Bearing seat assembly of double-row conical bearing unit

Abstract

The invention relates to a bearing seat assembly of a double-row conical bearing unit. Belongs to the technical field of rolling bearings. The bearing seat mainly solves the problems that a conventional bearing seat is poor in supporting capacity, poor in rotation precision and installation precision and difficult to adjust and maintain. The double-row conical bearing seat is mainly characterized in that the double-row conical bearing unit is connected with the bearing seat body into a whole in a seat hole through axial compression of a compression ring; single inner rings of the bearing units are fixedly connected with the transmission shaft through set screws and lantern rings on the two sides of the seat body; the end face structure of the bearing seat flange and the seat hole flange improves the assembly position precision; the sealing rings on the two sides of the seat hole completely seal the seat hole, the oil cup and the oil injection channel are lubricated, and the pressing ring is fixed through the set screw; the seat body flange, the seat hole flange and the bearing unit inner ring are provided with assembling, disassembling and adjusting holes. The double-row conical bearing unit in the bearing seat can optimize load distribution and improve the bearing capacity, and the bearing seat structure has better rotation precision and installation precision and more convenient adjustment and maintenance functions.

Description

Technical Field

[0001] This invention belongs to the field of rolling bearing technology, specifically relating to a novel bearing housing assembly with a double-row tapered bearing unit, which is applied to the rotary support of engineering machinery transmission. Background Technology

[0002] Tapered roller bearings are widely used in the transmission field of engineering equipment. In many cases, transmission systems use two tapered roller bearings together to bear the combined radial and axial loads. With the advancement of bearing technology, the transmission configuration of two tapered roller bearings is gradually evolving towards using a single unitized double-row tapered roller bearing. Existing mixer engineering equipment, with its conventional structure of two tapered roller bearings forming an intermediate support transmission, is prone to the following problems and drawbacks: 1) The two tapered roller bearings are fastened to the transmission shaft via sleeves to bear and transmit motion. The installation of the two bearings differs from each other, making it difficult to control the uniform distribution and transmission of the load. The adjustment of the preload and clearance between the two bearings is greatly affected by individual factors, and looseness, axial movement, and bearing slippage are likely to occur during operation. 2) The connection between the bearing inner ring assembly and the transmission shaft is secured with set screws. Generally, two set screws are used on one axial side of the bearing housing for securing, while the other side is not. This can lead to eccentricity and misalignment of the transmission shaft, causing large radial oscillations, making it impossible to maintain rotational accuracy and function, and reducing the service life of the mixer. 3) The axial mounting surface of the bearing assembly housing flange to the external frame and the bearing mounting surface of the axial flange inside the housing bore are not facing the same side of the housing. This requires two machining operations, making it difficult to guarantee the positional accuracy and geometric tolerances. As a result, after the bearing housing is installed with the external frame, it is difficult to guarantee the connection accuracy and coaxiality of the drive shaft and the motor coupling of the frame. 4) During installation or after a period of use, the connection between the bearing unit housing assembly housing flange and the external frame, the drive shaft and the inner ring bore of the bearing, and the housing bore and the outer ring of the bearing are all too tight, making disassembly and adjustment difficult. Summary of the Invention

[0003] The purpose of this invention is to provide a novel bearing housing assembly with a double-row tapered bearing unit, in order to eliminate and solve the problems and hidden dangers existing in the transmission of the above-mentioned mixer engineering machinery.

[0004] The technical solution of the present invention is: a bearing housing assembly for a double-row tapered bearing unit, comprising an inner bearing ring with two tapered raceways on its outer surface, two outer bearing rings, two rows of tapered rollers and two cages, a bearing housing body with bearing housing holes inside, a clamping ring and a retaining screw, characterized in that: after the inner bearing ring with two tapered raceways on its outer surface, the two outer bearing rings, the two rows of tapered rollers and the two cages are assembled, they form a double-row tapered bearing unit arranged face to face; the double-row tapered bearing unit is mounted in the bearing housing body by a clamping ring and a clamping ring retaining screw.

