Wet lubrication type double-row tapered roller bearing

Abstract

The utility model discloses a wet lubrication type double-row tapered roller bearing, and belongs to the technical field of bearings. The structure comprises an inner ring (6), an oil storage cavity (10), an oil outlet pipeline (9) and an oil inlet pipeline (5) are arranged in the inner ring (6), one end of the oil storage cavity (10) extends out of the inner wall of the inner ring (6) to form an air inlet hole (71), and an oil way piston (7) is arranged in the oil storage cavity (10); one end of the oil outlet pipeline (9) is communicated with the end of the oil storage cavity (10), the other end of the oil outlet pipeline (9) extends to the outer wall of the inner ring (6), an oil control assembly is arranged at the outlet end of the oil outlet pipeline (9), and the oil inlet pipeline (5) extends into the oil storage cavity (10) along the outer end face of the inner ring (6). An oil supplementing mechanism is arranged in the inner ring (6) of the structure, it is guaranteed that lubricating oil exists in the bearing all the time, and the wet type lubricating effect is achieved. The problems that when the double-row tapered roller bearing rotates at a high speed, grease is thrown to a sealing position under the action of centrifugal force, a central area is lean, and the lubricating effect is poor are solved.

Description

Technical Field

[0001] The utility model discloses a wet lubrication double-row tapered roller bearing, belonging to the technical field of bearings. Background Art

[0002] High-speed rail axle box bearings select different axle box bearings according to different loads and different working environments. Among them, double-row tapered roller bearings are common high-speed rail axle box bearings. The bearings are mainly composed of an outer ring, a rotor, a retaining frame and an inner ring. The two inner rings are installed in reverse, and the raceway adopts a tapered raceway, which is a rolling bearing formed by the cooperation of tapered rollers and outer rings.

[0003] Rolling contact fatigue is a common failure type of axle box bearings. Wear is one of the main causes of double-row tapered roller bearing failures. When the outer ring is subjected to a large impact force during operation and causes deformation of the outer shape, it will not only accelerate the loss of lubricating oil inside the bearing, but also cause external dirt and dust to enter the bearing, resulting in various damages caused by impurities. Therefore, the use of rolling bearings needs to be guaranteed by good lubrication. Grease lubrication or lubricating oil lubrication can be used according to different use occasions. The lubricating medium can effectively reduce the friction of the bearing and reduce the occurrence of wear problems to ensure a good service life of the bearing.

[0004] At present, most of the double-row tapered roller bearings on the market are lubricated with lubricating oil, but the lubricating oil is easy to lose when the bearing is working, resulting in poor lubrication effect. In addition, when the bearing rotates, especially at high speed, the grease will move toward the outer ring under the action of centrifugal force, and the rollers of the tapered roller bearing are distributed in a conical surface, which will produce an axial "pumping effect" during operation, throwing the grease toward the seal, making the center area gradually poor in oil, resulting in a grease distribution condition in which the two ends of the tapered roller bearing are more grease and the center area is relatively less grease. Utility Model Content

[0005] The technical problem to be solved by the utility model is that when the existing double-row tapered roller bearing rotates at high speed, the grease is thrown to the sealing part under the action of centrifugal force, so that the central area gradually becomes poor in oil, resulting in poor lubrication effect.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a wet-lubricated double-row tapered roller bearing, comprising an inner ring, wherein an oil storage chamber, an oil outlet pipeline and an oil inlet pipeline are arranged inside the inner ring, the oil storage chamber is a columnar structure, and one end extends out of the inner wall of the inner ring to form an air inlet hole, and an adaptive oil circuit piston is arranged near the end of the oil storage chamber near the air inlet hole; one end of the oil outlet pipeline is connected with the end of the oil storage chamber away from the oil circuit piston, and the other end extends to the outer wall of the inner ring, and an oil control component is arranged at the outlet end of the oil outlet pipeline, and the oil inlet pipeline extends along the outer end surface of the inner ring into the oil storage chamber.

[0007] Among them, the above structure also includes an oil outlet cavity, which penetrates obliquely along the outer wall of the inner ring and extends to the inner wall of the inner ring. The outlet of the oil outlet pipeline is connected to the middle of the oil outlet cavity, and the oil control component is arranged in the oil outlet cavity.

