Centrifugal automatic greasing device for bearing with outer ring and rolling pin

Abstract

The application is a centrifugal automatic greasing device for a roller bearing with an outer ring, comprising: a greasing head, which is inserted into the roller bearing and has an oil outlet hole; a chuck, which is used for clamping and fixing the outer ring of the roller bearing; a rotary driving assembly, which drives the chuck to rotate and drives the rollers in the roller bearing to make circumferential revolution, and the rollers realize self-rotation through rolling with the greasing head; the rotation speed of the chuck is not less than 10000r / min, and the centrifugal force generated by the rotation drives the grease to the inner wall of the roller bearing, and the grease spreads along the axial sides of the roller bearing after touching the inner wall. Through the centrifugal force generated by high-speed rotation, the grease is actively and quickly thrown into the internal gap of the roller bearing, overcoming the slow greasing problem caused by high viscosity of the grease in the traditional pressure infiltration method; at the same time, the grease uniformly spreads along the inner wall under the centrifugal force, so that the grease is more fully and uniformly filled in the roller bearing.

Description

Technical Field

[0001] This invention relates to the field of clutch bearing grease technology, specifically a centrifugal automatic grease applicator for needle roller bearings with an outer ring. Background Technology

[0002] Before use, needle roller bearings with outer rings require the addition of grease. To improve the automation level of the grease injection process, several automated grease injection solutions have been proposed in the prior art. For example, Chinese patent document CN100557292C discloses a bearing grease injection and equalization system. This system mainly consists of two parts: a sleeve and a clamp. The sleeve is inserted into and fixedly connected to the inner ring of the bearing, while the clamp is used to fix the outer ring of the bearing. During grease injection, the grease is injected through the channel inside the sleeve and sprayed out from the orifice on the side wall of the sleeve into the internal clearance of the needle roller bearing; simultaneously, the outer ring of the bearing is driven to rotate, completing the grease injection.

[0003] The above setup has the following drawbacks: 1. The grease is passively forced into the bearing solely by the limited pressure provided by the system. Due to the high viscosity and poor fluidity of the grease itself, the injection speed is slow due to relying solely on pressure penetration. 2. To prevent grease leakage from both ends of the bearing during the injection process, additional sealing structures must be installed at both ends of the bearing, which increases the complexity of the system and the assembly steps.

[0004] Therefore, the above structure has problems such as low grease injection efficiency, uneven filling, and reliance on external seals when filling needle roller bearings with outer rings with lubricating grease. Summary of the Invention

[0005] To address the technical problems in the background art, this invention discloses a centrifugal automatic grease-adding device for needle roller bearings with outer rings.

[0006] This invention provides a centrifugal automatic grease filling device for needle roller bearings with outer rings, comprising: A grease filling head is inserted into the needle roller bearing, and an oil outlet hole is opened on the grease filling head. A certain amount of grease flows out through the oil outlet hole and is injected into the needle roller bearing. On the radial projection surface of the needle roller bearing, the projection area of ​​the needle rollers inside the needle roller bearing covers the oil outlet hole. A chuck is used to clamp and fix the outer ring of a needle roller bearing. The rotary drive assembly drives the chuck to rotate, causing the needle rollers inside the needle roller bearing to revolve in a circular motion. At the same time, the needle rollers rotate on their own by rolling with the grease applicator. The rotation speed of the chuck is not less than 10,000 r / min. The centrifugal force generated by the rotation drives the grease to be thrown towards the inner wall of the needle roller bearing. After the grease touches the inner wall, it spreads along both sides of the needle roller bearing axis.

[0007] Furthermore, a rotating shaft is provided, and the chuck is inserted into a guide hole inside the rotating shaft; On the rotating shaft, on both sides of the axial direction corresponding to the chuck, there are a first limiting step and a second limiting step, respectively; The first limiting step and the second limiting step are set opposite to each other, and the distance between them forms the limiting range for the axial movement of the clamp.

[0008] Furthermore, the rotating shaft consists of a shaft body and a shaft end; The first limiting step is located on the shaft head, and the second limiting step is located on the shaft body.

