WO2024040719A1

WO2024040719A1 - Bearing front sealing device having observation hole

Info

Publication number: WO2024040719A1
Application number: PCT/CN2022/125070
Authority: WO
Inventors: 夏克博; 宋世勇; 于长鑫; 谭剑光; 马忠超; 顿丽华; 田佩来; 石佳艺; 宫赫成; 宋涛; 张策
Original assignee: 瓦房店轴承集团有限责任公司; 瓦房店轴承集团国家轴承工程技术研究中心有限公司
Priority date: 2022-08-25
Filing date: 2022-10-13
Publication date: 2024-02-29
Also published as: CN115289141A

Abstract

A bearing front sealing device having an observation hole, which is applied to a railway wagon bearing and comprises a front cover (1) arranged on one side of a bearing (6) in an axial direction. A through observation hole is formed in the front cover (1); a sealing plug (2) is assembled in the observation hole; the sealing plug (2) is in interference fit with a hole wall of the observation hole; and a plurality of recesses (5) are formed in a side wall of the sealing plug (2) in contact with the observation hole. The observation hole is machined in the front cover (1), so that conditions of an axle (7) can be observed when the bearing (6) is abnormal or overhauled, thus ensuring normal operation of the bearing (6), and prolonging the service life of the bearing (6). The sealing plug (2) and the front cover (1) are in interference fit, and the recesses (5) are designed in a side face of the sealing plug (2), so that the sealing plug (2) can be conveniently assembled and disassembled when it is ensured that the sealing plug (2) is stably assembled, thus preventing the sealing plug (2) from being damaged during assembling and disassembling processes.

Description

Bearing front seal with sight hole

Technical field

The invention belongs to the technical field of bearing assembly and manufacturing, and specifically relates to a bearing front sealing device with an observation hole applied to railway freight car bearings.

Background technique

As a mode of transportation in modern society, railway truck transportation has extremely obvious advantages in terms of safety, economy, and efficiency. As the load-bearing unit of railway freight cars, the bearing unit is the basis for ensuring the stability and safety of railway freight cars.

technical problem

The existing front sealing device of railway freight car bearings is a closed integral structure. When checking the condition and information of the shaft end, the entire front sealing device can only be removed. It is time-consuming and labor-intensive and is not conducive to the overall operation of the bearing.

Technical solutions

Based on the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a bearing front sealing device with an observation hole to facilitate inspection and observation of the condition of the bearing shaft end.

In order to achieve the above object, the technical solution adopted by the present invention is: a bearing front sealing device with an observation hole, including a front cover arranged on one side of the bearing in the axial direction, and the front cover is provided with a through observation hole, and the observation hole is A sealing plug is installed inside, and the sealing plug is an interference fit with the hole wall of the observation hole. A number of grooves are provided on the side wall of the sealing plug in contact with the observation hole.

Further, the bearing is sleeved on the end of the shaft, the front cover is detachably connected to the shaft, and the front cover is in contact with the end face of the inner ring of the bearing.

Further, the front cover is connected and fixed with the shaft end surface through a number of connecting bolts.

Further, an anti-loosening piece is provided on the side of the front cover away from the shaft end face, and the connecting bolts pass through the anti-loosing piece and the front cover in sequence and are connected to the shaft end face.

Further, the anti-loosening piece is provided as a whole, and several connecting bolts pass through the same anti-loosing piece and are connected to the shaft end surface. The anti-loosing piece is provided with a through hole corresponding to the sealing plug, so that the sealing plug is exposed through the through hole.

Further, the sealing plug is an elastic sealing plug capable of elastic deformation.

Further, the sealing plug is a rubber plug.

Further, the observation hole is located at the center of the front cover.

Further, the sealing plug is a cylindrical plug body, and the connection between the circular surfaces at both ends of the cylindrical plug body and the middle side surface is chamfered; the diameter of the sealing plug is 55.3 mm.

