A grease injection packaging structure and a grease packaging method for a paired single-sided dustproof cover bearing

Abstract

The application discloses a grease injection and packaging structure and a grease packaging method of a pair of single-side dustproof cover bearings, and relates to the technical field of bearing packaging. When the single-side dustproof cover bearings are used in pairs, the pre-injected grease is prone to leakage, the quality of the self-injected grease is difficult to control, and the ordinary packaging cannot realize internal sealing. The application comprises a first polyethylene plastic plate and a second polyethylene plastic plate, the plastic plates are provided with a buckle part, a sealing support part and a combination part, the buckle part is provided with uniformly distributed elastic clamping claws, the clamping claws are provided with a guide inclined surface and a clamping convex platform, and the clamping convex platform is clamped with an inner wall of a bearing inner ring; the elastic sealing lip at the outer edge of the sealing support part is in elastic contact with the inner diameter wall of the bearing outer ring to form radial sealing; the combination parts of the two plastic plates abut against each other to limit the axial relative displacement. When the bearings are packaged, the two plastic plates are pressed into the bearings from both ends to complete clamping and sealing; when the bearings are used, the elastic clamping claws are deformed and separated by pressing the buckle part; and the bearings can be taken out by axially pulling out the plastic plates. The pre-injected grease is prevented from leaking during storage and transportation.

Description

Technical Field

[0001] This invention relates to the field of bearing packaging, specifically to a grease-filling packaging structure and method for paired single-sided dust cover bearings. Background Technology

[0002] Single-sided dust cover bearings have a dust cover installed on only one side of the bearing, while the other side remains open. In actual operation, two bearings are usually used as a set. The dust cover is generally made of thin metal sheet by stamping and is fixedly installed on one set of bearing rings, without contacting the other set, thus forming a non-contact sealing structure. The original intention of retaining the open side was to facilitate the user to add grease to the bearing later according to the actual operating conditions of their equipment. However, this structure exposes many practical problems in the production, storage, and transportation stages.

[0003] First, if the bearing manufacturer completes the grease filling before the bearing leaves the factory, the open end of the bearing lacks a closed structure, resulting in insufficient overall sealing. During long-distance transportation or warehouse storage, the grease inside the bearing can easily flow and leak from the open side, directly causing the actual grease filling amount inside the bearing to fall short of the design requirements. This deviation in grease quantity disrupts the initial lubrication conditions when the bearing is put into use, directly shortening its service life.

[0004] Secondly, if the bearing is not pre-lubricated at the factory and the grease filling is left to downstream users, most sites lack specialized bearing grease filling equipment and quantitative control methods, making it difficult to control the total amount of grease added and ensuring even distribution of the grease inside the bearing. Excessive grease filling leads to increased frictional heat generation during bearing operation, exceeding operating temperature limits, and increasing rotational friction resistance. Insufficient grease filling, on the other hand, results in inadequate lubrication of rolling contact points, accelerating bearing wear. Both situations reduce the bearing's operational reliability and affect the operation of the entire equipment.

[0005] Third, current industry practices for packaging these bearings typically involve simply placing them in plastic bags or paper boxes. This only provides external protection against dust and rust on the bearing's outer surface, failing to seal the internal cavity and thus not addressing the issues of grease loss and leakage. After the bearings arrive, users must perform an additional grease injection process before assembly, increasing on-site assembly steps and lengthening the equipment installation and commissioning cycle. Summary of the Invention

[0006] In order to solve the problems of easy leakage of factory-pre-filled grease when bearings with single-sided dust covers are used in pairs, difficulty in controlling the quality of grease filling by users, and inability to achieve internal sealing with ordinary packaging, this invention provides a grease filling packaging structure and grease packaging method for bearings with paired single-sided dust covers.

[0007] The technical solution of this invention is:

[0008] A grease injection packaging structure for a pair of single-sided dust cover bearings includes a first plastic plate, a second plastic plate, and a single-sided dust cover bearing. The first plastic plate and the second plastic plate are detachably connected, and the first plastic plate and the second plastic plate are respectively assembled on the side of the single-sided dust cover bearing where the dust cover is provided.