[0009] Furthermore, it also includes fixed supports; The support has a first locking platform and a second locking platform facing opposite directions at its two axial ends; The first chuck is equipped with a first rolling bearing, and the second chuck is equipped with a second rolling bearing. The shaft is simultaneously rotatably connected to the first rolling bearing and the second rolling bearing, with the shaft head pressing against the inner ring end face of the first rolling bearing; A lock nut is also threaded onto the shaft, and the lock nut presses against the inner ring end face of the second rolling bearing.

[0010] Furthermore, the clamp and the pull rod are coaxially and fixedly connected; The pull rod is driven by a telescopic cylinder to achieve axial extension and retraction, which in turn drives the chuck to complete the clamping or loosening of the needle roller bearing.

[0011] Furthermore, a bearing housing is fixedly installed on the drive end of the telescopic cylinder; The bearing housing is equipped with a third rolling bearing. One end of the pull rod is inserted into the inner ring of the third rolling bearing, so that when the pull rod rotates with the shaft, the piston rod of the telescopic cylinder remains in a fixed position.

[0012] Furthermore, the inner wall of the bearing housing is provided with radially protruding retaining rings, and the third rolling bearings are respectively engaged with the retaining rings on both axial sides; A retaining ring is provided on the inner ring end face of the third rolling bearing near the telescopic cylinder. The locking bolt passes through the retaining ring and is threadedly connected to the tie rod to achieve axial limiting constraint of the third rolling bearing on this side. The tie rod is also threaded with a limit nut, which abuts against the outer end face of the inner ring of the third rolling bearing on the other side, thus completing the axial locking constraint of the third rolling bearing on that side.

[0013] Furthermore, the rotary drive assembly includes a motor, and the output drive end of the motor is fixedly provided with a drive gear; A driven gear is fixedly mounted on the rotating shaft, and the driven gear meshes with the driving gear for transmission. The number of teeth on the driving gear is greater than the number of teeth on the driven gear.

[0014] The beneficial effects of this invention are: 1. Through the centrifugal force generated by high-speed rotation, the grease is actively and quickly thrown into the internal gap of the needle roller bearing, overcoming the problem of slow grease injection caused by the high viscosity of grease in the traditional pressure penetration method; at the same time, the grease diffuses evenly along the inner wall under centrifugal action, so that the grease fills the inside of the needle roller bearing more fully and evenly.

[0015] 2. Centrifugal force drives the grease to diffuse axially to both sides of the needle roller, effectively avoiding the problem of grease leakage from both ends of the bearing. Therefore, the present invention does not require additional end sealing structures, reducing the complexity of the device and assembly costs.

[0016] 3. The high-speed setting ensures that the centrifugal force is sufficient to overcome the resistance to grease flow. The centrifugal force throws the grease toward the inner wall of the needle roller bearing, while the rotation of the needle rollers also carries the adhering grease into the inner side of the needle roller bearing. Therefore, under the combined action of the revolution and rotation of the needle rollers, the grease is fully penetrated and distributed inside the needle roller bearing, thereby improving the efficiency and quality of grease application. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a front sectional view of the present invention, wherein the grease applicator is inserted into the needle roller bearing; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 yes Figure 1 Enlarged view of point B in the middle; Figure 4 This is a front sectional view of the present invention, wherein the grease filling head is located directly above the needle roller bearing; In the diagram: 1. Grease head; 2. Needle roller bearing; 3. Chuck; 4. Shaft; 5. Support; 6. First rolling bearing; 7. Second rolling bearing; 8. Locking nut; 9. Tie rod; 10. Telescopic cylinder; 11. Bearing housing; 12. Third rolling bearing; 13. Retaining ring; 14. Locking bolt; 15. Limit nut; 16. Motor; 17. Drive gear; 18. Driven gear; 19. Worktable; 20. Connector; 21. Motor housing; 22. Guide post; 23. Top plate; 24. Lifting plate; 25. Guide sleeve; 26. Lifting cylinder; 27. Connector; 101. Oil outlet; 201. Needle roller; 111. Snap ring; 401. Guide hole; 402. First limit step; 403. Second limit step; 404. Shaft body; 405. Shaft head; 501. First clamping platform; 502. Second clamping platform. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0020] like Figure 1 and Figure 4 As shown, this invention discloses a centrifugal automatic grease-adding device for needle roller bearings with outer rings, used for automatically adding lubricating grease to needle roller bearings with outer rings. It includes a horizontal worktable 19, on which an axially vertically extending support 5 is mounted. A radially protruding annular mounting plate is provided at the center of the outer wall of the support 5, and the mounting plate is fixedly connected to the worktable 19 by bolts. The area of ​​the support 5 located below the mounting plate extends downwards into the worktable 19, achieving positioning of the support 5.