Further, the groove section of the side wall of the sealing plug is arc-shaped, and each groove surrounds the side wall of the sealing plug; there are two grooves.

beneficial effects

The beneficial effects of the present invention are: the present invention has an observation hole processed on the front cover, which can observe the condition of the axle when an abnormality occurs in the bearing or during maintenance, ensuring the normal operation of the bearing and improving the service life of the bearing. The sealing plug and the front cover have an interference fit, and grooves are designed on the side of the sealing plug to facilitate the assembly and disassembly of the sealing plug while ensuring the stability of the sealing plug assembly and prevent the sealing plug from being damaged during assembly and disassembly.

Description of drawings

Figure 1 is a schematic structural diagram of a bearing front sealing device with an observation hole.

Figure 2 is a schematic diagram of the sealing plug structure.

Figure 3 is a schematic structural diagram of a double row tapered roller bearing in Example 2.

Figure 4 is a schematic diagram of the assembly of the roller and cage in Embodiment 2.

Figure 5 is the second assembly diagram of the roller and cage in Embodiment 2.

In the picture: 1. Front cover, 2. Sealing plug, 3. Anti-loosening piece, 4. Connecting bolt, 5. Groove, 6. Bearing, 7. Shaft, 8. Bearing inner ring, 8.1 First inner ring, 8.2 Second inner ring, 8.3 First annular groove, 8.4 Second annular groove, 9. Bearing outer ring, 10. Cage, 10.1 Window beam, 10.11 Slope surface, 10.12 Lubricating surface, 10.13 Tangential point, 11. Roller, 12 , sealing component, 13. inner spacer ring, 14. back block, 15. plastic steel connecting ring.

Best Mode of Carrying Out the Invention

In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, the present invention can be implemented in many other ways different from those described here. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

Example 1.

Referring to Figures 1-2, a bearing front sealing device with an observation hole includes a front cover 1 arranged on one side of the bearing in the axial direction. The front cover 1 is provided with a through observation hole, and a sealing plug is installed in the observation hole. 2. The sealing plug 2 is an elastic sealing plug capable of elastic deformation. The sealing plug 2 has an interference fit with the hole wall of the observation hole. Two semicircular grooves 5 are provided on the side wall of the sealing plug 2 that contacts the observation hole.

Based on the above technical solution, it should be noted that the front cover 1 is processed with an observation hole, which can observe the condition of the axle when an abnormality occurs in the bearing or during maintenance, to ensure the normal operation of the bearing and increase the service life of the bearing. The sealing plug 2 and the front cover 1 have an interference fit, which can effectively ensure the sealing effect. Since the sealing plug 2 is an elastic component, in order to ensure the sealing performance is always in a compressed state during assembly, two semicircular grooves are designed on the side of the sealing plug 2 to reserve a certain deformation space for the elastic compression of the sealing plug 2, while ensuring the sealing. On the premise that the plug 2 is assembled stably, the assembly and disassembly of the sealing plug 2 is facilitated, and the sealing plug 2 is prevented from being damaged during the assembly and disassembly process.

Further, the bearing 6 is set on the end of the shaft 7, the front cover 1 is connected and fixed with the shaft end surface through a number of connecting bolts 4, and the front cover 7 is in contact with the end surface of the bearing inner ring.

Further, the front cover 1 is a circular body that matches the diameter of the bearing. One side of the circular body has an annular protrusion that matches the end face of the bearing inner ring. The end face of the annular protrusion matches the end face of the bearing inner ring. The end face is in contact with the seal. A number of connecting bolts 4 pass through the circular body and are connected to the shaft end face in the axial direction. There is a certain space between the circular body and the shaft end face to ensure that the connecting bolts can be tightened and the front cover is squeezed toward the bearing. Ensure the sealing performance of the front sealing device.

Furthermore, an anti-loosening piece 3 is provided on the side of the front cover 1 away from the end face of the shaft, and the connecting bolts 4 pass through the anti-loosening piece 3 and the front cover 1 in sequence and are connected to the end face of the shaft 7 . The anti-loosening piece is provided as a whole, and several connecting bolts 4 pass through the same anti-loosing piece 3 and are connected to the shaft end surface to ensure the consistency of the installation positions of several connecting bolts. The anti-loosening piece 3 is provided with a through hole corresponding to the sealing plug, so that the sealing plug is exposed through the through hole, ensuring that the anti-loosening piece 3 and the connecting bolt 4 do not interfere with the assembly of the sealing plug 2 .

