A machine tool bearing protection structure

Abstract

The present invention provides a machine tool bearing protection structure applied to the technical field of machine tool parts. The ball screw (1) of the machine tool bearing protection structure is located above a bearing sleeve (3) and is fixedly mounted with an oil slinger (4). The oil slinger (4) comprises an oil slinger body (5) and an oil slinger flange (6). An oil retaining ring (8) is mounted on a boss (7) on the upper inner wall of the bearing sleeve (3). The oil retaining ring (8) is mounted on the outer ring of the oil slinger body (5). The oil retaining ring (8) is located below the oil slinger flange (7). A gap is provided between the oil slinger body (5) and the oil retaining ring (8). The machine tool bearing protection structure of the present invention can effectively prevent oil stains on the ball screw from entering the supporting bearing in the bearing seat and causing bearing damage when the ball screw of the machine tool rotates. Frequent maintenance is not required, and the machine tool shutdown frequency is reduced. The structure has wide application.

Description

Technical Field

[0001] The invention belongs to the technical field of machine tool parts, and more specifically, relates to a machine tool bearing protection structure. Background Art

[0002] In the prior art, in order to prevent oil from entering the ball screw bearing and causing abnormal damage to the bearing, most machine tools install an oil-proof seal at the entrance of the bearing seat and rely on an inner lip friction seal made of rubber material to achieve oil prevention. However, when the machine tool is working, the high-speed rotating ball screw will generate heat due to friction with the oil-proof seal, resulting in a serious temperature rise, which seriously affects the transmission accuracy of the screw. At the same time, after running for a period of time, the friction surface of the oil-proof seal is prone to produce a movement gap, and oil can penetrate into the bearing through this gap under the action of gravity. In addition, the maintenance and replacement of the oil-proof seal is also very troublesome. Figure 4 The figure shows a cross-sectional structural diagram of a machine tool bearing protection structure in the prior art. In this scheme, an oil-proof seal ring is installed at the entrance of the bearing seat, and the oil-proof seal ring is fixed relative to the bearing seat. When the machine tool is working, friction occurs between the high-speed rotating ball screw and the oil-proof seal ring, which not only generates serious heat, but also makes the oil-proof seal ring easily fail, resulting in the need to frequently replace the oil-proof seal ring. Replacing the oil-proof seal ring is not only inconvenient, but also causes the machine tool to stop, affecting normal production. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in view of the deficiencies in the prior art, a bearing protection structure for machine tools is provided which has a simple structure and can effectively prevent oil stains on the ball screw from entering the supporting bearing in the bearing seat and causing bearing damage when the ball screw of the machine tool rotates, thereby increasing the service life of the bearing, eliminating the need for frequent maintenance, and reducing the frequency of machine tool shutdowns. The structure is widely applicable to machine tool bearing protection structures.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0005] The present invention is a machine tool bearing protection structure, which comprises a ball screw, a precision bearing is installed at the lower end of the ball screw, the precision bearing is installed in a bearing sleeve, the ball screw is located above the bearing sleeve and is fixed with an oil slinger ring, the oil slinger ring comprises an oil slinger ring body with a cylindrical structure and an oil slinger ring flange with an annular structure, a boss portion is arranged on the upper part of the inner wall of the bearing sleeve, an oil retaining ring is installed on the boss portion, the oil retaining ring is mounted on the outer ring of the oil slinger ring body of the oil slinger ring, the oil retaining ring is located below the oil slinger ring flange portion, a gap portion is arranged between the oil slinger ring body and the oil retaining ring, and a gap portion is arranged between the boss portion and the outer ring of the oil slinger ring body.

[0006] The oil slinger ring body and the oil slinger ring flange of the oil slinger ring are arranged as an integrated structure, and the oil slinger ring body and the oil slinger ring flange are in a T-shaped structure.

[0007] The oil slinger of the machine tool bearing protection structure is fixedly installed on the ball screw, and the inner wall of the oil slinger body of the oil slinger is provided with an installation groove I arranged around the inner wall of the oil slinger body, and the sealing ring I is clamped in the installation groove I.

[0008] The outer side of the oil retaining ring of the machine tool bearing protection structure is provided with a mounting groove II arranged around the outer side of the oil retaining ring, and the sealing ring II is clamped in the mounting groove II, and the sealing ring II is also attached to the inner wall of the bearing sleeve of the bearing sleeve.

[0009] The gap between the oil slinger ring body and the oil retaining ring of the oil slinger ring of the machine tool bearing protection structure is between 0.2mm and 0.4mm.