[0021] like Figure 2 As shown, a first retaining platform 501 and a second retaining platform 502 are respectively provided at the upper and lower ends of the inner wall of the support 5. A first rolling bearing 6 is installed in the first retaining platform 501, and a second rolling bearing 7 is installed in the second retaining platform 502. The upper end of the rotating shaft 4 is inserted into the first rolling bearing 6 and the second rolling bearing 7 to achieve a rotatable connection.

[0022] The chuck 3, used to clamp and fix the needle roller bearing 2, is inserted into the guide hole 401 in the upper inner area of ​​the rotating shaft 4, and is used for guiding the lifting and lowering of the chuck 3. The upper end of the rotating shaft 4 is provided with a conical guide surface that is narrower at the top and wider at the bottom, and the outer side of the chuck 3 is provided with a conical surface that conforms to the guide surface. When the chuck 3 moves downward, the chuck 3 retracts, clamping and fixing the needle roller bearing 2; when the chuck 3 moves upward, the chuck 3 opens under the action of elasticity, releasing the needle roller bearing 2, making it easier to put on and take off the needle roller bearing 2.

[0023] On the rotating shaft 4, on both sides corresponding to the axial direction of the chuck 3, there are respectively a first limiting step 402 and a second limiting step 403. The first limiting step 402 and the second limiting step 403 are arranged opposite to each other, and the distance between them forms the limiting range for the axial movement of the chuck 3. This limits the axial movement distance of the chuck 3 within the rotating shaft 4, thereby ensuring that when the chuck 3 performs axial extension and retraction to clamp or release the bearing, there will be no problems such as assembly interference, component collision or loss of clamping force.

[0024] The first limiting step 402 and the second limiting step 403 obstruct both ends of the chuck 3, making it difficult to install. Therefore, in this embodiment, the rotating shaft 4 is composed of a shaft body 404 and a shaft head 405, which are fixed by bolts. The shaft head 405 is located at the top, the first limiting step 402 is located on the shaft head 405, and the second limiting step 403 is located on the shaft body 404. During installation, the chuck 3 is first inserted into the shaft body 404, and then the shaft head 405 is installed. When the chuck 3 moves downward to clamp and fix the needle roller bearing 2, the lower end of the chuck 3 presses against the second limiting step 403, generating friction, thereby allowing the chuck 3 to rotate synchronously with the rotating shaft 4. At the same time, the shaft head 405 presses against the upper end face of the inner ring of the first rolling bearing 6 to fix the position of the first rolling bearing 6. A locking nut 8 is also threaded onto the rotating shaft 4, and the locking nut 8 presses against the lower end face of the inner ring of the second rolling bearing 7 to fix the position of the second rolling bearing 7.

[0025] A connecting block is installed on the upper surface of the workbench 19 and is fixed by bolts. Four vertically extending guide posts 22, positioned in a positive direction, are installed on the connecting block. Bolts pass through the connecting block from bottom to top and are fixedly connected to the lower end of the guide posts 22. A top plate 23 is connected to the upper end of the guide posts 22. Bolts pass through the top plate 23 from top to bottom and are threadedly connected to the upper end of the guide posts 22, thus fixing the top plate 23 to the guide posts 22. A guide sleeve 25 is slidably connected to the guide posts 22 and is fixedly installed on the lifting plate 24. A lifting cylinder 26 is installed on the upper end of the top plate 23. The piston rod of the lifting cylinder 26 extends downward and is fixedly connected to the lifting plate 24 to drive the lifting plate 24 to rise and fall. The lifting plate 24 extends towards the base and is equipped with a grease fitting head 1. When the lifting plate 24 descends, the grease fitting head 1 is inserted into the needle roller bearing 2 and contacts the needle rollers 201 in the needle roller bearing 2 to achieve rolling connection. The lower end of the grease applicator 1 has a radially extending oil outlet 101. A measured amount of grease flows out through the oil outlet 101 and is injected into the needle roller bearing 2, filling 30-50% of the internal volume of the needle roller bearing 2. On the radial projection surface of the needle roller bearing 2, the projection area of ​​the needle rollers 201 inside the needle roller bearing 2 covers the oil outlet 101. After grease application is completed, the lifting plate 24 rises, and the grease applicator 1 disengages from the needle roller bearing 2, thus facilitating the removal and placement of the needle roller bearing 2.