[0005] In the technical solution of this invention, the bearing housing has a bearing housing hole inside. One side of the bearing housing hole has an axial retaining edge, and the other side has an opening. The opening on the other side of the bearing housing hole has an internal thread, which serves as the port for axial installation and entry of the double-row bearing unit into the bearing housing hole. The outer diameter surface of the clamping ring has an external thread, and the clamping ring is threadedly connected to the bearing housing at the opening of the bearing housing hole. The axial retaining edge of the bearing housing and the clamping ring assemble the double-row tapered bearing unit and the bearing housing into a whole by axially positioning and clamping the large end faces of the outer rings of the two bearings. The tightening degree of the clamping ring through the threaded connection can adjust the preload and axial clearance of the two rows of bearings in the bearing unit.

[0006] In the technical solution of the present invention, the bearing housing body is provided with a housing flange at a position near the center of the axial direction on the outside of the bearing housing body; the axial end face of the housing hole axial stop edge of the bearing outer ring and the axial end face of the flange on the housing body body that is connected to the external frame are set to face the same side of the bearing housing body.

[0007] In the technical solution of this invention, a sealing ring is installed in the axial flange of the seat hole and the internal stepped hole of the clamping ring; on the cylindrical surfaces of the inner ring of the bearing extending beyond the sealing rings of the axial flange of the seat hole and the clamping ring at both ends, a collar and a collar set screw are arranged on one side of the clamping ring, and the same collar and collar set screw are arranged on the other side of the axial flange of the seat hole. Two collar set screws on each side are screwed into the two radial screw holes of the collar and pass through the two cylindrical holes of the bearing inner ring aligned with the collar screw holes on the cylindrical surface of the bearing inner ring, and are pressed against the drive shaft installed in the inner hole of the bearing inner ring, thus fastening the collar, the bearing inner ring and the drive shaft together.

[0008] In the technical solution of the present invention, flange screw holes are evenly distributed at circumferential intervals near the mounting holes of the flange connecting to the frame on the flange of the bearing body; axial flange screw holes are evenly distributed circumferentially on the axial flange of the bearing seat hole that contacts the outer ring of the bearing; in addition to two cylindrical holes at each end for fastening screws to pass through, there is also a radial bearing inner ring cylindrical hole on the radially opposite side of the two cylindrical holes on the cylindrical surface of the inner ring at both ends of the bearing inner ring.

[0009] In the technical solution of the present invention, the cylindrical surfaces at both ends of the inner ring of the bearing inner ring are fitted with the inner holes of the two collars with a small clearance; the inner hole of the bearing inner ring is fitted with the outer diameter of the transmission shaft with a small clearance.

[0010] In the technical solution of the present invention, a sealing ring is provided in the internal stepped hole of the axial retaining edge of the bearing seat and the internal stepped hole of the clamping ring. The cylindrical surface of the steel plate skeleton of the sealing ring is interference-fitted with the stepped hole, and the inner diameter lip of the sealing ring is interference-fitted with the cylindrical surfaces at both ends of the inner ring, thereby sealing the space of the bearing seat between the inner and outer rings.

[0011] In the technical solution of the present invention, the bearing housing has a radial screw hole on the annular seat wall at the threaded connection part between the clamping ring and the seat hole opening, and a clamping ring anti-reverse screw is installed. The screw is screwed into the screw hole and pressed against the external thread of the clamping ring to prevent the threaded connection of the clamping ring from loosening during use.

[0012] In the technical solution of the present invention, the bearing housing has an oiling channel on the sloping surface of the boss in the middle of the bearing housing flange, which leads to the position between the two outer rings of the bearing in the bearing housing hole; the oiling channel has an oil cup at the outer port of the boss sloping surface.

[0013] In the technical solution of the present invention, both the inner ring of the bearing and the two outer rings of the bearing have two tapered raceways; the inner ring of the bearing, the two outer rings of the bearing, the two rows of tapered rollers and the two cages are assembled into a double-row tapered bearing unit with face-to-face arrangement.

