A new sealing plug structure of a cross bearing

Abstract

The utility model relates to a novel sealing plug structure of cross bearing belongs to bearing technical field. The novel sealing plug structure of cross bearing, include: bearing inner race and bearing outer ring, be provided with sealing mechanism on the bearing outer ring, the sealing ring is connected in the clamping groove, the locating hole that penetrates sealing plug is established in sealing plug surface upper position, the convex ring surface is provided with the limit hole corresponding with locating hole, the locating hole and limit hole insert the location pin, the novel sealing plug structure above, through setting up the clamping groove in sealing plug surface and connecting the sealing ring, formed the first radial seal defense line, the guide ring of sealing plug bottom and the edge of raceway form line contact seal, constitute the second axial seal defense line, the outer thread and the inner thread mutually cooperate, and set up raw material area between both, form three seals, avoid lubricating oil from the locating hole and the location pin place to flow out, ensure that bearing keeps good lubrication state for a long time, reduce friction and abrasion.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and in particular to a novel sealing plug structure for a cross-shaped bearing. Background Technology

[0002] Crossed roller bearings, also known as crossed roller bearings, are high-precision bearings capable of simultaneously withstanding radial, axial, and overturning moments. They are widely used in robot joints, precision machine tool rotary tables, and aerospace equipment. Due to their unique structure, the outer ring of the bearing has a plug hole. This plug hole is a mounting hole provided for installing the rolling elements. After the rollers are inserted through the plug hole, the operator installs the plug into the plug hole to secure it, thus fitting the outer ring and inner ring of the bearing together as a single unit.

[0003] As shown in the reference case "A Bearing Plug Sealing Structure" (publication number CN222315677U), the design of multiple sealing grooves and sealing rings can further enhance the anti-leakage capability. If one of the sealing rings is cut off by external force, the leaked lubricating oil can still be intercepted by the remaining sealing rings, ensuring the sealing performance of the plug. This allows the bearing to maintain good lubrication during operation, reduces friction between the inner and outer rings of the bearing, and extends the service life of the crossed roller bearing.

[0004] However, when the aforementioned bearing plug is in use, although the design of multiple sealing grooves and sealing rings, along with the addition of plug holes on the outer ring of the bearing, can further enhance the anti-leakage capability, when the bottom sealing ring is damaged, lubricating oil will flow out from the positioning hole and positioning pin, affecting the lubrication effect. Utility Model Content

[0005] Therefore, it is necessary to provide a new type of sealing plug structure for cross bearings to address the problem that lubricating oil will leak from the positioning hole and positioning pin when the bottom sealing ring is damaged, thus affecting the lubrication effect.

[0006] A novel sealing plug structure for a cross-shaped bearing includes: an inner bearing ring and an outer bearing ring, wherein a sealing mechanism is provided on the outer bearing ring; the sealing mechanism includes a convex ring fixedly connected to the surface of the outer bearing ring, a plug hole penetrating the surface of the outer bearing ring on the surface of the convex ring, a sealing plug inserted into the plug hole, a retaining groove on the lower part of the surface of the sealing plug, a sealing ring retaining in the retaining groove, a positioning hole penetrating the sealing plug on the upper part of the surface of the sealing plug, and a limiting hole corresponding to the positioning hole on the surface of the convex ring, wherein a positioning pin is inserted into the positioning hole and the limiting hole.

[0007] In one embodiment, the locating pin is frustoconical at both ends, and the locating pin is interference-fitted with the locating hole.

[0008] In one embodiment, the bottom of the sealing plug has a conical cavity, and a guide ring is fixedly connected to the bottom of the sealing plug.

[0009] In one embodiment, the guide ring has a triangular vertical cross-section with its hypotenuse facing downwards.

[0010] In one embodiment, the surface of the sealing plug is provided with an external thread between the positioning hole and the sealing ring, and the inner wall of the convex ring is provided with an internal thread corresponding to the external thread.

[0011] In one embodiment, the top of the sealing plug is flush with the top of the convex ring, and a slot is formed in the center of the top of the sealing plug.

[0012] In one embodiment, the sealing plug is a polyetheretherketone (PEEK) plug, and the sealing ring is a fluororubber ring.

[0013] In one embodiment, the guide ring and the bottom of the sealing plug are integrally injection molded.

[0014] In one embodiment, the outer surface of the external thread is wound with PTFE tape.

[0015] In one embodiment, the positioning hole is arranged perpendicular to the slot.

[0016] Beneficial effects

[0017] 1. The above-mentioned novel sealing plug structure forms the first radial sealing defense line by opening a groove on the surface of the sealing plug and engaging the sealing ring; the guide ring at the bottom of the sealing plug forms a line contact seal with the edge of the raceway, constituting the second axial sealing defense line; the external thread and the internal thread cooperate with each other, and a PTFE tape is set between them to form a triple seal, preventing lubricating oil from flowing out from the positioning hole and positioning pin, ensuring that the bearing maintains a good lubrication state for a long time and reducing friction and wear;

[0018] 2. Initial positioning is achieved through the engagement of the external thread and the internal thread of the convex ring. Then, double positioning is achieved through the interference fit between the positioning hole and the positioning pin. This counteracts the radial movement and vibration impact during bearing operation, improves the anti-loosening ability of the sealing plug, ensures stability at high speeds, and avoids sealing failure caused by sealing plug misalignment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the plug hole structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the sealing plug of this utility model;

[0023] Figure 4 This is a cross-sectional view of the present invention;

[0024] Figure 5 This is a structural diagram of the sealing mechanism of this utility model.