[0008] Furthermore, the oil control assembly in the above structure includes an oil outlet piston and an elastic member, one end of the elastic member is connected to the inner ring end penetrating into the oil outlet cavity, and the other end is connected to the oil outlet piston, and the oil outlet piston is adapted to the oil outlet cavity and placed in the oil outlet cavity.

[0009] Furthermore, in the above structure, the oil outlet piston is a truncated cone structure, and the large end surface is connected to the end of the elastic member.

[0010] Furthermore, in the above structure, the oil storage chamber is radially arranged in the middle of the inner ring and is arranged in an annular manner.

[0011] Furthermore, in the above structure, a single oil storage cavity is connected to at least one oil outlet pipeline, and the oil outlet pipeline is arranged in a one-to-one correspondence with the oil outlet cavity.

[0012] The structure also includes a tapered roller, which is arranged in a ring shape on the outer wall of the inner ring, and the outlet end of the oil outlet pipeline is arranged opposite to the tapered roller.

[0013] Furthermore, the above structure also includes an outer ring and a retaining frame, wherein the outer ring is sleeved outside the inner ring, the tapered roller is arranged between the inner ring and the outer ring through the retaining frame, and a sealing ring is arranged outside the retaining frame.

[0014] Furthermore, in the above structure, an oil injection pipeline connected to the lubricating oil circuit inside the bearing seat is arranged on the outer ring, and the outlet of the oil injection pipeline is close to the inner end side of the tapered roller.

[0015] Wherein, the above structure also includes an oil unloading passage, which is arranged inside the inner ring and extends along the outer wall of the inner ring to the outer end surface of the inner ring.

[0016] The beneficial effects of the utility model are:

[0017] 1. In addition to using the lubricating oil added to the outer ring for lubrication, the oil storage cavity can also store a certain amount of lubricating grease, and the left and right sides of the bearing are lubricated separately, which can improve the lubrication efficiency and capacity, do not require frequent lubrication, and reduce manpower consumption.

[0018] 2. The way to reduce contact friction is to have a sufficient low-friction isolation layer between the contact surfaces. There is always a lubricating medium inside the wet-lubricated bearing, so that when the lubricating grease with a certain viscosity is sheared, a pressure layer will be generated. This pressure layer is the common oil film, which promotes the complete lubrication of the inner and outer rings and spreads the lubricating oil all over the contact wall, which can fully reduce the loss caused by wear and increase the service life of the machinery.

[0019] 3. The sealing ring on the outside of the cage not only prevents external dust and dirt from entering the inner ring, but also prevents the leakage of lubricating oil, thereby reducing various damages caused by the invasion of external impurities.

[0020] 4. The setting of the outer ring adding lubricating medium from the center of the bearing and the intermediate oil replenishing mechanism can use centrifugal force to make the grease better lubricate the entire wall surface and achieve better lubrication effect. It can also effectively alleviate the "pumping effect" that throws grease to the seal, making the central area gradually poor in oil, resulting in a lubricating oil distribution condition with more grease at both ends of the tapered roller bearing and relatively less grease in the center.

[0021] 5. The setting of the oil circuit piston and the design of the elastic piston structure can better control the addition of lubricating oil, avoiding the situation of excessive lubricating oil at times and insufficient lubricating oil later.

[0022] 6. The inner ring lubrication structure uses the elastic part to compress inward when the bearing is working, driving the oil outlet piston to move inward, so that the oil outlet mechanism opens and the lubricating oil flows out for lubrication. This setting increases the grease lubrication time and thus extends the service life of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model.

[0024] Figure 2 For this utility model Figure 1 A schematic diagram of the enlarged structure at point A in the middle.

[0025] Figure 3 It is a schematic diagram of the structure of the utility model.

[0026] The markings in the figure are: 1. Pre-filled oil circuit; 2. Bearing seat; 3. Outer ring; 4. Cage; 5. Oil inlet pipeline; 6. Inner ring; 7. Oil circuit piston; 71. Air inlet hole; 8. Oil outlet chamber; 9. Oil outlet pipeline; 10. Oil storage chamber; 11. Tapered roller; 12. Oil drain circuit; 13. Elastic part; 131. Oil outlet piston. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings.