[0014] This invention has the following positive effects: 1. After assembling a bearing inner ring with two tapered raceways on its outer surface, two rows of tapered rollers, two cages, and two outer rings, a double-row tapered bearing unit with face-to-face arrangement is formed. The unit is assembled with the drive shaft in one go through a single bearing inner ring, which ensures that the two rows of bearings in the unit have the same assembly characteristics, thereby controlling the uniform distribution and transmission of the working load. This improves the adjustment accuracy of the preload, clearance, etc. between the two bearings, and avoids looseness, movement, and ring slippage during operation; 2. The axial end face of the bearing housing's inner seat hole flange that presses against the bearing outer ring and the axial end face of the housing flange that connects to the external frame are set to face the same side of the housing. Therefore, the machining of these two axial assembly positioning end faces can be completed in one clamping, better ensuring the two bearings have the same assembly characteristics. The relative positional accuracy and geometric tolerances between the end faces ensure better connection accuracy and coaxiality between the drive shaft and the frame motor coupling when the bearing housing flange is axially installed with the external frame, thereby improving the overall accuracy, performance, and lifespan of the transmission system; 3. By allocating the axial space of the bearing housing, the bearing inner ring is equipped with a collar and fastening screw on the axial side of the clamping ring, and also on the side of the seat hole retaining edge. Set screws are used on both sides to fasten the bearing inner ring to the drive shaft, thereby reducing and improving the eccentricity and misalignment of the drive shaft, reducing the radial oscillation of the drive shaft during operation, maintaining rotational accuracy and function, and extending the service life of the mixer; 4. Screw holes are evenly distributed at circumferential intervals on the mounting holes of the bearing housing flange that connect to the frame, allowing the frame to be moved using screws, facilitating the disassembly and adjustment of the bearing housing from the frame. Axial threaded holes are evenly distributed circumferentially on the axial flange that contacts the outer ring of the bearing housing. The outer ring of the bearing can be moved by screws to facilitate the disassembly and adjustment of the bearing and unit in the housing. In addition to two cylindrical holes at each end of the inner ring of the bearing for fastening screws to pass through, there is also a radial cylindrical hole on each radially opposite side of the two cylindrical holes. This is used to loosen the drive shaft relative to the inner ring of the bearing by moving it when the drive shaft is too tightly engaged with the inner ring of the bearing, so as to facilitate the adjustment or disassembly of the drive shaft.

[0015] This invention relates to a novel bearing housing assembly for a double-row tapered bearing unit. It features enhanced load-bearing capacity and improved uniformity of internal load distribution through direct assembly of the bearing unit with the drive shaft via the inner ring; reduced eccentricity and radial runout due to the tight connection between the bearing housing and the drive shaft on both sides via the inner ring; improved connection accuracy and coaxiality between the housing flange and the external frame, ensuring better connection accuracy and coaxiality between the drive shaft and the frame motor coupling; and easy disassembly, adjustment, and replacement of all components. It is primarily used for bearing housing support and transmission assemblies in the field of mixer engineering machinery. Attached Figure Description

[0016] Figure 1This is a side view of the bearing housing assembly of a novel double-row tapered bearing unit according to the present invention.

[0017] Figure 2 This is a front structural schematic diagram of the bearing housing assembly of a novel double-row tapered bearing unit according to the present invention.

[0018] Reference numerals: 1-Bearing outer ring; 2-Bearing inner ring; 3-Collar ring; 4-Tap roller; 5-Cage; 6-Bearing housing; 7-Clamping ring; 8-Sealing ring; 9-Collar ring set screw; 10-Oil cup; 11-Clamping ring anti-reverse screw; 12-Inner end face of seat hole flange; 13-Axial end face of flange; 14-Inner hole of bearing inner ring; 15-Cylindrical surfaces at both ends of inner ring; 16-Fitting hole of housing flange; 17-Flange screw hole; 18-Cylindrical hole of bearing inner ring; 19-Screw hole of seat hole flange; 20-Drive shaft; 21-Bearing housing hole; 22-Axial flange of seat hole; 23-Fitting flange; 24-External frame; 25-Opening of seat hole. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings.

