with arc-shaped notches 106. The other side of the second annular cover plate 208 is fitted with a fixing retaining ring 305. The fixing retaining ring 305 is used to fill the gap between the second annular cover plate 208 and the upper cover box 101 and the lower cover box 102. A pair of arc-shaped protrusions 209 are fixedly provided on the other side of the second annular cover plate 208. Each arc-shaped protrusion 209 is slidably fitted into the arc-shaped notch 106 on the corresponding side to achieve precise positioning and assembly of the bearing housing 200 with the upper and lower housings. In addition, three equally spaced sealing oil rings 306 are fixedly provided on the inner wall of the second annular cover plate 208. The sealing oil rings 306 enhance the sealing effect of the bearing end and prevent lubricating oil leakage and external impurities from entering the bearing.

[0021] The working principle of this embodiment is as follows: First, the outer bearing ring 302 and the inner bearing ring 300, which are used in conjunction with each other, are assembled into the bearing housing 200. Then, the three circumferentially evenly distributed limiting blocks 303 on the outer surface of the outer bearing ring 302 are correspondingly slidably inserted into the limiting slots 205 on the inner ring wall of the bearing housing 200, thus completing the circumferential limiting assembly of the outer bearing ring 302 and the bearing housing 200 and preventing circumferential displacement during the operation of the bearing.

[0022] Subsequently, a first annular cover plate 206 and a second annular cover plate 208 are respectively installed on both sides of the bearing housing 200, and a pair of sealing washers 204 are added between the bearing housing 200 and the first annular cover plate 206 and the second annular cover plate 208. The three are then locked and fixed together as one unit by four through-type long bolts 211. During assembly, the first annular protrusion 207 of the first annular cover plate 206 and the second annular protrusion 210 of the second annular cover plate 208 are inserted into the bearing housing 200 and tightly abut against the two end faces of the outer bearing ring 302, thereby achieving axial positioning and fixing of the outer bearing ring 302. At the same time, the sealing oil ring 306 is used to ensure the sealing and protection effect of the bearing part.

[0023] After the bearing assembly is completed, the two ends of the spindle 100 are respectively inserted into the inner bearing rings 300 of the corresponding bearing housings 200 on both sides and extend outward to ensure that the spindle 100 can rotate stably with the help of the inner bearing rings 300, the outer bearing rings 302 and the two rings of bearing balls 301.

[0024] Then the upper cover box 101 and the lower cover box 102 are fastened together and closed, so that the arc-shaped protrusion 209 on the outer side of the second annular cover plate 208 slides and engages with the arc-shaped notches 106 on both sides of the upper cover box 101 and the lower cover box 102, thereby achieving the positioning and docking of the box body and the bearing housing 200. Then, the upper cover box 101 is locked and fixed by the first ear seat at the four corners of the upper cover box 101 and the second ear seat at the four corners of the lower cover box 102 with bolts. At the same time, the sealing strip 104 filled between the two sets of sealing grooves ensures the sealing of the mating surface between the upper cover box 101 and the lower cover box 102, so that the upper cover box 101, the lower cover box 102 and a pair of bearing housings 200 are firmly connected to form an integral box structure.

[0025] Before the equipment is put into operation, the bearing lubrication operation is completed: remove the oil plug 202 that can be detachably installed in the oil injection hole on the top surface of the bearing housing 200, and inject an appropriate amount of lubricating oil into the interlayer between the inner bearing ring 300 and the outer bearing ring 302 and the gap between the bearing balls 301 through the oil injection hole and the oil inlet hole 304 in the middle of the top surface of the outer bearing ring 302. After the oil injection is completed, reseal the oil plug 202 to achieve lubrication protection of the rotating parts of the bearing and reduce the bearing friction loss when the main shaft 100 rotates at high speed.

[0026] After the lubrication process is completed, the cooling system is replenished: the injection plug 105 in the injection hole in the middle of the top surface of the upper cover box 101 is removed, and an appropriate amount of coolant is injected into the cooling gap cavity formed between the inner wall of the upper cover box 101 and the lower cover box 102 and the outer circular surface of the spindle 100 through the injection hole. The coolant fills the internal space of the box and is evenly distributed along the outer surface of the spindle 100 in the continuously penetrating spiral groove 103 inside the box.

[0027] After the liquid replenishment is completed, the liquid injection plug 105 is reset, and a pair of circulation pumps 108 installed at the front docking point of the upper cover box 101 and the lower cover box 102 are started. The circulation pumps 108 form a closed-loop cooling circuit through the matching liquid cooling pipe 109 and the T-shaped plugs 107 inserted on the upper and lower sides of the box, continuously drawing coolant from the bottom of the cooling gap cavity and transporting the coolant back to the top of the cooling gap cavity, causing the coolant to continuously circulate along the spiral groove 103 on the outer surface of the spindle 100.