[0028] like Figures 1 to 3As shown, a wet lubrication double-row tapered roller bearing of the utility model comprises an inner ring 6, wherein an oil storage chamber 10, an oil outlet pipeline 9 and an oil inlet pipeline 5 are arranged inside the inner ring 6, wherein the oil storage chamber 10 is a columnar structure, and one end extends out of the inner wall of the inner ring 6 to form an air inlet hole 71, and an adaptable oil circuit piston 7 is arranged at the end of the oil storage chamber 10 near the air inlet hole 71; one end of the oil outlet pipeline 9 is connected to the end of the oil storage chamber 10 away from the oil circuit piston 7, and the other end extends to the outer wall of the inner ring 6, and an oil control component is arranged at the outlet end of the oil outlet pipeline 9, and the oil inlet pipeline 5 extends into the oil storage chamber 10 along the outer end surface of the inner ring 6. It can be understood by those skilled in the art that, in order to overcome the axial "pumping effect", the present structure is provided with an oil replenishing mechanism in the inner ring 6, and the oil replenishing structure can be preferably arranged symmetrically to prevent the leakage of lubricating grease. In fact, an oil inlet pipeline 5 is opened on the outer side of the inner ring 6. When the bearing is working, the oil inlet of the inner ring 6 is blocked by a cylindrical sealing plug to prevent grease leakage. At the same time, there is a columnar oil storage chamber 10 in the center of the inner ring 6. After the lubricating oil is injected from the oil inlet pipeline 5 on the inner ring 6, it enters the oil storage chamber 10. One end of the oil storage chamber 10 extends out of the inner wall of the inner ring 6 to form an air inlet hole 71, and there is an oil circuit piston 7 in the oil storage chamber 10, and the oil circuit piston 7 is close to the air inlet hole 71. This structure allows the centrifugal force to drive the flowing air through the air inlet hole 71 to push the oil circuit piston 7 when the bearing is working, so that the lubricating oil enters the tapered roller 11 in the center area of ​​the bearing through the oil outlet pipeline 9 to achieve lubrication. The oil control component can control the outflow of the lubricating oil in the oil storage chamber 10 under the action of centrifugal force to replenish the lubricating oil.

[0029] Preferably, the above structure also includes an oil outlet cavity 8, which is obliquely penetrated along the outer wall of the inner ring 6 and extends to the inner wall of the inner ring 6, the outlet of the oil outlet pipeline 9 is connected to the middle of the oil outlet cavity 8, and the oil control component is arranged in the oil outlet cavity 8. It can be understood by those skilled in the art that, in order to facilitate the installation of the oil control component, the present structure preferably sets the oil outlet cavity 8, and the oil outlet cavity 8 is obliquely penetrated along the outer wall of the inner ring 6, and the oil outlet cavity 8 is kept obliquely arranged, specifically, it can be arranged parallel to the tapered roller 11 on the corresponding side. And extend to the inner wall of the inner ring 6, that is, the inner end of the oil outlet cavity 8 is close to the inner wall of the inner ring 6, and the outer end is close to the outer ring 3. The outlet of the oil outlet pipeline 9 is connected to the middle of the oil outlet cavity 8, and the oil control component is arranged in the oil outlet cavity 8, so as to facilitate the control of the outflow of lubricating oil.

[0030] Preferably, the oil control assembly in the above structure includes an oil outlet piston 131 and an elastic member 13, one end of the elastic member 13 is connected to the end of the oil outlet chamber 8 penetrating the inner ring 6, and the other end is connected to the oil outlet piston 131, and the oil outlet piston 131 is adapted to the oil outlet chamber 8 and placed in the oil outlet chamber 8. It can be understood by those skilled in the art that the specific structure of the preferred oil control assembly of this structure is preferably the oil control assembly including the oil outlet piston 131 and the elastic member 13, and one end of the elastic member 13 is connected to the end of the oil outlet chamber 8 penetrating the inner ring 6, and the other end is connected to the oil outlet piston 131, so that the oil outlet piston 131 is connected to the oil outlet chamber 8 by the inner wall of the inner ring 6 through the elastic member 13, and the oil outlet piston 131 is adapted to the oil outlet chamber 8 and placed in the oil outlet chamber 8. This structure allows the bearing to compress the elastic member 13 under the action of centrifugal force when working, so that the oil outlet piston 131 contracts, and the oil outlet pipeline 9 is connected to the outer end of the oil outlet chamber 8, so that the lubricating oil flows out, and the lubricating oil in the central area is supplemented. In order to reduce the cost, it is preferred that the elastic member 13 is a spring structure.