[0020] like Figure 1 , Figure 2 As shown. An embodiment of the bearing housing assembly of a double-row tapered bearing unit of the present invention comprises a bearing inner ring 2, two rows of tapered rollers 4, two cages 5, two bearing outer rings 1, a bearing housing 6, a clamping ring 7, two sealing rings 8, a clamping ring anti-reverse screw 11, two collars 3, four collar set screws 9, and an oil cup 10. The outer surface of the bearing inner ring 2 has two symmetrical tapered raceways, and the bearing housing 6 has a housing flange 23 at a position near the center in the axial direction. The bearing housing 6 has a bearing housing hole 21 inside for mounting the double-row tapered bearing unit.

[0021] The bearing housing 6 has an axial retaining flange 22 on the left side of the bearing housing hole 21. The inner end face 12 of the axial retaining flange 22 contacts and positions the large end face of the left bearing outer ring 1. The bearing housing hole opening 25 on the right side of the bearing housing hole 21 has an internal thread that mates with the external thread of the clamping ring 7. After the clamping ring 7 is screwed into the bearing housing hole 21, its inner end face presses against the large end face of the other bearing outer ring 1. A clamping ring anti-removal screw 11 is radially provided on the annular wall of the bearing housing 6 at the opening 25 of the bearing housing hole to prevent the threaded connection of the clamping ring 7 from loosening during use. The axial retaining flange 22 of the bearing housing hole 21 has circumferentially distributed retaining flange screw holes 19 for easy bearing disassembly. The flange 23 of the bearing housing 6 has a sloping boss in the middle, which leads to the position between the two bearing outer rings 1 in the bearing housing hole 21. An oil filling cup 10 is provided at the outer end of the sloping boss of the oil filling channel. The axial end face 22 of the bearing housing bore 21 is aligned with the inner end face 12 of the bearing outer ring 1 bearing housing bore and the axial end face 13 of the flange 23 of the housing body that is connected to the external frame 24, and is set to face the same side of the housing body.

[0022] The clamping ring 7 is provided with external threads. The clamping ring 7 is screwed into the bearing seat hole 21 through the internal thread at the opening 25 of the right seat hole of the bearing seat hole 21, and is used to contact and clamp the outer ring 1 of the right bearing.

[0023] Each of the inner stepped holes on the outer side of the axial flange 22 of the bearing housing 6 and the inner stepped holes on the outer side of the clamping ring 7 is provided with a sealing ring 8. The cylindrical surface of the steel plate skeleton of the two sealing rings 8 is interference-fitted with the stepped hole, and the inner diameter lip is interference-fitted with the cylindrical surfaces 15 at both ends of the bearing inner ring, thereby sealing the space of the bearing housing between the inner and outer rings.

[0024] There are two collars 3, which are respectively installed on the cylindrical surfaces 15 at both ends of the inner ring 2. The cylindrical surfaces 15 at both ends of the inner ring are fitted with the inner holes of the collars 3 with a small clearance. Each collar 3 has two radial screw holes distributed circumferentially inside, which are aligned with two of the three radial cylindrical holes 18 distributed circumferentially at both ends of the inner ring 2. Two collar set screws 9 are screwed into the two screw holes of each collar 3 and pass through the cylindrical holes of the inner ring, pressing them against the drive shaft 20 to fasten the collars 3, the inner ring 2 of the bearing, and the drive shaft 20 together.

