Inner ring cooling mechanism for ball screw supporting bearing

Abstract

The utility model relates to the technical field of numerical control machine tools, and discloses a ball screw supporting bearing inner ring cooling mechanism, which is mounted between a bearing and a ball screw, is used for cooling a bearing inner ring, and specifically comprises a cooling sleeve, and a cooling groove, a liquid supply runner, a liquid injection hole, a liquid discharge hole and an injection hole are formed in the cooling sleeve; the cooling sleeve is arranged on the periphery of an optical shaft of the ball screw in a sleeving mode, and the cooling sleeve and an inner ring of the bearing are tightly assembled. The cooling groove is formed in the inner wall of the cooling sleeve, and the liquid supply runner is arranged on the outer side of the cooling groove. Heat of the inner ring of the bearing is taken away through the cooling liquid, then the inner ring of the bearing is cooled, the cooling liquid finally flows back to the cooling liquid supply equipment through the liquid discharge hole, circulating liquid cooling of the inner ring of the bearing is achieved, temperature rise of a driving system is reduced, and coordinate axis transmission precision of a machine tool is improved.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, specifically to a ball screw support bearing inner ring cooling mechanism. Background Technology

[0002] CNC machine tools are widely used processing equipment in the market, and ball screw drives are a common structural form for driving the coordinate axes of machine tools. With the increasing demands for machining accuracy, research on various factors affecting machine tool accuracy is becoming more in-depth. Among these, the thermal elongation of the machine tool coordinate axis drive system is a significant factor affecting machine tool accuracy and has become an important research topic.

[0003] Currently, there are several ways to solve or control the heat generation in coordinate axis drive systems. Generally, these include heat generation from the drive motor, heat generation from the ball screw nut, and heat generation from the support bearing. When the bearing rotates and generates heat, the inner ring dissipates heat more slowly because it is inside the overall structure. Under normal circumstances, the temperature of the inner ring is higher than that of the outer ring. Therefore, it is necessary to design a cooling mechanism for the inner ring of the ball screw support bearing to control the temperature of the inner ring in order to solve the bearing heat generation problem. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a ball screw support bearing inner ring cooling mechanism.

[0005] This utility model proposes a ball screw support bearing inner ring cooling mechanism, which is installed between the bearing and the ball screw for cooling the inner ring of the bearing. Specifically, it includes a cooling sleeve, and the interior of the cooling sleeve is provided with a cooling groove, a liquid supply channel, a liquid injection hole, a liquid drain hole, and an injection hole.

[0006] The cooling sleeve is fitted onto the outer periphery of the ball screw shaft, and the cooling sleeve is tightly assembled with the inner ring of the bearing.

[0007] The cooling tank is formed on the inner wall of the cooling sleeve, and the liquid supply channel is located on the outer side of the cooling tank.

[0008] The outlet of the liquid supply channel is connected to the inlet of the cooling tank through an injection hole, and the inlet of the liquid supply channel is connected to the outlet of the coolant supply equipment through an injection hole.

[0009] The outlet of the cooling tank is connected to the return port of the coolant supply equipment through a drain hole.

[0010] As a further optimization of this utility model, the cooling tank is a spiral groove, and the coolant in the cooling tank is in direct contact with the outer surface of the ball screw.

[0011] As a further optimization of this utility model, the spiral axis of the cooling groove coincides with the axis of the cooling sleeve.

[0012] As a further optimization of this utility model, both ends of the cooling sleeve are sealed to the outer surface of the optical shaft end of the ball screw through a second sealing ring.

[0013] As a further optimization of this utility model, one end of the cooling sleeve is in close contact with the shoulder of the ball screw, and the other end of the cooling sleeve is connected to the inner ring end face of the bearing through fasteners.

[0014] As a further optimization of this utility model, the cooling mechanism also includes a cooling liquid delivery block. The cooling liquid delivery block is installed on the end face of the motor base away from the motor and is fitted onto the outside of the cooling sleeve. The interior of the cooling liquid delivery block has two independent guide channels. One guide channel is used to connect the drain hole with the return port of the coolant supply device, and the other guide channel is used to connect the injection hole with the outlet of the coolant supply device.

[0015] As a further optimization of this utility model, a first sealing ring is installed in the inner hole of the cooling liquid delivery block, and the axis of the first sealing ring coincides with the axis of the cooling sleeve. The cooling liquid delivery block is sealed to the outer wall of the cooling sleeve through the first sealing ring. The number of the first sealing rings is three and they are evenly distributed along the axis of the inner hole of the cooling liquid delivery block to form two guide grooves.