[0031] Preferably, the oil outlet piston 131 in the above structure is a truncated cone structure, and the large end surface is connected to the end of the elastic member 13. Those skilled in the art can understand that, in this structure, the oil outlet piston 131 is preferably a truncated cone structure, and the large end surface is connected to the end of the elastic member 13. This structural setting can make the resistance of the oil outlet piston 131 moving inwardly much smaller than that of moving outwardly, so as to achieve the purpose of controlling the oil of the oil outlet piston 131 and prevent the oil piston 131 from being thrown out of the oil outlet chamber 8.

[0032] Preferably, the oil storage chamber 10 in the above structure is radially arranged in the middle of the inner ring 6 and is arranged in an annular interval. It can be understood by those skilled in the art that in order to ensure different lubrication effects in different working environments, a number of oil replenishing mechanisms can be set according to the required lubrication needs. Specifically, the oil storage chamber 10 is radially arranged in the middle of the inner ring 6, and the middle here is also the middle of the axial width of the inner ring 6. The oil storage chamber 10 is arranged radially along the inner ring 6. Since there is more than one oil storage chamber 10, it is arranged in an annular interval.

[0033] Preferably, in the above structure, a single oil storage cavity 10 is connected to at least one oil outlet pipeline 9, and the oil outlet pipeline 9 is arranged in a one-to-one correspondence with the oil outlet cavity 8. It can be understood by those skilled in the art that in order to increase the lubrication points in the central area, a single oil storage cavity 10 of the present structure is connected to at least one oil outlet pipeline 9, but it is necessary to ensure that the oil outlet pipeline 9 is arranged in a one-to-one correspondence with the oil outlet cavity 8, so as to facilitate the purpose of oil control.

[0034] Preferably, the above structure further includes a tapered roller 11, which is arranged in an annular shape on the outer wall of the inner ring 6, and the outlet end of the oil outlet pipeline 9 is arranged opposite to the tapered roller 11. It can be understood by those skilled in the art that, since the bearing transmits rotation through the tapered roller 11, the tapered roller 11 is arranged in an annular shape on the outer wall of the inner ring 6, and the actual tapered roller 11 is located in the tapered raceway between the outer ring 3 and the inner ring 6, and is fixed in the cage 4. In this structure, the outlet end of the oil outlet pipeline 9 is preferably arranged opposite to the tapered roller 11 to ensure the lubrication effect.

[0035] Preferably, the above structure also includes an outer ring 3 and a retainer 4, the outer ring 3 is sleeved outside the inner ring 6, the tapered roller 11 is arranged between the inner ring 6 and the outer ring 3 through the retainer 4, and a sealing ring is arranged outside the retainer 4. It can be understood by those skilled in the art that the present structure also includes an outer ring 3 and a retainer 4, the outer ring 3 is actually sleeved outside the inner ring 6, the tapered roller 11 is arranged between the inner ring 6 and the outer ring 3 through the retainer 4, and a sealing ring is arranged outside the retainer 4, and the actual sealing ring should be located in the gap between the inner ring 6 and the outer ring 3. In practice, the sealing ring can be preferably a high-performance rotating shaft sealing structure integrating dustproof and sealing. The sealing ring prevents the intrusion of external impurities and avoids the leakage of lubricating oil, thereby reducing the wear of the tapered roller 11.

[0036] Preferably, the outer ring 3 in the above structure is provided with an oil filling pipeline connected to the pre-oil filling circuit 1 inside the bearing seat 2, and the outlet of the oil filling pipeline is close to the inner end side of the tapered roller 11. It can be understood by those skilled in the art that the outer ring 3 is provided with a bearing seat 2 to the outside, and the bearing seat 2 is provided with a pre-oil filling circuit 1, and the pre-oil filling circuit 1 is connected to the oil filling pipeline in the outer ring 3 for adding lubricating oil, and is provided with a sealing plug to block the oil filling port on the bearing seat 2 when the bearing is running to prevent the leakage of lubricating oil when the bearing is running. After the lubricating oil is injected, the lubricating oil enters the left and right sides of the bearing respectively through the pre-oil filling circuit 1, and then spreads the entire running track under the action of centrifugal force to form an oil film to lubricate the tapered roller 11. When no oil is injected, a specific plug is used to block the oil filling port to prevent the leakage of lubricating oil when the bearing is working.