Further, the sealing plug 2 is a rubber plug. The rubber plug is made of nitrile rubber. Compared with ordinary rubber, it has better sealing and is not easy to age. Changes in ambient temperature have little impact on the material, which can prevent the rubber plug from falling off during the operation of the truck. Good sealing can prevent dust and Rain, etc. affect the service life of bearings.

Furthermore, the observation hole is located at the center of the front cover 1 . It is convenient to observe the conditions everywhere at the shaft end.

Further, the sealing plug 2 is a cylindrical plug body, and the connection between the circular surfaces at both ends of the cylindrical plug body and the middle side surface is chamfered; the diameter of the sealing plug is 55.3 mm. The thickness of the sealing plug 1 is greater than that of the front cover 1, which facilitates installation, disassembly and sealing. The diameter of the through hole corresponding to the sealing plug 2 on the anti-loosening piece 3 is 60 mm, which is larger than the diameter of the sealing plug 2. The sealing plug 2 can be completely exposed without affecting the installation and removal of the sealing plug 2.

Based on the above technical solution, it should be noted that the outer surface of the cylindrical plug is excessively smooth and evenly stressed, making it easy to assemble and disassemble.

Furthermore, the semicircular grooves on the side wall of the sealing plug have an arc-shaped cross-section, and each groove surrounds the side wall of the sealing plug.

The bearing front sealing device of the present invention has been trial-produced, and the rubber plug has good assembly performance and reliable sealing performance.

Embodiments of the invention

Example 2.

In the application of traditional engineering plastic cages, it often appears that when the cage pocket window beam guides the roller, varying degrees of annular stripes appear on the outer diameter surface of the roller. Through analysis, it is mainly due to the influence of the processing accuracy of the cage window beam, or It is caused by the unreasonable structural design of the cage window beam.

In order to solve the above problems, Embodiment 2 is improved on the basis of Embodiment 1 to provide a double-row tapered roller bearing, see Figures 1-4, including a bearing outer ring 9, a bearing inner ring 8, a cage 10 and Double rows of tapered rollers 11. Each row of tapered rollers is rolled and held between the bearing inner ring 8 and the bearing outer ring 9 through a cage 10. The cage 10 includes a number of pockets for accommodating the tapered rollers and connecting adjacent ones. Window beam 10.1 with two pockets. The two side walls of the window beam 10.1 used to form the pockets are provided with guide surfaces that match the outer circumferential surface of the conical roller. Each pocket hole matches the outer circumferential surface of the conical roller. The two guide surfaces are arranged symmetrically; the guide surfaces include a slope surface 10.11 that is in contact with the outer circumferential surface of the tapered roller and a lubricating surface 10.12 that is inclined to the slope surface. The slope surface 10.11 is in contact with the outer circumference of the tapered roller. The tangent plane is an inclined plane, and the tangent point 10.13 is located at the center of the inclined plane.

Based on the above technical solution, the angle of the cage pocket window beam is the midpoint of the window beam guide surface based on the contact point when it cooperates with the rolling element, and the angle of the window beam guide surface and the radial size of the window beam are determined based on the contact point. While ensuring that the window beam can guide the rollers to operate smoothly, it also increases the introduction of grease and improves lubrication conditions. At the same time, the cage window beam is improved to increase the grease storage space between the two rollers and improve the lubrication performance of the bearing during operation. Through the design changes of these two structures, this cage makes the internal lubrication of the bearing more sufficient, reduces the friction and temperature rise during bearing operation, reduces the occurrence of annular stripes on the outer diameter of the roller, and improves the bearing operating speed and maintenance cycle.

Furthermore, there is a gap between the lubricating surface 10.12 and the outer circumferential surface of the tapered roller. Used to store grease.

Furthermore, the lubricating surface 10.12 is an inclined plane, and the lubricating surface 10.12 is inclined toward the side close to the tapered roller in the pocket relative to the slope surface 10.11.