[0010] The gap between the boss portion of the machine tool bearing protection structure and the outer ring of the oil slinger body is between 0.2 mm and 0.4 mm.

[0011] The upper end surface of the oil slinger flange of the oil slinger is configured to be a structure that can fit on the shoulder of the ball screw, and a screw nut is also provided at the lower end of the ball screw.

[0012] When the ball screw of the machine tool bearing protection structure rotates, the oil slinger installed on the ball screw is configured to be able to rotate synchronously with the ball screw.

[0013] The oil slinger ring body and the oil slinger ring flange of the oil slinger ring are provided with an annular groove, and the upper end of the oil retaining ring is provided with a structure capable of extending into the annular groove.

[0014] The upper end of the outer side surface of the oil deflector ring is provided with a slope surface arranged along the outer side surface of the oil deflector ring, and a gap portion is provided between the ring groove surface and the slope surface.

[0015] By adopting the technical solution of the present invention, the following beneficial effects can be obtained:

[0016] The machine tool bearing protection structure described in the present invention has a vertical arrangement of the ball screw, and the structure is improved for the special working environment of the ball screw of the machine tool. An oil slinger is installed on the ball screw (screw), and an oil retainer ring is arranged on the bearing sleeve, the oil retainer ring is located below the oil slinger ring, and the oil retainer ring is fixedly connected to the bearing sleeve. When the machine tool is working, driven by the servo motor, the ball screw rotates, and the oil slinger ring fixed on the ball screw also rotates synchronously, and the dirty lubricating oil and other dirt on the ball screw flows downward, and after passing through the oil slinger ring, the oil slinger ring is thrown out due to the centrifugal inertia generated by the rotation of the ball screw, and will not flow into the interior of the precision bearing along the axial direction of the ball screw to damage the precision bearing, effectively protecting the reliability of the precision bearing (bearing). At the same time, in order to prevent the oil dirt thrown to the outside by the oil slinger ring from accumulating for a long time on the upper end surface of the bearing sleeve, and moving in the direction of the ball screw under the action of the surface tension of the liquid, an oil retainer ring is installed at the boss portion of the bearing sleeve. Since there is a gap between the oil slinger and the oil retainer ring, and there is no direct contact, when the ball screw rotates at high speed, the oil retainer ring and the bearing sleeve remain fixed and are not affected by the movement of the ball screw. Therefore, the structure of the present invention does not have contact friction between the oil slinger and the oil retainer ring, and naturally there will be no problems such as deformation and failure of the seal, and there will be no problems such as temperature rise and precision reduction of the machine tool due to intense friction heat release. In this way, it can effectively ensure that the precision bearing works for a long time, does not need to be frequently stopped for replacement, reduces costs, increases service life, and reduces the labor intensity of operators. The machine tool bearing protection structure of the present invention will not be damaged, and has good oil, dust and water resistance effects; it is easy to produce and manufacture, and has low cost. The machine tool bearing protection structure described in the present invention has a simple structure. When the ball screw of the machine tool rotates, it can effectively prevent the oil on the ball screw from entering the support bearing in the bearing seat and causing bearing damage, thereby increasing the service life of the bearing, does not require frequent maintenance, reduces the frequency of machine tool shutdown, and is widely applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following is a brief description of the contents and symbols in the drawings of this specification:

[0018] Figure 1 It is a schematic cross-sectional view of the machine tool bearing protection structure of the present invention;

[0019] Figure 2 A schematic cross-sectional view of the oil slinger of the machine tool bearing protection structure of the present invention;

[0020] Figure 3 A schematic structural diagram of the oil retaining ring of the machine tool bearing protection structure of the present invention;

[0021] Figure 4 It is a cross-sectional structural schematic diagram of a machine tool bearing protection structure in the prior art;