[0025] The installation process of this invention is as follows: First, a single bearing inner ring 2 with two tapered raceways is assembled with two rows of tapered rollers 4 and two cages 5. This is done by placing one row of tapered rollers 4 inside the window of a cage 5, passing them together through the cylindrical surfaces 15 at both ends of the inner ring 2, so that the roller assembly surrounds the tapered raceway on the outer surface of the inner ring 2. Then, using specialized equipment and tooling, the cage 5 is deformed and contracted, thereby securing the bearing. The cage 5 secures the tapered rollers 4 to the tapered raceway on this side of the bearing inner ring 2, preventing them from detaching. This completes the assembly of one side of the cage 5, one row of tapered rollers 4, and the bearing inner ring 2. The same method is used to assemble the other side of the bearing inner ring 2, one row of tapered rollers 4, the cage 5, and the bearing inner ring 2. One outer ring 1, with its large end facing into the bearing housing bore 21, is pressed into the bearing housing bore axial flange 22 onto the inner end face 12 of the bore flange. Then, the assembled shaft is axially inserted. The inner ring 2, tapered rollers 4, and cage 5 are assembled to position the inner roller group on one side onto the raceway of one bearing outer ring 1 already installed in the bearing housing bore. Another bearing outer ring 1 with its large end facing outward is pressed into the housing bore on the outer side of the bearing assembly, positioning its raceway onto the outer roller group of the bearing assembly. This completes the process of installing the double-row tapered bearing unit into the bearing housing bore. A sealing ring 8 is pressed into the stepped hole inside the clamping ring 7. Then, the clamping ring 7 is axially screwed into the housing bore from the outside (opening) of the bearing housing bore through its outer diameter thread until its end face abuts against the large end face of the bearing outer ring 1 on the outside of the housing bore. The preload and axial clearance between the two rows of bearings in the bearing unit are adjusted by adjusting the axial clamping degree of the clamping ring 7. Once appropriate, the positioning of the bearing unit is completed. Another sealing ring 8 is pressed into the stepped hole on the outside of the bearing housing bore flange. The inner diameter lip of the sealing ring 8 makes interference contact with the cylindrical surfaces on both sides of the inner ring of the bearing, sealing the space in the housing bore between the inner and outer rings of the bearing unit. The cylindrical surfaces 15 at both ends of the inner ring are fitted with the inner hole of the collar 3 with a small clearance. A collar 3 is axially mounted on each of the cylindrical surfaces 15 at both ends of the inner ring. Two radial screw holes are distributed circumferentially inside the collar 3, and these holes are aligned with two of the three radial cylindrical holes 18 on the inner ring 2. The drive shaft 20 is fitted with the inner hole 14 of the bearing inner ring with a small clearance. After the drive shaft 20 is inserted into the inner hole 14 of the bearing inner ring, the collar fastening screw 9 is screwed into the screw hole of the collar 3 to secure the drive shaft 20. 0. The clamping ring 7 is pressed and fastened into the inner hole 14 of the bearing inner ring; a radial clamping ring anti-reverse screw 11 is provided on the annular seat wall of the bearing seat at the threaded connection between the clamping ring 7 and the seat hole opening 25 to prevent the threaded connection of the clamping ring 7 from loosening during use; an oil cup 10 is screwed into the oil hole at the middle boss slope surface of the seat flange 23 of the bearing seat body 6, and grease is injected with an oil gun. After grease injection, the appearance is cleaned, and the installation of the double row tapered bearing unit bearing seat assembly is completed.

Claims

1. A bearing housing assembly for a double-row tapered bearing unit, comprising an inner bearing ring (2) with two tapered raceways on its outer surface, two outer bearing rings (1), two rows of tapered rollers (4) and two cages (5), a bearing housing body (6) with bearing housing holes inside, a clamping ring (7) and a clamping ring anti-reverse screw (11), characterized in that: The inner ring (2) of the bearing with two tapered raceways on its outer surface, the two outer rings (1), the two rows of tapered rollers (4) and the two cages (5) are assembled to form a double-row tapered bearing unit with face-to-face arrangement; the double-row tapered bearing unit is installed in the bearing housing (6) by means of a clamping ring (7) and a clamping ring anti-return screw (11).