[0026] A connector 27 is provided inside the chuck 3, and the lower end of the connector 27 abuts against a boss inside the chuck 3. A pull rod 9 is inserted into the rotating shaft 4, and a bolt passes downward through the connector 27 and is threadedly connected to the upper end of the pull rod 9, thereby connecting and fixing the pull rod 9 to the chuck 3. A telescopic cylinder 10 with its drive end facing upward is installed directly below the pull rod 9, and the piston rod of the telescopic cylinder 10 is fixedly connected to the lower end of the pull rod 9 to drive the chuck 3 to rise and fall.

[0027] like Figure 3As shown, the piston rod of the telescopic cylinder 10 is threadedly connected to a connector 20. A bearing seat 11 is coaxially mounted on the upper end of the connector 20 and secured with bolts. The inner wall of the bearing seat 11 has a radially protruding retaining ring 111. Two third rolling bearings 12, spaced apart vertically, are respectively engaged with the retaining ring 111 on both axial sides. A retaining ring 13 is provided on the lower end face of the inner ring of the lower third rolling bearing 12. A locking bolt 14 passes upward through the retaining ring 13 and is threadedly connected to the lower end of the pull rod 9, achieving axial limiting constraint on the lower third rolling bearing 12. A limiting nut 15 is also threadedly connected to the pull rod 9. The limiting nut 15 abuts against the upper end face of the inner ring of the upper third rolling bearing 12, completing the axial locking constraint on the upper third rolling bearing 12. Under the action of the third rolling bearings 12, when the chuck 3 rotates, the piston rod of the telescopic cylinder 10 remains in a fixed position, preventing damage to the telescopic cylinder 10. Meanwhile, under the action of the locking bolt 14 and the limit nut 15, the telescopic cylinder 10 can stably drive the chuck 3 to stretch, without causing the third rolling bearing 12 to disengage from the bearing seat 11.

[0028] A motor base 21 is provided on the lower end face of the worktable 19 and is fixed by bolts. A motor 16 is mounted on the motor base 21, with the drive end of the motor 16 facing upwards, and a drive gear 17 is fixedly mounted thereon. A driven gear 18 that meshes with the drive gear 17 is fixedly mounted on the rotating shaft 4. When the motor 16 starts, it can drive the rotating shaft 4 to rotate, thereby driving the chuck 3 to rotate. Moreover, the rotational speed of the chuck 3 is not less than 10,000 r / min. The centrifugal force generated in this way actively and quickly throws the grease into the internal gap of the needle roller bearing 2, overcoming the problem of slow grease injection caused by the high viscosity of grease in the traditional pressure penetration method; at the same time, the grease diffuses evenly along the inner wall under centrifugal force, so that the grease fills the inside of the needle roller bearing 2 more fully and evenly. In this embodiment, the oil outlet 101 is directly opposite the center position of the needle roller 201 to make the grease filling more even. Moreover, the centrifugal force drives the grease to diffuse to both sides of the needle roller 201 axially, effectively avoiding the problem of grease leakage from both ends of the bearing. Therefore, this invention does not require an additional end sealing structure, reducing the complexity of the device and the assembly cost. The rotation speed is set to 10,000 r / min or higher to ensure that the centrifugal force is sufficient to overcome the resistance to grease flow. The centrifugal force throws the grease toward the inner wall of the needle roller bearing 2, while the rotation of the needle roller 201 also carries the adhering grease into the inner side of the needle roller bearing 2. Therefore, under the combined action of the revolution and rotation of the needle roller 201, the grease is fully penetrated and distributed inside the needle roller bearing 2, thereby improving the efficiency and quality of grease application.