[0016] As a further optimization of this utility model, the guide groove includes a first part and a second part. The first part is an annular groove disposed on the outer periphery of the cooling sleeve for communicating with the drain hole or injection hole. The second part is a guide channel opened inside the cooling liquid delivery block. One end of the guide channel is connected to the annular groove, and the other end of the guide channel is connected to the outlet or return port of the coolant supply device.

[0017] The ball screw support bearing inner ring cooling mechanism proposed in this utility model has the following beneficial effects:

[0018] This invention features a cooling tank, a liquid supply channel, a liquid injection hole, a liquid drain hole, and an injection hole inside the cooling sleeve. The liquid drain hole and the injection hole are connected to the return port and outlet port of the coolant supply equipment, respectively. The coolant is supplied through the coolant supply equipment and enters the cooling tank sequentially through the injection hole, the liquid supply channel, and the liquid injection hole. The coolant in the cooling tank directly acts on the outer surface of the ball screw, thereby absorbing the heat on the ball screw. At the same time, the cooling sleeve conducts the heat of the bearing inner ring to the coolant inside, and the coolant carries away the heat of the bearing inner ring, thus cooling the bearing inner ring. Finally, the coolant flows back to the coolant supply equipment through the liquid drain hole, realizing circulating liquid cooling of the bearing inner ring, thereby reducing the temperature rise of the drive system and improving the coordinate axis transmission accuracy of the machine tool.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a frontal cross-sectional structural diagram of the inner ring cooling mechanism provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the assembly structure of the inner ring cooling mechanism and the ball screw provided by this utility model.

[0022] Figure descriptions: 1. Motor; 2. Motor base; 3. Bearing; 4. Ball screw; 5. Coupling; 6. Cooling sleeve; 7. Cooling tank; 8. Liquid supply channel; 9. Injection hole; 10. Drain hole; 11. Injection hole; 12. Cooling liquid delivery block; 13. First sealing ring; 14. First guide groove; 15. Second guide groove; 16. Injection pipe; 17. Drain pipe; 18. Locking nut; 19. First plug; 20. Second plug; 21. Second sealing ring; 22. Adjusting washer. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] Please see Figure 1 and Figure 2A ball screw support bearing inner ring cooling mechanism is installed between bearing 3 and ball screw 4. Motor base 2 is installed at one end of motor 1. The optical shaft end of ball screw 4 extends into the interior of motor base 2 and is connected to the output shaft of motor 1 through coupling 5. Bearing 3 is installed inside motor base 2 and fitted outside the support bearing inner ring cooling mechanism. The support bearing inner ring cooling mechanism cools down the inner ring of bearing 3.

[0029] Specifically, such as Figure 1 As shown, the inner ring cooling mechanism of the support bearing includes a cooling sleeve 6, and the interior of the cooling sleeve 6 is provided with a cooling groove 7, a liquid supply channel 8, a liquid injection hole 9, a liquid discharge hole 10, and an injection hole 11.

[0030] The cooling sleeve 6 is fitted onto the outer circumference of the optical shaft of the ball screw 4, and the cooling sleeve 6 is tightly assembled with the inner ring of the bearing 3. When the motor 1 drives the ball screw 4 to rotate through the coupling 5, the optical shaft end of the ball screw 4 drives the cooling sleeve 6 and the inner ring of the bearing 3 to rotate synchronously.

[0031] The cooling tank 7 is located on the inner wall of the cooling sleeve 6, and the liquid supply channel 8 is located on the outer side of the cooling tank 7.

[0032] The outlet of the liquid supply channel 8 is connected to the inlet of the cooling tank 7 through the injection hole 9, and the inlet of the liquid supply channel 8 is connected to the outlet of the coolant supply equipment through the injection hole 11.

[0033] The outlet of the cooling tank 7 is connected to the return port of the coolant supply equipment through the drain hole 10;

[0034] During operation, motor 1 drives ball screw 4 to rotate through coupling 5. The heat generated by motor 1 is transferred to ball screw 4. The inner ring of bearing 3 generates heat as it rotates. At this time, the coolant supply device injects coolant into the supply channel 8 through injection hole 11. The coolant in the supply channel 8 is injected into the cooling tank 7 through injection hole 9. The coolant in the cooling tank 7 cools the surface of ball screw 4. The heat generated by the rotation of the inner ring of bearing 3 is conducted to the cooling sleeve 6. The coolant in the cooling sleeve 6 absorbs and exchanges heat with the cooling sleeve 6. The coolant after heat exchange flows back to the coolant supply device through drain hole 10, realizing the circulating liquid cooling of the inner ring of bearing 3.

[0035] It should be noted that, under the manufacturing process of the cooling sleeve 6, both the injection hole 9 and the liquid supply channel 8 have an opening located on the outer wall of the cooling sleeve 6. During the assembly process, the two openings are sealed by the first plug 19 and the second plug 20 respectively to prevent the leakage of coolant.