[0009] The first and second plastic plates include a snap-fit ​​part, a sealing support part, and a joint part;

[0010] The latching part includes several elastic claws evenly arranged in the circumferential direction. The free end of the elastic claw is provided with a guide slope and a locking boss. The locking boss engages and limits the engagement on the inner wall of the inner ring of the single-sided dust cover bearing.

[0011] The outer edge of the sealing support is provided with an elastic sealing lip, which elastically contacts the inner diameter wall of the outer ring of the single-sided dust cover bearing to form a radial sealing structure.

[0012] When pressure is applied to the buckle, the elastic claw undergoes elastic deformation, and the engaging boss retracts inward and disengages from the inner wall of the inner ring of the single-sided dust cover bearing. The first plastic plate and the second plastic plate are pulled out along the axial direction of the single-sided dust cover bearing.

[0013] Furthermore, the first and second plastic plates are polyethylene plastic plates, and the first and second plastic plates are respectively installed on the end faces of the assembly bearing two single-sided dust cover bearings.

[0014] Furthermore, the joint is located in the central region of the sealing support. After the first plastic plate and the second plastic plate are respectively assembled into place, the joint of the first plastic plate and the second plastic plate abuts against each other to restrict the axial relative displacement between the first plastic plate and the second plastic plate.

[0015] Furthermore, the elastic claw is integrally injection molded with the first plastic plate and the second plastic plate. During assembly, the inner ring end face of the single-sided dust cover bearing is pressed against the guide slope, causing the elastic claw to deform and open. After the engaging boss passes the inner ring end face of the single-sided dust cover bearing, the elastic claw rebounds, thereby achieving engagement and fixation between the engaging boss and the inner wall of the inner ring of the single-sided dust cover bearing.

[0016] Furthermore, the elastic sealing lip and the sealing support are integrally formed thin lip structures, which continuously adhere to the inner diameter wall of the outer ring of the single-sided dust cover bearing through their own elasticity, forming a grease-blocking seal on the open side of the single-sided dust cover bearing.

[0017] Furthermore, the elastic claws are evenly distributed along the circumference of the first and second plastic plates.

[0018] Furthermore, the guide ramp is located at the inlet end of the engagement boss facing the single-sided dust cover bearing.

[0019] Furthermore, a grease packaging method for a grease-filled packaging structure for paired single-sided dust cover bearings includes the following steps:

[0020] Step 1: Perform a quantitative grease injection operation on the two single-sided dust cover bearings that are assembled in pairs;

[0021] Step 2: Take two polyethylene plastic sheets, namely the first plastic sheet and the second plastic sheet, and press them into the bearing end face of the single-sided dust cover from both ends of the paired bearing assembly.

[0022] The inner ring of the single-sided dust cover bearing presses against the guide slope of the elastic claw, causing the elastic claw to open elastically. When the engaging boss passes the end face of the inner ring of the single-sided dust cover bearing, the elastic claw rebounds, and the engaging boss engages with the inner wall of the inner ring of the single-sided dust cover bearing, completing the engagement and fixation of the snap-fit ​​part. At the same time, the elastic sealing lip on the outer edge of the sealing support part makes elastic contact with the inner diameter wall of the outer ring of the single-sided dust cover bearing, sealing and protecting the internal grease of the single-sided dust cover bearing.

[0023] Step 3: When it is necessary to remove the single-sided dust cover bearing, apply pressure to the snap-fit ​​part of the polyethylene plastic plate. The elastic claw will deform elastically, and the engaging boss will retract inward and disengage from the engaging limit of the inner ring of the single-sided dust cover bearing. Pull out the first and second plastic plates along the axial direction of the single-sided dust cover bearing to release the packaging constraints at both ends. Take out the pair of single-sided dust cover bearings and start the installation operation directly.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] This invention uses a one-piece injection-molded polyethylene plastic sheet as the packaging component. With fewer parts and lower mold-making difficulty, it is suitable for large-scale production by bearing manufacturers. The entire package is directly installed at both ends of the paired bearings without adding excessive external dimensions. The overall packaging is compact and does not impose any additional burden on bearing packing, storage, or transportation.