[0022] The marks in the attached drawings are: 1. ball screw; 2. precision bearing; 3. bearing sleeve; 4. oil slinger; 5. oil slinger body; 6. oil slinger flange; 7. boss; 8. oil retaining ring; 9. sealing ring I; 10. sealing ring II; 11. inner wall of bearing sleeve; 12. ball screw shoulder; 13. screw nut; 14. ring groove; 15. ramp surface; 16. bearing cover; 17. mounting groove I; 18. mounting groove II; 19. oil-proof sealing ring. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0024] As attached Figure 1As shown, the present invention is a machine tool bearing protection structure, which includes a ball screw 1, a precision bearing 2 is installed at the lower end of the ball screw 1, and the precision bearing 2 is installed in the bearing sleeve 3. The ball screw 1 is located above the bearing sleeve 3 and fixed with an oil slinger 4. The oil slinger 4 includes a cylindrical oil slinger body 5 and an annular oil slinger flange 6. A boss 7 is provided on the upper inner wall of the bearing sleeve 3, and an oil retaining ring 8 is installed on the boss 7. The oil retaining ring 8 is mounted on the outer ring of the oil slinger body 5 of the oil slinger 4. The oil retaining ring 8 is located below the oil slinger flange 7. A gap is provided between the oil slinger body 5 and the oil retaining ring 8, and a gap is provided between the boss 7 and the outer ring of the oil slinger body 5. In the above structure, the ball screw is arranged vertically, and the structure is improved according to the special working environment of the ball screw of the machine tool. An oil slinger is installed on the ball screw (screw), and an oil retainer is installed on the bearing sleeve. The oil retainer is located below the oil slinger and is fixedly connected to the bearing sleeve. When the machine tool is working, the ball screw rotates under the drive of the servo motor, and the oil slinger fixed on the ball screw also rotates synchronously. The dirty lubricating oil and other dirt on the ball screw flows downward, and after passing through the oil slinger, the oil slinger is thrown out due to the centrifugal inertia generated by the rotation of the ball screw. It will not flow into the interior of the precision bearing along the axial direction of the ball screw and damage the precision bearing, effectively protecting the reliability of the precision bearing (bearing). At the same time, in order to prevent the oil slinger thrown to the outside by the oil slinger from accumulating on the upper end face of the bearing sleeve for a long time, and then moving toward the direction of the ball screw under the action of the surface tension of the liquid, an oil retainer is installed at the boss of the bearing sleeve. Since there is a gap between the oil slinger and the oil retainer ring, there is no direct contact. When the ball screw rotates at high speed, the oil retainer ring and the bearing sleeve remain fixed and are not affected by the movement of the ball screw. Therefore, the structure of the present invention does not have contact friction between the oil slinger and the oil retainer ring, and naturally there will be no problems such as deformation and failure of the seal, and there will be no problems such as temperature rise and precision reduction of the machine tool due to intense friction heat release. In this way, it can effectively ensure that the precision bearing works for a long time, does not need to be frequently stopped for replacement, reduces costs, increases service life, and reduces the labor intensity of operators. The machine tool bearing protection structure of the present invention will not be damaged, and has good protection effects such as oil, dust, and water; it is easy to produce and manufacture, has low cost, and is suitable for wide application. The machine tool bearing protection structure described in the present invention has a simple structure. When the ball screw of the machine tool rotates, it can effectively prevent the oil on the ball screw from entering the support bearing in the bearing seat and causing bearing damage, thereby increasing the service life of the bearing, does not require frequent maintenance, reduces the frequency of machine tool shutdown, and is widely applicable.

[0025] In the machine tool of the present invention, the ball screw is connected to the bearing sleeve through a precision bearing, the ball screw is arranged vertically, and can rotate relative to the bearing sleeve under the electric drive of the servo motor. The oil slinger body 5 and the oil slinger flange 6 of the oil slinger 4 are umbrella-shaped as a whole, and the oil slinger covers the oil retaining ring and the bearing sleeve, effectively isolating dirty lubricating oil and other contaminants from entering the bearing sleeve.

[0026] The oil slinger ring body 5 and the oil slinger ring flange 6 of the oil slinger ring 4 are arranged as an integrated structure, and the oil slinger ring body 5 and the oil slinger ring flange 6 are in a T-shaped structure. The above structure, the integrated structure of the oil slinger ring, is made of the material for making a sealing ring. The existence of the oil slinger ring flange, on the one hand, is used to contact with the shoulder of the ball screw to increase the contact area, improve the fixing performance of the oil slinger ring relative to the ball screw, and ensure that the oil slinger ring always rotates synchronously with the ball screw. The existence of the oil slinger ring flange, on the other hand, plays a role in shielding dirty lubricating oil and other contaminants from the upper part, so that the dirty lubricating oil and other contaminants are efficiently and cleanly thrown out when the oil slinger ring rotates.