[0025] Figure label:

[0026] 100. Inner ring of bearing; 200. Outer ring of bearing; 300. Sealing mechanism; 310. Raised ring; 320. Plug hole; 330. Sealing plug; 340. Sealing ring; 350. Locating pin; 360. Locating hole; 370. Tapered cavity; 380. Guide ring; 390. External thread. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] The following is combined with Figure 1 - Figure 5 This invention describes a novel sealing plug structure for a cross-shaped bearing.

[0029] In one embodiment, a novel sealing plug structure for a cross-shaped bearing includes: an inner bearing ring 100 and an outer bearing ring 200. A sealing mechanism 300 is provided on the outer bearing ring 200. The sealing mechanism 300 includes a convex ring 310 fixedly connected to the surface of the outer bearing ring 200. A plug hole 320 penetrating the surface of the outer bearing ring 200 is opened on the surface of the convex ring 310. A sealing plug 330 is inserted into the plug hole 320. A groove is opened at the lower position of the surface of the sealing plug 330. A sealing ring 340 is engaged in the groove. A positioning hole 360 ​​penetrating the sealing plug 330 is opened at the upper position of the surface of the sealing plug 330. A limiting hole corresponding to the positioning hole 360 ​​is provided on the surface of the convex ring 310. A positioning pin 350 is inserted into the positioning hole 360 ​​and the limiting hole.

[0030] It should be noted that the design of plugging the outer ring of the bearing with a 320mm hole will not affect the normal use of the bearing. When using it, it is necessary to ensure that the outer ring is a fixed mounting part and use the inner ring to realize the rotation function of the bearing. When installing the outer ring, it can be matched with the corresponding flange or mounting ring to ensure the normal use of the bearing.

[0031] It should also be noted that this type of sealing structure is often used in miniature bearings or high-precision applications. Through the composite design of elastic materials and metal skeletons, multi-layer sealing is achieved to prevent lubricant leakage and contaminant ingress. It is one of the common types in the bearing field.

[0032] like Figure 1 , Figure 4 and Figure 5 As shown, the locating pin 350 has frustoconical ends and is interference-fitted with the locating hole 360. The sealing plug 330 is a polyetheretherketone plug, and the sealing ring 340 is a fluororubber ring.

[0033] In this embodiment, the locating pin 350 is frustoconical at both ends, facilitating smoother insertion into the locating hole 360. The interference fit ensures a tight seal between the locating pin 350 and the sealing plug 330, effectively preventing the locating pin 350 from loosening during bearing operation. The sealing plug 330 is made of polyetheretherketone (PEEK), which possesses high strength, resistance to high and low temperatures, and good chemical stability, ensuring the structural integrity of the sealing plug 330 under complex operating conditions. The fluororubber sealing ring 340 exhibits excellent oil resistance and elasticity, fitting tightly against the inner wall of the plug hole 320 to form a radial seal, preventing lubricant leakage.

[0034] It should be noted that the outer circumferential surface of the bearing inner ring 100 is machined with V-shaped raceways intersecting at 45° to ensure smoothness when in contact with the rollers. The outer diameter of the bearing inner ring 100 matches the inner diameter of the bearing outer ring 200 to form an annular space to accommodate the rollers. Its axial width is slightly larger than the length of the rollers, providing sufficient contact area for the contact seal of the guide ring 380.

[0035] The inner circumferential surface of the bearing outer ring 200 is machined with a cross V-shaped raceway corresponding to the bearing inner ring 100. The outer surface of the bearing outer ring 200 is fixedly connected to the convex ring 310 by welding or bolts to ensure the perpendicularity of the axis of the plug hole 320 to the raceway and avoid interference between the sealing plug 330 and the roller due to installation reference deviation.

[0036] like Figure 2 , Figure 3 and Figure 4As shown, the sealing plug 330 has a tapered cavity 370 at its bottom, and a guide ring 380 is fixedly connected to the bottom of the sealing plug 330. The guide ring 380 has a triangular vertical cross-section with its hypotenuse facing downwards. An external thread 390 is formed on the surface of the sealing plug 330 between the positioning hole 360 ​​and the sealing ring 340, and an internal thread corresponding to the external thread 390 is formed on the inner wall of the convex ring 310. The top of the sealing plug 330 is flush with the top of the convex ring 310, and a slot is formed in the center of the top of the sealing plug 330. The guide ring 380 and the bottom of the sealing plug 330 are integrally injection molded. Teflon tape is wound around the outer surface of the external thread 390. The positioning hole 360 ​​is perpendicular to the slot.