[0026] This invention utilizes a radial seal between an elastic sealing lip on a plastic plate and the inner diameter wall of the bearing's outer ring, allowing manufacturers to complete precise grease filling during the manufacturing process. The sealing structure prevents grease from leaking from the open side of the bearing during storage and transportation, ensuring the grease level remains within the design range. After delivery, the bearing maintains a stable initial lubrication state, avoiding the quality risks of overfilling or underfilling caused by on-site grease filling and eliminating the need for specialized tooling for on-site grease filling.

[0027] This invention utilizes a snap-on quick-release packaging structure with elastic claws. During assembly, the guide ramp automatically opens and closes the clips. Disassembly requires only manual pressing of the clips, utilizing the elasticity of the plastic parts to retract and disengage the locking protrusions. No screwdrivers, pry bars, or other tools are needed throughout the process. Operators can easily pull out the two plastic plates axially with a simple press, quickly releasing the bearing. This not only shortens the preparation time before the bearing is installed and lowers the operational threshold for on-site assembly, but also, after the two plastic plates are assembled, the joint at the center abuts against each other, limiting axial displacement between the two plastic plates. This prevents the plastic plates from loosening due to transportation bumps, ensuring the sealing structure remains effective throughout storage and transportation, and further stabilizing the reliability of the bearing packaging protection. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure after the first and third plastic plates are combined.

[0030] Figure 3 yes Figure 1 A magnified view of part A in the image;

[0031] Figure 4 yes Figure 1 A magnified view of part B in the image;

[0032] Figure 5 This is a structural diagram of the first plastic sheet;

[0033] Figure 6 This is a schematic diagram of the structure of the second plastic sheet;

[0034] Figure 7 This is a structural diagram of two single-sided dust cover bearings assembled in pairs;

[0035] Figure 8 yes Figure 7 A sectional view;

[0036] In the diagram: 1. First plastic plate, 2. Second plastic plate, 3. Single-sided dust cover bearing, 4. Buckle part, 5. Sealing support part, 6. Joint part;

[0037] 41. Elastic jaws; 42. Guide ramps; 43. Engaging bosses;

[0038] 51. Flexible sealing lip. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Specific implementation method one:

[0041] Combination Figure 1 — Figure 8 This embodiment describes a grease injection packaging structure for a pair of single-sided dust cover bearings, comprising a first plastic plate 1, a second plastic plate 2, and a single-sided dust cover bearing 3. The first plastic plate 1 and the second plastic plate 2 are detachably connected, and the first plastic plate 1 and the second plastic plate 2 are respectively assembled on the side of the single-sided dust cover bearing 3 where the dust cover is provided.

[0042] Both the first plastic plate 1 and the second plastic plate 2 are composed of a snap-fit ​​part 4, a sealing support part 5, and a connecting part 6. The snap-fit ​​part 4 is equipped with elastic claws 41, which are evenly arranged along the circumference of the plastic plate. The ends of the elastic claws 41 are machined with guide bevels 42 and engaging bosses 43, which clamp and limit the plate against the inner wall of the inner ring of the single-sided dust cover bearing 3.

[0043] The outer edge of the sealing support part 5 is machined with an elastic sealing lip 51. The elastic sealing lip 51 is attached to the inner diameter wall of the outer ring of the single-sided dust cover bearing 3, and a radial seal is formed by contact compression.