[0027] The oil slinger 4 of the machine tool bearing protection structure is fixedly mounted on the ball screw 1, and the inner wall of the oil slinger body 5 of the oil slinger 4 is provided with a mounting groove I arranged along the inner wall of the oil slinger body 5, and the sealing ring I 9 is clamped in the mounting groove I. The above structure and the setting of the sealing ring I 9 realize the sealing between the oil slinger and the ball screw to prevent the entry of dirt, and at the same time, effectively play a role of dustproof and waterproof, and avoid the entry of foreign objects that affect the reliability of the bearing.

[0028] The outer side of the oil retaining ring 8 of the machine tool bearing protection structure is provided with a mounting groove II arranged along the outer side of the oil retaining ring 8, and a sealing ring II 10 is clamped in the mounting groove II, and the sealing ring II 10 is simultaneously attached to the inner wall 11 of the bearing sleeve 3. The above structure, through the setting of the sealing ring II 10, realizes the sealing between the oil retaining ring and the bearing sleeve to prevent the entry of dirt, and at the same time, effectively plays a role of dustproof and waterproof, and avoids the entry of foreign objects that affect the reliability of the bearing.

[0029] The gap between the oil slinger body 5 and the oil retainer ring 8 of the oil slinger ring 4 of the machine tool bearing protection structure is between 0.2mm and 0.4mm. In the above structure, the setting of the size of the gap ensures that the oil slinger ring and the oil retainer ring do not directly contact each other, thus avoiding friction between the two and damaging the oil slinger ring.

[0030] The clearance between the boss 7 of the machine tool bearing protection structure and the outer ring of the oil slinger body 5 is between 0.2mm and 0.4mm. The above structure and the setting of the clearance size prevent the oil slinger and the boss from directly contacting each other, thus avoiding friction between the two and damaging the oil slinger.

[0031] The upper end surface of the oil slinger flange portion 6 of the oil slinger 4 is configured to fit on the ball screw shaft shoulder 12, and a screw nut 13 is also provided at the lower end of the ball screw 1. In the above structure, the upper end surface of the oil slinger is tightly pressed against the ball screw shaft shoulder, so that the oil slinger cannot move axially along the ball screw, and the lower end surface of the oil slinger is contacted and limited with the boss portion, so that reliable installation is achieved.

[0032] When the ball screw 1 of the machine tool bearing protection structure rotates, the oil slinger 4 installed on the ball screw 1 is configured to be able to rotate synchronously with the ball screw 1 .

[0033] The oil slinger ring 4 has an annular groove 14 at the joint of the oil slinger ring body 5 and the oil slinger ring flange 6, and the upper end of the oil retaining ring 8 is configured to extend into the annular groove 14. The upper end of the outer side surface of the oil retaining ring 8 is configured to have an inclined surface 15 arranged along the outer side surface of the oil retaining ring 8, and a gap is configured between the surface of the annular groove 14 and the inclined surface 15. In the above structure, the lower end surface of the oil slinger ring and the oil retaining ring have a partial overlap in the axial direction, and the annular groove and the oil retaining ring do not contact each other. In this way, even if a small amount of dirty lubricating oil and other impurities flow downward along the oil slinger ring, it will not reach the oil retaining ring. Even if it reaches the oil retaining ring, it will remain along the inclined surface and will not enter the bearing sleeve. The annular groove and the inclined surface are configured to have a gap, and the two will not contact each other, so that when the ball screw rotates, the rotating oil slinger ring and the fixed oil retaining ring will not contact each other, and there will be no friction problem.

[0034] The machine tool bearing protection structure described in the present invention has a vertical arrangement of the ball screw, and the structure is improved for the special working environment of the ball screw of the machine tool. An oil slinger is installed on the ball screw (screw), and an oil retainer ring is arranged on the bearing sleeve, the oil retainer ring is located below the oil slinger ring, and the oil retainer ring is fixedly connected to the bearing sleeve. When the machine tool is working, driven by the servo motor, the ball screw rotates, and the oil slinger ring fixed on the ball screw also rotates synchronously, and the dirty lubricating oil and other dirt on the ball screw flows downward, and after passing through the oil slinger ring, the oil slinger ring is thrown out due to the centrifugal inertia generated by the rotation of the ball screw, and will not flow into the interior of the precision bearing along the axial direction of the ball screw to damage the precision bearing, effectively protecting the reliability of the precision bearing (bearing). At the same time, in order to prevent the oil dirt thrown to the outside by the oil slinger ring from accumulating for a long time on the upper end surface of the bearing sleeve, and moving in the direction of the ball screw under the action of the surface tension of the liquid, an oil retainer ring is installed at the boss portion of the bearing sleeve. Since there is a gap between the oil slinger and the oil retainer ring, and there is no direct contact, when the ball screw rotates at high speed, the oil retainer ring and the bearing sleeve remain fixed and are not affected by the movement of the ball screw. Therefore, the structure of the present invention does not have contact friction between the oil slinger and the oil retainer ring, and naturally there will be no problems such as deformation and failure of the seal, and there will be no problems such as temperature rise and precision reduction of the machine tool due to intense friction heat release. In this way, it can effectively ensure that the precision bearing works for a long time, does not need to be frequently stopped for replacement, reduces costs, increases service life, and reduces the labor intensity of operators. The machine tool bearing protection structure of the present invention will not be damaged, and has good oil, dust and water resistance effects; it is easy to produce and manufacture, and has low cost. The machine tool bearing protection structure described in the present invention has a simple structure. When the ball screw of the machine tool rotates, it can effectively prevent the oil on the ball screw from entering the support bearing in the bearing seat and causing bearing damage, thereby increasing the service life of the bearing, does not require frequent maintenance, reduces the frequency of machine tool shutdown, and is widely applicable.