[0029] The number of teeth in the driving gear 17 is greater than that in the driven gear 18. This allows for a reduction in the size of the motor 16 while still meeting the required speed, thereby lowering the cost.

[0030] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A centrifugal automatic grease filling device for needle roller bearings with outer rings, characterized in that, include: A grease filling head (1) is inserted into the needle roller bearing (2), and an oil outlet hole (101) is provided on the grease filling head (1). A certain amount of grease flows out through the oil outlet hole (101) and is injected into the needle roller bearing (2). On the radial projection surface of the needle roller bearing (2), the projection area of ​​the needle rollers (201) inside the needle roller bearing (2) covers the oil outlet hole (101). The collet (3) is used to clamp and fix the outer ring of the needle roller bearing (2); The rotary drive assembly drives the chuck (3) to rotate, causing the needle rollers (201) inside the needle roller bearing (2) to make a circular revolution. At the same time, the needle rollers (201) achieve their own rotation by rolling with the grease filling head (1). The rotation speed of the chuck (3) is not less than 10000 r / min. The centrifugal force generated by the rotation drives the grease to be thrown towards the inner wall of the needle roller bearing (2). After the grease touches the inner wall, it spreads along the axial direction of the needle roller bearing (2) to both sides. It is also provided with a rotating shaft (4), and the clamp (3) is inserted into the guide hole (401) inside the rotating shaft (4); On the rotating shaft (4), on both sides of the axial direction of the corresponding chuck (3), a first limiting step (402) and a second limiting step (403) are respectively provided. The first limiting step (402) and the second limiting step (403) are arranged opposite to each other, and the distance between them forms the limiting range for the axial movement of the clamp (3); It also includes a fixed support (5); The support (5) has a first locking platform (501) and a second locking platform (502) facing opposite directions at its two axial ends. The first card holder (501) is equipped with a first rolling bearing (6), and the second card holder (502) is equipped with a second rolling bearing (7). The rotating shaft (4) is rotatably connected to the first rolling bearing (6) and the second rolling bearing (7), and the shaft end (405) presses against the inner ring end face of the first rolling bearing (6); A locking nut (8) is also threaded onto the rotating shaft (4), and the locking nut (8) presses against the inner ring end face of the second rolling bearing (7); The clamp (3) is coaxially and fixedly connected to the pull rod (9); The pull rod (9) is driven by the telescopic cylinder (10) to achieve axial extension and retraction, thereby driving the chuck (3) to complete the clamping or loosening action of the needle roller bearing (2); The drive end of the telescopic cylinder (10) is fixedly mounted with a bearing seat (11). The bearing housing (11) is equipped with a third rolling bearing (12), and one end of the pull rod (9) is inserted into the inner ring of the third rolling bearing (12) so that when the pull rod (9) rotates with the shaft (4), the piston rod of the telescopic cylinder (10) remains in a fixed position. The bearing housing (11) has a radially protruding retaining ring (111) on its inner wall, and the third rolling bearing (12) is respectively engaged with the retaining ring (111) on both axial sides. A retaining ring (13) is provided on the inner ring end face of the third rolling bearing (12) near the telescopic cylinder (10). The locking bolt (14) passes through the retaining ring (13) and is threadedly connected to the pull rod (9) to realize the axial limiting constraint of the third rolling bearing (12) on this side. The tie rod (9) is also threaded with a limit nut (15), which abuts against the outer end face of the inner ring of the third rolling bearing (12) on the other side, thus completing the axial locking constraint of the third rolling bearing (12) on that side.

2. The centrifugal automatic grease filling device for needle roller bearings with outer rings according to claim 1, characterized in that: The rotating shaft (4) is composed of a shaft body (404) and a shaft head (405); The first limiting step (402) is provided on the shaft head (405), and the second limiting step (403) is provided on the shaft body (404).

3. The centrifugal automatic grease filling device for needle roller bearings with outer rings according to claim 1, characterized in that: The rotary drive assembly includes a motor (16), and the output drive end of the motor (16) is fixedly provided with a drive gear (17). A driven gear (18) is fixedly provided on the rotating shaft (4), and the driven gear (18) meshes with the driving gear (17) for transmission. The number of teeth of the driving gear (17) is greater than the number of teeth of the driven gear (18).

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