[0044] During actual disassembly, an inward pressing force is applied to the latch 4. The elastic claw 41 deforms elastically under the external force, and the engaging boss 43 retracts inward, disengaging from the engaging constraint of the inner wall of the bearing inner ring. At this point, the first plastic plate 1 and the second plastic plate 2 can be pulled outward along the axial direction of the bearing, completing the disassembly of the packaging structure. Specific Implementation Method Two:

[0046] Combination Figure 1 — Figure 8 This embodiment describes a grease-filled packaging structure for a pair of single-sided dust cover bearings. The first plastic plate 1 and the second plastic plate 2 are polyethylene plastic plates. Two sets of single-sided dust cover bearings 3 are assembled into a bearing assembly. The first plastic plate 1 and the second plastic plate 2 are respectively installed on the end faces of the bearing assembly to protect and seal the bearing assembly from both ends. Specific implementation method three:

[0048] Combination Figure 1 — Figure 8This embodiment describes a grease-filled packaging structure for a pair of single-sided dust cover bearings. The joint 6 is located in the central area of ​​the sealing support 5. After the first plastic plate 1 and the second plastic plate 2 are pressed into place, the joint 6 of the first plastic plate 1 and the second plastic plate 2 press against each other and are aligned, thereby limiting axial movement between the first plastic plate 1 and the second plastic plate 2 and ensuring the axial position is stable after the entire packaging structure is assembled. Specific implementation method four:

[0050] Combination Figure 1 — Figure 8 This embodiment describes a grease-injection packaging structure for paired single-sided dust cover bearings. The elastic claw 41 is integrally injection molded with the first plastic plate 1 and the second plastic plate 2, requiring no additional assembly parts. During assembly, when the plastic plate is attached to the single-sided dust cover bearing 3, the inner ring end face of the single-sided dust cover bearing 3 presses against the guide slope 42 of the elastic claw 41, causing the elastic claw 41 to deform and open. After the engaging boss 43 passes over the inner ring end face of the single-sided dust cover bearing 3, the elastic claw 41 rebounds, losing the external squeezing force, and returns to its original position relying on the elasticity of the plastic itself. This achieves the engagement and fixation of the engaging boss 43 with the inner wall of the inner ring of the single-sided dust cover bearing 3, thus securing the plastic plate in place. Specific implementation method five:

[0052] Combination Figure 1 — Figure 8 This embodiment describes a grease-filled packaging structure for a pair of single-sided dust cover bearings. The elastic sealing lip 51 and the sealing support 5 are integrally formed thin-lip structures. Through its own elasticity, it continuously adheres to the inner diameter wall of the outer ring of the single-sided dust cover bearing 3, forming a grease-blocking seal on the open side of the single-sided dust cover bearing 3.

[0053] After assembly, the thin lip, relying on its own material elasticity, continues to press and adhere to the inner diameter wall of the outer ring of the single-sided dust cover bearing 3, forming a barrier on the open side of the bearing, preventing the grease inside the bearing from leaking out, and playing a role in sealing and blocking the grease. Specific implementation method six:

[0055] Combination Figure 1 — Figure 8 This embodiment describes a grease-filling packaging structure for a pair of single-sided dust cover bearings. The elastic claws 41 are evenly distributed along the circumference of the first plastic plate 1 and the second plastic plate 2. The evenly distributed elastic claws 41 ensure a uniform distribution of the clamping force of the engaging boss 43 on the bearing inner ring, preventing the plastic plates from becoming skewed after assembly, guaranteeing consistent tightness of the sealing lip, and ensuring a stable sealing effect. Specific implementation method seven:

[0057] Combination Figure 1 — Figure 8 This embodiment describes a grease injection packaging structure for a pair of single-sided dust cover bearings, wherein the guide slope 42 is disposed at the inlet end of the engaging boss 43 facing the single-sided dust cover bearing 3.

[0058] When pressing the plastic sheet, the inner ring end face of the single-sided dust cover bearing 3 pushes the elastic claw 41 along the guide slope 42, which can smoothly open the elastic claw 41, reduce assembly resistance, and facilitate on-site pressing operations. Detailed implementation method eight:

[0060] Combination Figure 1 — Figure 8 This embodiment describes a grease-filled packaging structure for paired single-sided dust cover bearings, and a grease-filled packaging method for this structure. The method includes the following steps:

[0061] Step 1: Quantitative grease injection into the bearing:

[0062] Assemble two single-sided dust cover bearings into a pair of bearing assemblies, with the dust cover sides of the two bearings facing opposite ends of the assembly, and the open sides of the bearings mating together. Using specialized grease injection equipment, apply a measured amount of grease to the raceways and rolling elements of the pair of bearings according to the specified grease amount for this bearing model, ensuring that the grease filling amount and distribution meet the design requirements. After grease injection, check to confirm there is no obvious grease overflow before proceeding with packaging.