[0028] During the high-speed operation of the spindle 100, the continuously circulating coolant can efficiently remove the heat generated by the rotational friction between the spindle 100 and the bearing, quickly reduce the working temperature of the spindle 100 and the bearing assembly, avoid the problems of bearing wear and spindle precision reduction caused by high temperature accumulation, effectively ensure the overall stability and service life of the direct drive spindle, and achieve continuous and efficient cooling of the bearing and spindle.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A bearing cooling housing for a direct-drive spindle, comprising a pair of bearing housings (200) arranged side by side, characterized in that: A pair of upper cover boxes (101) and lower cover boxes (102) are provided between the pair of bearing housings (200) to form a cylindrical structure after being interlocked and closed. A main shaft (100) is inserted inside the upper cover box (101) and the lower cover box (102). Each bearing housing (200) is equipped with an outer bearing ring (302) and an inner bearing ring (300) for mutual use. Two rings of bearing balls (301) are rolled between the inner bearing ring (300) and the outer bearing ring (302). The two ends of the main shaft (100) are respectively inserted into the inner bearing ring (300) on the corresponding side and extend outward.

2. A bearing cooling housing for a direct-drive spindle according to claim 1, characterized in that: The upper cover box (101) is fixedly provided with a first ear seat at the four corners, and the lower cover box (102) is fixedly provided with a second ear seat at the four corners. The first ear seat and the second ear seat located at the same position are connected by bolts. The mating surfaces of the upper cover box (101) and the lower cover box (102) are provided with sealing grooves, and sealing strips (104) are filled between the two sets of sealing grooves.

3. A bearing cooling housing for a direct-drive spindle according to claim 1, characterized in that: A cooling gap cavity is formed between the outer circular surface of the main shaft (100) and the inner walls of the upper cover box (101) and the lower cover box (102). Several continuous spiral grooves (103) are opened on the inner walls of the upper cover box (101) and the lower cover box (102). A liquid injection hole is opened in the middle of the top surface of the upper cover box (101), and a liquid injection plug (105) is inserted into the liquid injection hole.

4. A bearing cooling housing for a direct-drive spindle according to claim 1, characterized in that: A pair of T-shaped plugs (107) are fixedly inserted on the top surface of the upper cover box (101) and the bottom surface of the lower cover box (102). A pair of circulating pumps (108) are fixedly installed at the front joint of the upper cover box (101) and the lower cover box (102). A liquid cooling pipe (109) is connected to the liquid inlet and liquid outlet of the circulating pump (108). The outer end of the liquid cooling pipe (109) is inserted into the T-shaped plug (107) on the corresponding side.

5. A bearing cooling housing for a direct-drive spindle according to claim 1, characterized in that: A pair of eye bolts (203) are threaded into the two corners of the top surface of the bearing housing (200), a pair of support legs (201) are fixedly installed at the two corners of the bottom surface of the bearing housing (200), and an oil injection hole is opened in the middle of the top surface of the bearing housing (200).

6. A bearing cooling housing for a direct-drive spindle according to claim 5, characterized in that: An oil plug (202) is inserted inside the oil injection hole, and an oil inlet hole (304) is opened in the middle of the top surface of the outer bearing ring (302). The oil inlet hole (304) is connected to the oil injection hole on the corresponding side.

7. A bearing cooling housing for a direct-drive spindle according to claim 1, characterized in that: The inner ring wall of the bearing housing (200) is provided with three limiting slots (205), and the outer surface of the outer bearing ring (302) is fixedly provided with three limiting blocks (303). The limiting blocks (303) are slidably inserted into the limiting slots (205) on the corresponding side.

8. A bearing cooling housing for a direct-drive spindle according to claim 1, characterized in that: The bearing housing (200) is provided with a first annular cover plate (206) and a second annular cover plate (208) on both sides respectively. A pair of sealing gaskets (204) are provided between the bearing housing (200) and the first annular cover plate (206) and the second annular cover plate (208). The bearing housing (200) is locked and fixed together with the first annular cover plate (206) and the second annular cover plate (208) by four through bolts (211).

9. A bearing cooling housing for a direct-drive spindle according to claim 8, characterized in that: The first annular cover plate (206) has a first annular protrusion (207) fixedly provided on one side, and the second annular cover plate (208) has a second annular protrusion (210) provided on one side. The first annular protrusion (207) and the second annular protrusion (210) are respectively inserted into the bearing housing (200) and abut against the two end faces of the outer bearing ring (302).

10. A bearing cooling housing for a direct-drive spindle according to claim 9, characterized in that: Both sides of the upper cover box (101) and the lower cover box (102) are provided with arc-shaped notches (106). A fixing retaining ring (305) is fitted on the other side of the second annular cover plate (208). A pair of arc-shaped protrusions (209) are fixedly provided on the other side of the second annular cover plate (208). The arc-shaped protrusions (209) are slidably fitted into the arc-shaped notches (106) on the corresponding side. Three sealing oil rings (306) are fixedly provided on the inner wall of the second annular cover plate (208).

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