Double-row solid needle bearing with seal

Abstract

The double-row solid needle bearing comprises an outer ring, a shaft pin, a double-row needle roller set and a retainer, the shaft pin is arranged in the outer ring in a penetrating mode, a gap is reserved between the side wall of the shaft pin and the inner wall of the outer ring, the retainer and the double-row needle roller set are located in the gap, the double-row needle roller set comprises two sets of needle rollers, and the two sets of needle rollers are arranged in parallel. One side wall of the roller pin is contacted with the inner wall of the outer ring, and the other side wall is contacted with the side wall of the shaft pin; an annular step is arranged on the inner wall of the outer ring, the two sets of roller pins are arranged on the two sides of the annular step respectively, and an oil adding hole is formed in the annular step and penetrates through the outer ring. The lubricating oil has the advantages of being high in lubricating performance and capable of conveniently injecting grease.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bearing technical field, especially is involved with a double row solid needle bearing with seal. BACKGROUND

[0002] Traditional single row roller bearing adopts the structure design of the cooperation of the shaft pin and the outer ring, and the following technical bottlenecks exist:

[0003] Stress concentration and fatigue failure: when the traditional bearing bears high radial load, the contact area of single roller and the raceway of inner and outer rings is limited, which leads to edge stress concentration, easily causes wear and even breakage, and shortens service life.

[0004] Lubrication efficiency is insufficient: the grease storage space of conventional bearing is limited, especially under high speed or heavy load working condition, the grease is easily extruded or lost, which leads to insufficient lubrication and aggravates friction and wear.

[0005] Anti-overturning capacity is limited: when the single row needle bearing bears overturning moment, the load distribution is uneven, which easily leads to local stress concentration and affects bearing life.

[0006] Chinese utility model patent 202020856308.7 designs double row needle bearing to solve the above bottlenecks. The bearing is designed with double row rollers inside, and the special-shaped sealing element is used for sealing, which can effectively solve the problems of stress concentration, insufficient grease storage and anti-overturning capacity. However, the special-shaped sealing element adopts single lip sealing, which has poor leakage prevention capacity for the bearing, and the special-shaped sealing element needs to be redesigned. Moreover, the grease is easy to fail during the use of the bearing, and the grease cannot be replenished. SUMMARY

[0007] The summary part of the present application is used to introduce the concept in a simple form, which will be described in detail in the specific embodiment part. The summary part of the present application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0008] The utility model discloses a double row solid needle bearing with seal to overcome the deficiencies of the prior art.

[0009] In order to achieve the above purpose, the utility model adopts the following technical scheme: a double row solid needle bearing with seal, comprising an outer ring, a shaft pin, a double row needle group, a retainer, the shaft pin is arranged in the outer ring, the shaft pin side wall and the outer ring inner wall have a gap, the retainer and the double row needle group are in the gap, the double row needle group includes two groups of needles, the two groups of needles are arranged in parallel, the needle one side wall is in contact with the outer ring inner wall, and the other side wall is in contact with the shaft pin side wall, an annular step is arranged on the outer ring inner wall, the two groups of needles are arranged on the two sides of the annular step, the annular step is provided with an oil hole, and the oil hole penetrates the outer ring.

[0010] Further, the two groups of rolling needles are symmetrically arranged in the gap.

[0011] Further, the annular step is coaxially arranged with the outer ring.

[0012] Further, the width of the annular step is greater than the running amount of the retainer in the gap, and the side surface of the annular step is in abutment with the end surface of the rolling needle.

[0013] Further, the double-row solid rolling needle bearing with sealing further comprises a dust cover, and the dust cover is provided with two groups of dust covers symmetrically arranged in the gap.

[0014] Further, the dust cover comprises a first connecting portion, a second connecting portion and a supporting portion, the first connecting portion and the second connecting portion are respectively arranged at two ends of the supporting portion, the first connecting portion is in abutment with the inner wall of the outer ring, the second connecting portion is in abutment with the side wall of the shaft pin, and the second connecting portion is in a herringbone structure.

[0015] Further, a plurality of grooves are arranged on the side wall of the retainer.

[0016] Further, a sealing groove is further arranged on the inner wall of the outer ring, and the sealing groove is provided with two groups of sealing grooves respectively arranged at two ends of the outer ring.

[0017] Further, the end surface of the rolling needle is a convex surface or a spherical surface.

[0018] Further, the retainer is made of engineering plastic or metal material.