[0063] Step 2: Press-fit and seal the plastic plates at both ends:

[0064] Two matching polyethylene plastic plates are selected, namely the first plastic plate 1 and the second plastic plate 2. Holding the plastic plates, align them with both ends of the paired bearing assembly, so that the side of the plastic plate facing the bearing is aligned with the end face of the bearing dust cover, and press them in smoothly inward along the bearing axis. During the pressing process, the end face of the bearing inner ring will contact the guide slope 42 of the elastic claw 41. Under the action of axial pressure, the guide slope 42 is squeezed, which drives the multiple sets of elastic claws 41 evenly distributed along the circumference to undergo elastic deformation that opens outward. As the pressing force continues to be applied, the engaging boss 43 follows the elastic claw 41 past the end face of the bearing inner ring. When the engaging boss 43 is completely inside the inner diameter of the bearing inner ring, the external pressing force disappears, and the elastic claws 41 return to their original position due to the elastic rebound of the polyethylene material itself. The engaging boss 43 is firmly engaged on the inner wall of the bearing inner ring, completing the engagement and fixation of the snap-fit ​​part 4. After the plastic plates are pressed into place, the joint 6 at the center of the two plastic plates abuts against each other, restricting the axial movement between the two plastic plates and preventing them from shifting inward. At the same time, the elastic sealing lip 51 integrally formed on the outer edge of the sealing support 5 is squeezed and pressed tightly against the inner diameter wall of the outer ring of the single-sided dust cover bearing 3, forming a continuous radial seal. This seals the internal grease chambers of the paired bearings, preventing grease from leaking out of the bearing gaps during storage and transportation.

[0065] Step 3: Unpack and remove the bearing:

[0066] When using this set of paired single-sided dust cover bearings, there is no need to use screwdrivers, pry bars, or other tools. Simply press the corresponding snap-fit ​​parts 4 on the outer side of the plastic plates from both ends of the bearing assembly by hand. The pressing force is transmitted to the circumferentially distributed elastic claws 41, which undergo inward elastic deformation. The engaging boss 43 retracts inward accordingly, disengaging from the engaging limit on the inner wall of the bearing inner ring, thus releasing the locking relationship between the engaging boss 43 and the bearing inner ring. While maintaining the pressed snap-fit ​​parts, pull out the first plastic plate 1 and the second plastic plate 2 along the bearing axis, removing all plastic packaging components at both ends. This releases all constraints on the complete bearing set, allowing the paired single-sided dust cover bearings to be directly removed and assembled on the machine without the need for on-site grease injection.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A grease-filled packaging structure for paired single-sided dust cover bearings, characterized in that, It includes a first plastic plate (1), a second plastic plate (2) and a single-sided dust cover bearing (3). The first plastic plate (1) and the second plastic plate (2) are detachably connected, and the first plastic plate (1) and the second plastic plate (2) are respectively assembled on the side of the single-sided dust cover bearing (3) where the dust cover is provided. The first plastic plate (1) and the second plastic plate (2) include a snap-fit ​​part (4), a sealing support part (5) and a connecting part (6); The latching part (4) includes a plurality of elastic claws (41) evenly arranged in the circumferential direction. The free end of the elastic claw (41) is provided with a guide slope (42) and a locking boss (43). The locking boss (43) is locked and limited on the inner wall of the inner ring of the single-sided dust cover bearing (3). The outer edge of the sealing support part (5) is provided with an elastic sealing lip (51), which is in elastic contact with the inner diameter wall of the outer ring of the single-sided dust cover bearing (3) to form a radial sealing structure. When pressure is applied to the snap-fit ​​part (4), the elastic claw (41) undergoes elastic deformation, and the engaging boss (43) retracts inward and disengages from the inner wall of the inner ring of the single-sided dust cover bearing (3). The first plastic plate (1) and the second plastic plate (2) are pulled out along the axial direction of the single-sided dust cover bearing (3).