2. The bearing housing assembly of a double-row tapered bearing unit according to claim 1, characterized in that: The bearing housing (6) has a bearing housing hole (21) inside. The bearing housing hole (21) has an axial flange (22) on one side and an opening on the other side. The opening (25) on the other side has an internal thread. The outer diameter surface of the clamping ring (7) has an external thread. The clamping ring (7) is threaded to the bearing housing (6) at the opening (25) of the seat hole. The axial flange (22) and the clamping ring (7) assemble the double-row tapered bearing unit and the bearing housing (6) into a whole by axially positioning and clamping the large end faces of the two bearing outer rings (1). The clamping ring (7) can adjust the preload and axial clearance of the two rows of bearings in the bearing unit by adjusting the tightness of the threaded connection.

3. The bearing housing assembly of a double-row tapered bearing unit according to claim 2, characterized in that: The bearing housing (6) has a housing flange (23) located on the outside of the bearing housing (6) in the axial direction near the center. The axial end face (12) of the seat hole of the bearing outer ring (1) and the axial end face (13) of the flange (23) that is connected to the outer frame (24) are set to face the bearing housing (6) on the same side.

4. The bearing housing assembly of a double-row tapered bearing unit according to claim 2 or 3, characterized in that: A sealing ring (8) is installed in the internal stepped hole of the seat hole axial flange (22) and the clamping ring (7); the bearing inner ring (2) extends to the cylindrical surfaces (15) at both ends of the inner ring beyond the sealing ring (8) of the seat hole axial flange (22) and the clamping ring (7). A collar (3) and a collar set screw (9) are arranged on one side of the clamping ring (7), and the same collar (3) and collar set screw (9) are arranged on the other side of the seat hole axial flange (22). Two collar set screws (9) on each side are screwed into the two radial screw holes of the collar (3) and pass through the two bearing inner ring cylindrical holes (18) aligned with the collar screw holes on the cylindrical surface of the bearing inner ring (2), and are pressed against the drive shaft (20) installed in the inner hole (14) of the bearing inner ring, thus fastening the collar (3), the bearing inner ring (2) and the drive shaft (20) together.

5. A bearing housing assembly for a double-row tapered bearing unit according to claim 2 or 3, characterized in that: Flange screw holes (17) are evenly distributed circumferentially near the mounting hole (16) of the flange (23) that connects to the frame; axial flange screw holes (19) are evenly distributed circumferentially on the axial flange (22) of the bearing seat hole (21) that contacts the outer ring (1) of the bearing; in addition to two cylindrical holes at each end for fastening screws to pass through, there is also a radial cylindrical hole (18) on the radially opposite side of the two cylindrical holes on the cylindrical surfaces (15) at both ends of the bearing inner ring.

6. The bearing housing assembly of a double-row tapered bearing unit according to claim 5, characterized in that: The cylindrical surfaces (15) at both ends of the bearing inner ring are fitted with the inner holes of the two collars (3) with a small clearance; the inner hole (14) of the bearing inner ring (2) is fitted with the outer diameter of the transmission shaft (20) with a small clearance.

7. The bearing housing assembly of a double-row tapered bearing unit according to claim 4, characterized in that: Each of the internal stepped holes of the axial retaining edge (22) of the bearing seat and the internal stepped holes of the clamping ring (7) is provided with a sealing ring (8); the outer diameter of the steel plate skeleton cylindrical surface of the sealing ring (8) is installed with an interference fit with the stepped hole, and the inner diameter lip of the sealing ring (8) is in interference contact with the cylindrical surfaces (15) at both ends of the inner ring, thereby sealing the bearing seat space between the inner and outer rings.

8. The bearing housing assembly of a double-row tapered bearing unit according to claim 6, characterized in that: The bearing housing (6) has a radial screw hole on the annular seat wall at the threaded connection between the clamping ring (7) and the seat hole opening (25) and is fitted with a clamping ring anti-reverse screw (11).

9. A bearing housing assembly for a double-row tapered bearing unit according to any one of claims 1-3 and 6-8, characterized in that: The bearing housing (6) has a cam slope in the middle of the flange (23) of the bearing housing (6) with an oiling channel leading to the position between the two outer rings (1) of the bearing housing (21); the oiling channel has an oiling cup (10) at the outer end of the cam slope.

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