[0019] The utility model discloses the advantages are as follows:

[0020] 1. Increase the carrying capacity. The bearing will bear the load in the operation process, and the rolling needle group of the single-row rolling needle bearing is single-row, and the stress of the rolling needle is concentrated, and the single-row rolling needle bearing is easy to fail, and the rolling needle group of the double-row rolling needle bearing with sealing is double-row, and the stress is evenly applied to each column of rolling needle, and the stress of the rolling needle is reduced, and the maximum carrying capacity of the bearing is improved.

[0021] 2. Strong anti-overturning capacity. The double-row rolling needle bearing adopts the design of two rows of rolling needles, and can bear the load from different directions at the same time. When the bearing is subjected to overturning moment, the double-row rolling needles can share the load together, and the local stress concentration problem caused by uneven stress of the single-row rolling needle is avoided. 3. The lubrication performance is enhanced. Compared with the single-row rolling needle bearing, the space for storing grease in the double-row rolling needle bearing with sealing is larger due to the shortening of the rolling needle, and the lubrication performance of the bearing can be improved. 4. The grease can be injected. The grease in the bearing will be thrown out during use, and the utility model bearing surface has an oil injection hole, and new grease can be injected when the bearing lacks grease. 5. Share the stress of the retainer. The utility model bearing outer ring is provided with an annular step, the rolling needle is in contact with the annular step during use, and the stress of the rolling needle directly on the retainer is reduced. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0023] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0024] In the attached diagram:

[0025] Figure 1 This is a schematic diagram of the structure of a double-row solid needle roller bearing with a sealing structure in one embodiment of the present invention.

[0026] Figure 2 for Figure 1 A cross-sectional view of a double-row solid needle roller bearing with a sealing structure in the illustrated embodiment.

[0027] Figure 3 for Figure 2 Enlarged view of point I in the image.

[0028] Figure 4 for Figure 2 Enlarged view of section II in the image.

[0029] Figure 5 for Figure 2 Enlarged view of section III in the image.

[0030] Figure 6 for Figure 1 A schematic diagram of the cage of a double-row solid needle roller bearing with a sealed structure in the illustrated embodiment.

[0031] The meanings of the reference numerals in the figure are as follows:

[0032] 1. Outer ring; 2. Shaft pin; 3. Double row needle roller assembly; 31. Needle roller; 4. Cage; 41. Groove; 5. Dust cover; 11. Oil filling hole; 12. First connecting part; 13. Second connecting part; 14. Annular step; 15. Sealing groove. Detailed Implementation

[0033] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0034] It should also be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0035] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0036] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0037] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0038] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] like Figures 1-6 As shown, a double-row solid needle roller bearing with a sealing structure provides high load capacity, low coefficient of friction, and excellent sealing performance, making it suitable for high-speed, heavy-load, and complex operating environments. The bearing includes an outer ring 1, a pin 2, a double-row needle roller assembly 31, and a cage 4, exhibiting a compact overall structure and stable operation.

[0040] The pin 2 passes through the interior of the outer ring 1, and a certain gap is reserved between the side wall of the pin 2 and the inner wall of the outer ring 1 to accommodate the double-row needle roller group 31 and the cage 4. The double-row needle roller group 31 consists of two sets of parallel needle rollers 31. One side of the needle roller 31 is in contact with the inner wall of the outer ring 1, and the other side is in contact with the side wall of the pin 2. The end face of the needle roller 31 is designed as a convex surface or a spherical surface to optimize the force distribution and reduce local stress concentration.

[0041] The outer ring 1 is provided with an annular step 14 coaxial with the shaft center on the inner wall, the width of which is slightly larger than the running amount of the retainer 4 in the gap, ensuring that the end face of the needle 31 is closely attached to the side face of the step, thereby providing stable axial positioning. The annular step 14 is designed with an oil adding hole 11 penetrating through the outer ring 1, and the oil adding hole 11 on the outer surface of the outer ring 1 is a flat surface, facilitating the regular supplement of lubricant and ensuring the lubricating performance of the bearing during long-time operation.

[0042] To enhance the sealing effect, two groups of dust covers 5 are symmetrically installed inside the bearing. Each group of dust covers 5 is composed of a first connecting part 12, a second connecting part 13 and a supporting part, the first connecting part 12 abuts against the inner wall of the outer ring 1, and the second connecting part 13 is in a herringbone structure and closely attached to the side wall of the shaft pin 2. The herringbone structure of the second connecting part 13 allows the dust cover 5 to have two contacts with the shaft pin 2 on one side, further improving the dustproof effect of the dust cover 5; the design of the dust cover 5 effectively blocks foreign matter from entering the bearing interior and prevents lubricant leakage.