[0036] Specifically, such as Figure 1As shown, the cooling tank 7 is a spiral groove, and the spiral axis of the cooling tank 7 coincides with the axis of the cooling sleeve 6. The coolant in the cooling tank 7 is in direct contact with the outer surface of the ball screw 4. The spiral design of the cooling tank 7 can increase the residence time of the coolant in the cooling sleeve 6, thereby extending the cooling time of the coolant on the surface of the ball screw 4, thus improving the actual heat exchange cooling effect and facilitating the temperature control of the inner ring of the bearing 3.

[0037] Specifically, such as Figure 1 As shown, annular sealing grooves are provided on the inner walls of both ends of the cooling sleeve 6, and a second sealing ring 21 is installed in the annular sealing groove. The second sealing ring 21 is aligned with the axis of the cooling sleeve 6, and the inner wall of the second sealing ring 21 is tightly fitted with the outer wall of the ball screw 4. Both ends of the cooling sleeve 6 are sealed to the outer surface of the optical shaft end of the ball screw 4 through the second sealing ring 21. The second sealing ring 21 is an O-ring, and two second sealing rings 21 are provided at both ends of the cooling sleeve 6 to ensure the reliability of the seal and prevent coolant from leaking from both ends.

[0038] Specifically, one end of the cooling sleeve 6 is in close contact with the shoulder of the ball screw 4, and the other end of the cooling sleeve 6 is connected to the inner ring end face of the bearing 3 by fasteners.

[0039] Furthermore, such as Figure 1 As shown, the fasteners include a locking nut 18 and an adjusting washer 22. The outer surface of the end of the ball screw 4 near the coupling 5 has external threads. The locking nut 18 is threadedly fitted onto the end of the ball screw 4 near the coupling 5. The adjusting washer 22 is slidably fitted onto the ball screw 4 and located between the locking nut 18 and the cooling sleeve 6. By tightening the locking nut 18, the locking nut 18 moves towards the cooling sleeve 6 until the locking nut 18 presses the adjusting washer 22 against the inner ring of the bearing 3 and the end face of the cooling sleeve 6. This tightly assembles the cooling sleeve 6 with the inner ring of the bearing 3 and the optical shaft end of the ball screw 4, so that the motor 1 drives the coupling 5 to drive the ball screw 4, the cooling sleeve 6, and the inner ring of the bearing 3 to rotate synchronously.

[0040] Specifically, such as Figure 1 As shown, the cooling mechanism also includes a cooling liquid delivery block 12. The cooling liquid delivery block 12 is installed on the side of the motor base 2 away from the motor 1 and is fitted onto the outside of the cooling sleeve 6. The interior of the cooling liquid delivery block 12 has two independent guide channels. One guide channel is used to connect the drain hole 10 with the return port of the coolant supply device, and the other guide channel is used to connect the injection hole 11 with the outlet of the coolant supply device, so as to facilitate the injection and discharge of coolant and thus facilitate circulating liquid cooling.

[0041] Furthermore, a first sealing ring 13 is installed in the inner hole of the cooling liquid delivery block 12, and the axis of the first sealing ring 13 coincides with the axis of the cooling sleeve 6. The cooling liquid delivery block 12 is sealed to the outer wall of the cooling sleeve 6 through the first sealing ring 13. There are three first sealing rings 13, which are evenly distributed along the axis of the inner hole of the cooling liquid delivery block 12 to form two guide grooves.

[0042] Furthermore, the guide channel includes a first part and a second part. The first part is an annular groove provided on the outer periphery of the cooling sleeve 6 for communicating with the drain hole 10 or the injection hole 11. The second part is a guide channel opened inside the cooling liquid block 12. One end of the guide channel is connected to the annular groove, and the other end of the guide channel is connected to the outlet or return port of the coolant supply device.

[0043] The annular groove design ensures that when the ball screw 4 drives the cooling sleeve 6 to rotate, the injection hole 11 and the drain hole 10 on the outer surface of the cooling sleeve 6 are always connected to the adjacent guide groove, so as to continuously inject and discharge the coolant, thereby achieving stable circulating liquid cooling of the inner ring of the bearing 3.

[0044] Furthermore, such as Figure 1 As shown, the two guide channels are the first guide channel 14 and the second guide channel 15, respectively. The first guide channel 14 is connected to the outlet of the coolant supply device, and the second guide channel 15 is connected to the return port of the coolant supply device.