2. The grease injection packaging structure for paired single-sided dust cover bearings according to claim 1, characterized in that, The first plastic plate (1) and the second plastic plate (2) are polyethylene plastic plates, and the first plastic plate (1) and the second plastic plate (2) are respectively installed on the end faces of the assembly consisting of two single-sided dust cover bearings (3).

3. The grease injection packaging structure for paired single-sided dust cover bearings according to claim 2, characterized in that, The joint (6) is located in the central area of ​​the sealing support (5). After the first plastic plate (1) and the second plastic plate (2) are respectively assembled into place, the joint (6) of the first plastic plate (1) and the second plastic plate (2) abut against each other and are aligned, thus limiting the axial relative displacement between the first plastic plate (1) and the second plastic plate (2).

4. The grease injection packaging structure for paired single-sided dust cover bearings according to claim 1, characterized in that, The elastic claw (41) is integrally injection molded with the first plastic plate (1) and the second plastic plate (2). During assembly, the inner ring end face of the single-sided dust cover bearing (3) is squeezed against the guide slope (42), causing the elastic claw (41) to deform and open. After the engaging boss (43) passes over the inner ring end face of the single-sided dust cover bearing (3), the elastic claw (41) rebounds, realizing the engaging boss (43) and the inner ring inner wall of the single-sided dust cover bearing (3) engaging and fixing.

5. The grease injection packaging structure for paired single-sided dust cover bearings according to claim 4, characterized in that, The elastic sealing lip (51) and the sealing support (5) are integrally formed thin lip structures. Through its own elasticity, it continuously adheres to the inner diameter wall of the outer ring of the single-sided dust cover bearing (3), forming a grease blocking seal on the open side of the single-sided dust cover bearing (3).

6. The grease injection packaging structure for paired single-sided dust cover bearings according to claim 4, characterized in that, The elastic claws (41) are evenly distributed along the circumference of the first plastic plate (1) and the second plastic plate (2).

7. The grease injection packaging structure for paired single-sided dust cover bearings according to claim 4, characterized in that, The guide ramp (42) is located at the inlet end of the engagement boss (43) facing the single-sided dust cover bearing (3).

8. A grease packaging method employing the grease injection packaging structure of a paired single-sided dust cover bearing as described in any one of claims 1-7, characterized in that, The method includes the following steps: Step 1: Perform quantitative grease injection on the two single-sided dust cover bearings (3) that are assembled in pairs; Step 2: Take two polyethylene plastic sheets, namely the first plastic sheet (1) and the second plastic sheet (2), and press them into the end face of the single-sided dust cover bearing (3) from both ends of the paired bearing assembly; The inner ring of the single-sided dust cover bearing (3) presses against the guide slope (42) of the elastic claw (41), and the elastic claw (41) elastically opens. When the engaging boss (43) passes over the inner ring end face of the single-sided dust cover bearing (3), the elastic claw (41) rebounds and the engaging boss (43) engages with the inner wall of the inner ring of the single-sided dust cover bearing (3), completing the engagement and fixing of the snap-fit ​​part (4). At the same time, the elastic sealing lip (51) on the outer edge of the sealing support part (5) elastically contacts the inner diameter wall of the outer ring of the single-sided dust cover bearing (3), sealing and protecting the internal grease of the single-sided dust cover bearing (3). Step 3: When it is necessary to take out the single-sided dust cover bearing (3), apply pressure to the snap-fit ​​part (4) of the polyethylene plastic plate. The elastic claw (41) will produce elastic deformation. The snap-fit ​​boss (43) will retract inward and disengage from the snap-fit ​​limit of the inner ring of the single-sided dust cover bearing (3). Pull out the first plastic plate (1) and the second plastic plate (2) along the axial direction of the single-sided dust cover bearing (3), release the packaging constraints at both ends, and take out the pair of single-sided dust cover bearings (3) to directly carry out the installation operation.

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