[0043] The retainer 4 is made of engineering plastic or metal material, and the side wall thereof is designed with multiple grooves 41 for optimizing the distribution path of the lubricant and ensuring the uniformity of lubrication of the needle 31 during high-speed rotation. The inner wall of the outer ring 1 is also provided with sealing grooves 15, the side wall of the sealing groove 15 protrudes into the inner part of the outer ring, and the needle 31 is installed between the annular step 14 and the sealing groove 15, further enhancing the structural rigidity of the bearing and providing installation and positioning for the dust cover 5.

[0044] The first connecting part 12 abuts against the side wall of the sealing groove 15, serving as a positioning function for the dust cover 5, and the cooperation of the first connecting part 12 and the sealing groove 15 further improves the dustproof and sealing effect of the dust cover 5.

[0045] The application adopts the above structure to bring the following advantages:

[0046] 1. Increased load-carrying capacity: The bearing will bear load during operation, and the needle group of the single-row needle bearing is single-row, the stress concentration on the needle is easy to fail, while the double-row needle bearing with sealing has double-row needle group, the stress is evenly applied to each row of needle, the stress on the needle is reduced, and the maximum load-carrying capacity of the bearing is improved.

[0047] 2. Strong anti-overturning capacity. The double-row needle bearing adopts the design of two rows of needles arranged symmetrically, which can bear loads from different directions at the same time. When the bearing is subjected to overturning moment, the double-row needles can share the load together, avoiding the problem of local stress concentration caused by uneven stress on single-row needles.

[0048] 3. Enhanced lubricating performance. Compared with single-row needle bearings, the double-row needle bearing with sealing has a larger space for storing grease inside due to the shortening of the needle, which can improve the lubricating performance of the bearing.

[0049] 4、Can inject oil grease. The bearing in the process of use, the bearing internal grease will be thrown out, the surface of the bearing of the application has the oil injection hole, when the bearing lacks the oil grease can inject new oil grease.

[0050] 5、Share the force of retainer. The application sets annular step in the outer ring of bearing, the contact of the needle roller and annular step in the process of use of bearing, reduces the needle roller directly to the force of retainer.

[0051] The above description is only some preferred embodiments of the present disclosure and the explanation of the applied technical principles. Those skilled in the art should understand that the range of the utility model involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above utility model concept. For example, the above features are replaced with the technical features disclosed in the embodiments of the present disclosure (but not limited to) having similar functions to form technical solutions.

Claims

1. A sealed double row solid needle bearing comprising an outer race, a shaft pin, a double row needle set, a cage, said shaft pin being disposed within said outer race, a clearance being left between said shaft pin sidewall and said outer race inner wall, said cage and said double row needle set being within said clearance, characterized in that: The double-row needle roller assembly comprises two groups of needle rollers, which are arranged in parallel, with one side wall of the needle roller in contact with the inner wall of the outer ring and the other side wall in contact with the side wall of the shaft pin; the inner wall of the outer ring is provided with an annular step, and the two groups of needle rollers are arranged on both sides of the annular step respectively; the annular step is provided with an oil adding hole, and the oil adding hole penetrates the outer ring.

2. The sealed double-row solid-roller needle bearing of claim 1, wherein: The two groups of needle rollers are symmetrically arranged in the gap.

3. The sealed double-row solid-roller needle bearing with seal of claim 1, wherein: The annular step is coaxially arranged with the outer ring.

4. The sealed double-row solid pillow block needle bearing of claim 1, wherein: The width of the annular step is greater than the amount of movement of the retainer in the gap, and the side surface of the annular step is in contact with the end surface of the needle roller.

5. The sealed double-row solid pillow block needle bearing of claim 1, wherein: It also includes a dust cover, which is provided with two groups and is symmetrically arranged in the gap.

6. The sealed double-row solid-roller needle bearing of claim 5, wherein: The dust cover comprises a first connecting part, a second connecting part and a supporting part, the first connecting part and the second connecting part are arranged at both ends of the supporting part respectively, the first connecting part abuts on the inner wall of the outer ring, the second connecting part abuts on the side wall of the shaft pin, and the second connecting part is in the shape of a chevron.

7. The sealed double-row solid roller pin bearing of claim 1, wherein: The side wall of the retainer is provided with a plurality of grooves.

8. The sealed double-row solid pillow block needle bearing of claim 1, wherein: The inner wall of the outer ring is also provided with a sealing groove, which is provided with two groups and is respectively located at both ends of the outer ring.

9. The sealed double-row solid roller pin bearing of claim 1, wherein: The end surface of the needle roller is convex or spherical.

10. The sealed double-row solid pillow block needle bearing of claim 1, wherein: The retainer is made of engineering plastic or metal material.

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