Based on the above technical solution, the lubricating surface 10.12 is a flat surface, and the angle is based on the angle formed when the slope is tangent to the outer diameter of the roller and the tangent point is at the midpoint of the guide slope. The clearance is determined when the radial transmission amount of the cage, combined with the rollers and the inner ring, meets the standard requirements.

Furthermore, the slope surface 10.11 is located on the side close to the outer diameter of the cage, and the lubricating surface 10.12 extends from the inner edge of the slope surface 10.11 to the inner diameter side of the cage.

By optimizing the structural design of the cage window beam, rationally designing the cage pocket window beam and the slope surface of the guide roller, ensuring the contact state between the roller and the guide surface, and improving the introduction and export of grease into the pocket, Improve lubrication and reduce ring streaks. At the same time, the angle of the cage window beam is improved to increase the grease storage space between the two rollers and improve the lubrication performance during operation. This product is suitable for heavy-duty or high-speed rail vehicle bearings. It can better improve the operating conditions and lubrication conditions of the guide rollers than traditional cages.

Further, the inner circumferential surface of the bearing outer ring 9 is provided with two rows of tapered raceways that match the tapered roller 11. The bearing inner ring includes a first inner ring 8.1 and a third inner ring 8.1 arranged side by side. The outer circumferential surfaces of the two inner rings 8.2, the first inner ring 8.1 and the second inner ring 8.2 are both provided with tapered raceways that match the tapered rollers.

Further, an inner spacer ring 13 is provided between the first inner ring and the second inner ring, and the small diameter ends of the two rows of tapered rollers are arranged oppositely.

Further, the double-row tapered roller bearing also includes a front cover 1 and a back block 14. The double-row tapered roller bearing is sleeved on the journal at the end of the shaft. The front cover 1 is connected to one end of the journal. The shaft head at the bottom is detachably connected, and the front cover 1 contacts the end face of the first inner ring 8.1 and axially limits the first inner ring; the back block 14 is set on the shoulder of the other end of the journal, The back block 14 contacts the end surface of the second inner ring 8.2 and axially limits the second inner ring. The second inner ring 8.2 and the back block 14 are connected by a plastic steel connecting ring 15.

Further, the small diameter ends of the first inner ring 8.1 and the second inner ring 8.2 are arranged oppositely, the first annular groove 8.3 is provided at the inner diameter of the large diameter end of the first inner ring 8.1, and the first annular groove 8.3 is provided at the inner diameter of the large diameter end of the second inner ring 8.2. Second annular groove 8.4. The design of the two annular grooves is the same, in order to ensure that the bearing and the back retaining ring can be connected together through the plastic steel connecting ring. It also reduces the weight of the bearing inner ring.

Furthermore, a set of sealing assemblies 12 are symmetrically arranged between the first inner ring 8.1 and the bearing outer ring 9, and between the second inner ring 8.2 and the bearing outer ring 9. The sealing assembly 12 is used for sealing inside the bearing.

Industrial applicability

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis" , "radial", "circumferential" and other indications of the orientation or positional relationship are based on the attached The orientations or positional relationships shown in the figures are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed and operated in specific orientations, and therefore cannot be understood as limiting the present invention. Limitations of Invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated into one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise specified restrictions. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

It should be noted that when an element is referred to as being "mounted" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may also be intervening elements present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

What is listed above are only the best embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many modifications are possible. All modifications that a person of ordinary skill in the art can directly derive or associate from the disclosure of the present invention should be considered to be within the protection scope of the present invention.