[0037] Preferably, the above structure further includes an oil discharge oil passage 12, which is arranged inside the inner ring 6 and extends along the outer wall of the inner ring 6 to the outer end surface of the inner ring 6. It can be understood by those skilled in the art that the present structure further has an oil discharge oil passage 12 in the inner ring 6 of the bearing, and the oil discharge oil passage 12 is used to discharge the lubricating oil with impurities when the lubricating oil is replaced, thereby reducing the damage to the bearing caused by the lubricating oil containing impurities and extending the service life of the bearing.

Claims

1. A wet lubricated double row tapered roller bearing, comprising an inner ring (6), characterized in that: An oil storage chamber (10), an oil outlet pipeline (9) and an oil inlet pipeline (5) are arranged inside the inner ring (6); the oil storage chamber (10) is a columnar structure, and one end thereof extends out of the inner wall of the inner ring (6) to form an air inlet hole (71); an adaptable oil circuit piston (7) is arranged at the end of the oil storage chamber (10) close to the air inlet hole (71); one end of the oil outlet pipeline (9) is connected to the end of the oil storage chamber (10) away from the oil circuit piston (7), and the other end thereof extends to the outer wall of the inner ring (6); an oil control component is arranged at the outlet end of the oil outlet pipeline (9); and the oil inlet pipeline (5) extends along the outer end surface of the inner ring (6) into the oil storage chamber (10).

2. A wet lubricated double row tapered roller bearing according to claim 1, characterized in that: It also includes an oil outlet cavity (8), which is obliquely penetrated along the outer wall of the inner ring (6) and extends to the inner wall of the inner ring (6). The outlet of the oil outlet pipeline (9) is connected to the middle of the oil outlet cavity (8), and the oil control component is arranged in the oil outlet cavity (8).

3. A wet lubricated double row tapered roller bearing as claimed in claim 2, characterized in that: The oil control assembly comprises an oil outlet piston (131) and an elastic member (13); one end of the elastic member (13) is connected to the end of the oil outlet chamber (8) penetrating into the inner ring (6), and the other end is connected to the oil outlet piston (131); the oil outlet piston (131) is adapted to the oil outlet chamber (8) and is placed in the oil outlet chamber (8).

4. A wet lubricated double row tapered roller bearing as claimed in claim 3, characterized in that: The oil outlet piston (131) is a truncated cone-shaped structure, and the large end surface is connected to the end of the elastic member (13).

5. A wet lubricated double row tapered roller bearing as claimed in claim 4, characterized in that: The oil storage chambers (10) are radially arranged in the middle of the inner ring (6) and are arranged in an annular manner.

6. A wet lubricated double row tapered roller bearing as claimed in claim 2, characterized in that: A single oil storage chamber (10) is connected to at least one oil outlet pipeline (9), and the oil outlet pipeline (9) and the oil outlet chamber (8) are arranged in a one-to-one correspondence.

7. A wet lubricated double row tapered roller bearing as claimed in claim 1, characterized in that: It also comprises a tapered roller (11), which is arranged in an annular shape on the outer wall of the inner ring (6), and the outlet end of the oil outlet pipeline (9) is arranged directly opposite to the tapered roller (11).

8. A wet lubricated double row tapered roller bearing according to claim 7, characterized in that: It also includes an outer ring (3) and a retaining frame (4), wherein the outer ring (3) is sleeved outside the inner ring (6), the tapered roller (11) is arranged between the inner ring (6) and the outer ring (3) through the retaining frame (4), and a sealing ring is arranged on the outside of the retaining frame (4).

9. A wet lubricated double row tapered roller bearing as claimed in claim 8, characterized in that: The outer ring (3) is provided with an oil injection pipeline which is connected to the pre-oil injection pipeline (1) inside the bearing seat (2), and the outlet of the oil injection pipeline is close to the inner end side of the tapered roller (11).

10. A wet lubricated double row tapered roller bearing according to claim 1, characterized in that: It also includes an oil unloading passage (12), which is arranged inside the inner ring (6) and extends along the outer wall of the inner ring (6) to the outer end surface of the inner ring (6).

Images