[0045] Furthermore, the annular groove portion of the first guide groove 14 is connected to the injection hole 11, and the guide channel portion of the first guide groove 14 is connected to the outlet of the coolant supply device through the injection pipe 16. The annular groove portion of the second guide groove 15 is connected to the drain hole 10, and the guide channel portion of the second guide groove 15 is connected to the return port of the coolant supply device through the drain pipe 17.

[0046] In summary, the ball screw support bearing inner ring cooling mechanism proposed in this utility model has a cooling tank 7, a liquid supply channel 8, a liquid injection hole 9, a liquid drain hole 10, and an injection hole 11 inside the cooling sleeve 6. The liquid drain hole 10 and the injection hole 11 are respectively connected to the return port and the outlet port of the coolant supply equipment. The coolant is supplied by the coolant supply equipment and enters the cooling tank 7 through the injection hole 11, the liquid supply channel 8, and the liquid injection hole 9. The coolant in the cooling tank 7 directly acts on the outer surface of the ball screw 4, thereby absorbing the heat on the ball screw 4. At the same time, the cooling sleeve 6 conducts the heat of the inner ring of the bearing 3 to the coolant inside it. The coolant carries away the heat of the inner ring of the bearing 3, thereby cooling and reducing the temperature of the inner ring of the bearing 3. Finally, the coolant flows back to the coolant supply equipment through the liquid drain hole 10, realizing the circulating liquid cooling of the inner ring of the bearing 3, thereby reducing the temperature rise of the drive system and improving the coordinate axis transmission accuracy of the machine tool.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A ball screw support bearing inner ring cooling mechanism, installed between the bearing (3) and the ball screw (4), characterized in that, It includes a cooling sleeve (6), and the interior of the cooling sleeve (6) is provided with a cooling groove (7), a liquid supply channel (8), a liquid injection hole (9), a liquid discharge hole (10), and an injection hole (11); The cooling sleeve (6) is fitted onto the outer periphery of the optical shaft of the ball screw (4), and the cooling sleeve (6) is tightly assembled with the inner ring of the bearing (3); The cooling tank (7) is formed on the inner wall of the cooling sleeve (6), and the liquid supply channel (8) is set on the outer side of the cooling tank (7); The outlet of the liquid supply channel (8) is connected to the inlet of the cooling tank (7) through the injection hole (9), and the inlet of the liquid supply channel (8) is connected to the outlet of the coolant supply device through the injection hole (11). The outlet of the cooling tank (7) is connected to the return port of the cooling liquid supply equipment through the drain hole (10).

2. The ball screw support bearing inner ring cooling mechanism according to claim 1, characterized in that, The cooling tank (7) is a spiral groove, and the coolant in the cooling tank (7) is in direct contact with the outer surface of the ball screw (4).

3. The ball screw support bearing inner ring cooling mechanism according to claim 2, characterized in that, The spiral axis of the cooling tank (7) coincides with the axis of the cooling sleeve (6).

4. The ball screw support bearing inner ring cooling mechanism according to claim 1, characterized in that, Both ends of the cooling sleeve (6) are sealed to the outer surface of the optical axis of the ball screw (4) through the second sealing ring (21).

5. The ball screw support bearing inner ring cooling mechanism according to claim 1, characterized in that, One end of the cooling sleeve (6) is in close contact with the shoulder of the ball screw (4), and the other end of the cooling sleeve (6) is connected to the inner ring end face of the bearing (3) by fasteners.

6. The ball screw support bearing inner ring cooling mechanism according to claim 1, characterized in that, It also includes a cooling liquid delivery block (12), which is installed on the side of the motor base (2) away from the motor (1) and fitted on the outside of the cooling sleeve (6). The cooling liquid delivery block (12) has two independent guide channels inside. One guide channel is used to connect the drain hole (10) with the return port of the coolant supply device, and the other guide channel is used to connect the injection hole (11) with the outlet of the coolant supply device.

7. A ball screw support bearing inner ring cooling mechanism according to claim 6, characterized in that, A first sealing ring (13) is installed in the inner hole of the cooling liquid delivery block (12), and the axis of the first sealing ring (13) coincides with the axis of the cooling sleeve (6). The cooling liquid delivery block (12) is sealed to the outer wall of the cooling sleeve (6) through the first sealing ring (13). There are three first sealing rings (13) and they are evenly distributed along the axis of the inner hole of the cooling liquid delivery block (12) to form two guide grooves.

8. A ball screw support bearing inner ring cooling mechanism according to claim 6, characterized in that, The guide channel includes a first part and a second part. The first part is an annular groove set on the outer periphery of the cooling sleeve (6) for communicating with the drain hole (10) or the injection hole (11). The second part is a guide channel opened inside the cooling liquid delivery block (12). One end of the guide channel is connected to the annular groove, and the other end of the guide channel is connected to the outlet or return port of the coolant supply device.

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