Claims

The bearing front sealing device with an observation hole is characterized in that it includes a front cover arranged on one side of the bearing in the axial direction, the front cover is provided with a through observation hole, and a sealing plug is installed in the observation hole. The sealing plug In interference fit with the hole wall of the observation hole, a number of grooves are provided on the side wall of the sealing plug in contact with the observation hole.
The bearing front sealing device with observation hole according to claim 1, characterized in that: the bearing is sleeved on the end of the shaft, the front cover is detachably connected to the shaft, and the front cover is in contact with the end surface of the bearing inner ring.
The bearing front sealing device with observation hole according to claim 2, characterized in that the front cover is connected and fixed with the shaft end surface through a plurality of connecting bolts.
The bearing front sealing device with observation hole according to claim 3, characterized in that: an anti-loosening piece is provided on the side of the front cover away from the shaft end face, and the connecting bolts pass through the anti-loosing piece and the front cover in sequence and are connected to on the shaft end face.
The bearing front sealing device with an observation hole according to claim 4, characterized in that: the anti-loosening piece is provided as a whole, and several connecting bolts pass through the same anti-loosing piece and are connected to the shaft end surface. A through hole corresponding to the sealing plug is provided so that the sealing plug is exposed through the through hole.
The bearing front sealing device with an observation hole according to claim 1, wherein the observation hole is located at the center of the front cover.
The bearing front sealing device with observation hole according to claim 1, characterized in that: the sealing plug is a cylindrical plug body, and the connection between the circular surfaces at both ends of the cylindrical plug body and the middle side surface is provided with an inverted angle; the diameter of the sealing plug is 55.3mm.
The bearing front sealing device with observation holes according to claim 1, characterized in that: there are two grooves.
A double-row tapered roller bearing, which is characterized by: including a bearing outer ring, a bearing inner ring, a cage and double-row tapered rollers. Each row of tapered rollers is rolled and held in the bearing inner ring and the bearing outer ring by the cage. between; the cage includes a plurality of pockets for accommodating conical rollers and a window beam connecting two adjacent pockets; the two side walls of the window beam used to form the pockets are arranged with the outer circumferential surface of the conical roller. Matching guide surfaces, two guide surfaces in each pocket that match the outer circumferential surface of the conical roller are arranged symmetrically; the guide surfaces include a slope surface that is in contact with the outer circumferential surface of the conical roller and a slope surface that is inclined to the slope surface. Lubricating surface, the slope is a slope that is tangent to the outer circumferential surface of the tapered roller, and the tangent point is located at the center of the slope.
A double row tapered roller bearing according to claim 9, characterized in that there is a gap between the lubricating surface and the outer circumferential surface of the tapered roller.
A double row tapered roller bearing according to claim 9, characterized in that: the lubricating surface is an inclined plane, and the lubricating surface is inclined relative to the slope surface close to the side of the tapered roller in the pocket.
A double row tapered roller bearing according to claim 9, characterized in that: the slope is located on the side close to the outer diameter of the cage, and the lubricating surface extends from the inner edge of the slope toward the inner diameter of the cage. extend.
A double-row tapered roller bearing according to claim 9, characterized in that: the inner circumferential surface of the bearing outer ring is provided with two rows of tapered raceways matching the tapered rollers, so The inner ring of the bearing includes a first inner ring and a second inner ring arranged side by side. The outer circumferential surfaces of the first inner ring and the second inner ring are both provided with tapered rollers that match the tapered rollers. shaped raceway.
A double-row tapered roller bearing according to claim 13, characterized in that: an inner spacer ring is provided between the first inner ring and the second inner ring, and the small diameter ends of the two rows of tapered rollers face each other. set up.
A double-row tapered roller bearing according to claim 13, characterized in that: the double-row tapered roller bearing further includes a front cover and a rear gear, and the double-row tapered roller bearing is sleeved on the shaft. On the journal at the end, the front cover is detachably connected to the shaft head at one end of the journal. The front cover contacts the end face of the first inner ring and axially limits the first inner ring; the rear gear sleeve is placed on At the shoulder of the other end of the journal, the back gear contacts the end face of the second inner ring and axially limits the second inner ring. The second inner ring and the back gear are connected by a plastic steel connecting ring.
A double row tapered roller bearing according to claim 13, characterized in that: the small diameter ends of the first inner ring and the second inner ring are arranged oppositely, and a first annular ring is provided at the inner diameter of the large diameter end of the first inner ring. groove, and a second annular groove is provided at the inner diameter of the large diameter end of the second inner ring.
A double-row tapered roller bearing according to claim 13, characterized in that a set of sealing assemblies are symmetrically arranged between the first inner ring and the outer ring and between the second inner ring and the outer ring.