[0037] In this embodiment, the tapered cavity 370 at the bottom of the sealing plug 330 reduces the overall weight of the sealing plug 330, while providing reasonable installation space for the guide ring 380 and avoiding interference with the rollers inside the bearing. The guide ring 380 has a triangular vertical cross-section with its hypotenuse facing down. It plays a guiding role when the sealing plug 330 is installed into the plug hole 320, ensuring installation accuracy. Its hypotenuse can also form line contact with the edge of the raceway, enhancing the axial sealing effect.

[0038] The external thread 390 mates with the internal thread to initially secure the sealing plug 330. Further positioning via the locating hole 360 ​​and locating pin 350 creates a double-positioning and securing mechanism, enhancing the stability of the sealing plug 330. The top of the sealing plug 330 is flush with the top of the raised ring 310, preventing structural protrusion. The slotted groove on the top facilitates installation and removal with a screwdriver. The guide ring 380 is integrally injection molded with the bottom of the sealing plug 330, strengthening the connection and preventing the guide ring 380 from detaching. The PTFE tape wrapped around the outer surface of the external thread 390 further improves the sealing performance of the threaded connection.

[0039] Working principle: When installing this new sealing plug structure, first insert the fluororubber sealing ring 340 into the groove on the surface of the sealing plug 330. Wrap PTFE tape around the surface of the external thread 390. Then, screw the sealing plug 330 into the plug hole 320 of the convex ring 310 through the slot at the top. At this time, the external thread 390 and the internal thread cooperate to achieve initial fixation. The guide ring 380 plays a guiding role during installation to ensure that the sealing plug 330 is accurately positioned. After the sealing plug 330 is installed in the appropriate position, insert the positioning pin 350 into the positioning hole 360 ​​and the corresponding limiting hole of the convex ring 310. The interference fit firmly fixes the positioning pin 350, achieving double fixation of the sealing plug 330. During bearing operation, the fluororubber seal ring 340 is in close contact with the inner wall of the plug hole 320, preventing radial leakage of lubricating oil; the guide ring 380 is in line contact with the edge of the raceway, preventing axial leakage of lubricating oil; and the PTFE tape enhances the sealing of the threaded connection. Multiple seals prevent lubricating oil from leaking from the outer ring 200 of the bearing, ensuring good bearing operation.

[0040] It should be noted that the bearing inner ring 100 and bearing outer ring 200 mentioned above are components with relatively mature existing technology. The specific model can be selected according to actual needs, and will not be elaborated here.

[0041] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A novel sealing plug structure for a cross-shaped bearing, characterized in that, include: The bearing has an inner ring (100) and an outer ring (200), wherein a sealing mechanism (300) is provided on the outer ring (200); The sealing mechanism (300) includes a convex ring (310) fixedly connected to the surface of the bearing outer ring (200). The convex ring (310) has a plug hole (320) that penetrates the surface of the bearing outer ring (200). A sealing plug (330) is inserted into the plug hole (320). A slot is provided on the lower part of the surface of the sealing plug (330). A sealing ring (340) is engaged in the slot. A positioning hole (360) is provided on the upper part of the surface of the sealing plug (330). A limiting hole corresponding to the positioning hole (360) is provided on the surface of the convex ring (310). A positioning pin (350) is inserted into the positioning hole (360) and the limiting hole.

2. The novel sealing plug structure of the cross-bearing according to claim 1, characterized in that, The positioning pin (350) has frustoconical ends and is interference-fitted with the positioning hole (360).

3. The novel sealing plug structure of the cross-bearing according to claim 1, characterized in that, The sealing plug (330) has a conical cavity (370) at its bottom, and a guide ring (380) is fixedly connected to the bottom of the sealing plug (330).

4. The novel sealing plug structure of the cross-bearing according to claim 3, characterized in that, The guide ring (380) has a triangular vertical cross-section, with the hypotenuse of the guide ring (380) facing downwards.

5. The novel sealing plug structure of the cross-bearing according to claim 1, characterized in that, The sealing plug (330) has an external thread (390) on its surface between the positioning hole (360) and the sealing ring (340), and the inner wall of the convex ring (310) has an internal thread corresponding to the external thread (390).

6. The novel sealing plug structure of the cross-bearing according to claim 1, characterized in that, The top of the sealing plug (330) is flush with the top of the convex ring (310), and a groove is formed in the center of the top of the sealing plug (330).

7. The novel sealing plug structure of the cross-bearing according to claim 1, characterized in that, The sealing plug (330) is a polyether ether ketone plug, and the sealing ring (340) is a fluororubber ring.

8. The novel sealing plug structure of the cross-bearing according to claim 3, characterized in that, The guide ring (380) and the bottom of the sealing plug (330) are integrally injection molded.

9. The novel sealing plug structure of the cross-bearing according to claim 5, characterized in that, The outer surface of the external thread (390) is wrapped with PTFE tape.

10. The novel sealing plug structure of the cross-bearing according to claim 6, characterized in that, The positioning hole (360) is set perpendicular to the slot.

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