[0035] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A machine tool bearing protection structure, characterized in that: The machine tool bearing protection structure comprises a ball screw (1), a precision bearing (2) is installed at the lower end of the ball screw (1), the precision bearing (2) is installed in the bearing sleeve (3), the ball screw (1) is located above the bearing sleeve (3) and is fixed with an oil slinger (4), the oil slinger (4) comprises an oil slinger body (5) of a cylindrical structure and an oil slinger flange (6) of an annular structure, a boss portion (7) is provided at the upper part of the inner wall of the bearing sleeve (3), an oil slinger (8) is installed on the boss portion (7), the oil slinger (8) is located below the oil slinger flange (6), a gap portion is provided between the oil slinger body (5) and the oil slinger (8), and a gap portion is provided between the boss portion (7) and the outer ring of the oil slinger body (5); When the ball screw (1) of the machine tool bearing protection structure rotates, the oil slinger (4) installed on the ball screw (1) is configured to be able to rotate synchronously with the ball screw (1); The oil slinger ring (4) has an annular groove (14) disposed at the joint between the oil slinger ring body (5) and the oil slinger ring flange (6), and the upper end of the oil retaining ring (8) is configured to extend into the annular groove (14); The upper end of the outer surface of the oil deflector ring (8) is provided with a slope surface (15) arranged along the outer side surface of the oil deflector ring (8), and a gap portion is provided between the surface of the annular groove (14) and the slope surface (15); The oil slinger ring body (5) and the oil slinger ring flange (6) of the oil slinger ring (4) are umbrella-shaped.

2. The machine tool bearing protection structure according to claim 1, characterized in that: The oil slinger ring body (5) and the oil slinger ring flange (6) of the oil slinger ring (4) are arranged as an integrated structure, and the oil slinger ring body (5) and the oil slinger ring flange (6) are in a T-shaped structure.

3. The machine tool bearing protection structure according to claim 1 or 2, characterized in that: The oil slinger (4) of the machine tool bearing protection structure is fixedly mounted on the ball screw (1), and the inner wall of the oil slinger body (5) of the oil slinger (4) is provided with a mounting groove I arranged along the inner wall of the oil slinger body (5), and a sealing ring I (9) is clamped in the mounting groove I.

4. The machine tool bearing protection structure according to claim 1 or 2, characterized in that: The outer side surface of the oil retaining ring (8) of the machine tool bearing protection structure is provided with a mounting groove II arranged along the outer side surface of the oil retaining ring (8), and a sealing ring II (10) is clamped in the mounting groove II, and the sealing ring II (10) is simultaneously attached to the inner wall (11) of the bearing sleeve (3).

5. The machine tool bearing protection structure according to claim 1 or 2, characterized in that: The clearance between the oil slinger ring body (5) and the oil retainer ring (8) of the oil slinger ring (4) of the machine tool bearing protection structure is between 0.2 mm and 0.4 mm.

6. The machine tool bearing protection structure according to claim 1 or 2, characterized in that: The clearance between the boss portion (7) of the machine tool bearing protection structure and the outer ring of the oil slinger body (5) is between 0.2 mm and 0.4 mm.

7. The machine tool bearing protection structure according to claim 1 or 2, characterized in that: The upper end surface of the oil slinger flange portion (6) of the oil slinger (4) is configured as a structure capable of fitting onto a ball screw shaft shoulder (12), and a screw nut (13) is also provided at the lower end of the ball screw (1).

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