Deep groove ball bearing type heavy load pin shaft structure

Abstract

The utility model relates to the field of pin shaft, and disclose a deep groove ball bearing type heavy load pin shaft structure, including the deep groove ball bearing one, two, three of equidistance arrangement along pin shaft axial, eliminate the cooperation clearance of bearing and pin shaft through the axial pre -tightening of expansion sleeve, form the parallel bearing system of multibearing, evenly share radial load, promote the carrying capacity and avoid the fretting wear, the sealing system is by half arc seal ring one and two through the fixed clamping ball quick clamping into annular of hinged and spring drive, cooperate sealed plug and block oil hole, prevent dust, water invasion at the same time, utilize the centrifugal force when pin shaft rotates to deliver the grease in oil storage tank to bearing raceway through oil hole, realize automatic lubrication, pin shaft adopts hollow structure and embeds spiral reinforcing rib, reduce the weight through three -dimensional rigid support and keep the strength, the utility model improves the carrying reliability, sealing protection and lubrication efficiency under the heavy load working condition, be applicable to the scene such as engineering machinery, mine equipment.

Description

Technical Field

[0001] This utility model relates to the field of pin shafts, specifically a deep groove ball bearing type heavy-duty pin shaft structure. Background Technology

[0002] The deep groove ball bearing type heavy-duty pin structure is a mechanical articulation assembly with a deep groove ball bearing as the core load-bearing element. It mainly consists of a pin, a deep groove ball bearing, and seals. It achieves rotation or oscillation under heavy load conditions through the rolling friction characteristics of the bearing. This structure is widely used in engineering machinery, mining equipment, heavy robotic arms and other scenarios. Its core advantage lies in using the high radial load-bearing capacity and rotational accuracy of the deep groove ball bearing to replace the surface contact friction mode of the traditional sliding pin, thereby reducing wear and improving transmission efficiency.

[0003] Traditional deep groove ball bearing heavy-duty pin structures typically employ a single-bearing layout, with radial loads entirely dependent on a single bearing. This limits their load-bearing capacity. Furthermore, the interference fit between the pin and the bearing inner ring is prone to fretting wear due to installation stress or vibration, resulting in increased clearance and decreased precision. In terms of sealing and lubrication, traditional structures often use a single lip seal, which cannot effectively prevent the intrusion of contaminants such as dust and water. In addition, the lack of automatic grease replenishment function makes the bearing prone to dry friction due to insufficient lubrication. Moreover, traditional solid pins are heavy, increasing the overall load on the equipment. Their resistance to deformation depends on material strength, making it difficult to maintain structural rigidity while reducing weight. This limits their application in mobile machinery or high-precision scenarios. Therefore, we propose a deep groove ball bearing heavy-duty pin structure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a deep groove ball bearing type heavy-duty pin shaft structure, which solves the aforementioned problems.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a deep groove ball bearing type heavy-duty pin shaft structure, including a deep groove ball bearing I, a deep groove ball bearing II, a deep groove ball bearing III, and a pin shaft, wherein the deep groove ball bearing I, the deep groove ball bearing II, and the deep groove ball bearing III are fixedly installed at equal intervals on the pin shaft;

[0006] An expansion sleeve is fixedly installed between the deep groove ball bearing 1, the deep groove ball bearing 2, and the deep groove ball bearing 3;

[0007] A sealing ring structure is provided between the expansion sleeve and the deep groove ball bearing 1, the deep groove ball bearing 2 and the deep groove ball bearing 3. The sealing ring structure includes sealing ring 1, sealing ring 2 and a connecting assembly. Sealing ring 1 and sealing ring 2 are connected by the connecting assembly.

[0008] The pin has a hollow structure and a reinforcing component is provided inside the pin.

[0009] Preferably, the first sealing ring has a semi-arc structure, and a hinged connecting seat is fixedly installed at one end of the first sealing ring. The second sealing ring also has a semi-arc structure, and a hinged connecting seat is fixedly installed at one end of the second sealing ring. A sealing plug is fixedly installed on the inner arc surface of the second sealing ring.

[0010] Preferably, the connecting component includes a first connector and a second connector. The first connector is fixedly installed on the other end of the first sealing ring. A snap-fit ​​interface is provided on the arc surface of the first connector. The second connector is fixedly installed on the other end of the second sealing ring. The second connector and the first connector correspond in shape and size.

[0011] The card interface on the connector has symmetrically provided fixing holes on the inner walls of the two sides opposite each other.

[0012] The second connector has symmetrical connecting holes on both sides.

[0013] Preferably, the connecting assembly further includes a fixing snap-fit ​​ball and a spring. A spring is fixedly installed in the connecting hole on the second connector, and a fixing snap-fit ​​ball is fixedly installed on the other end of the spring.

[0014] Preferably, the hinged connecting seat on the first sealing ring and the hinged connecting seat on the second sealing ring are hinged together, and the first connecting member and the second connecting member are engaged, and the fixed engaging ball and the fixed engaging hole on the first connecting member are coaxially engaged.

[0015] Preferably, the first sealing ring and the second sealing ring are engaged to form a complete circle and are sleeved around the pin shaft. In addition, the sealing plug and the oil slinger hole are connected accordingly.

[0016] Preferably, the pin is provided with oil-throwing holes at equal intervals, and the pin is provided with oil-storing grooves at equal intervals, and the oil-throwing holes and the oil-storing grooves are connected.

[0017] Preferably, the reinforcing component includes a reinforcing rib, which is fixedly installed inside the pin. The reinforcing rib is spiral-shaped, and its outer arc surface is tightly fitted to the inner wall of the pin.

[0018] Compared with the prior art, this utility model provides a deep groove ball bearing type heavy-duty pin shaft structure, which has the following beneficial effects:

[0019] 1. This deep groove ball bearing type heavy-duty pin structure forms a multi-bearing parallel load-bearing structure by installing three (three rows of bearings) deep groove ball bearings at equal intervals on the pin. The radial load is evenly distributed by multiple rows of bearings. The introduction of the expansion sleeve eliminates the fit clearance between the bearing and the pin through axial preload, avoiding the fretting wear problem of traditional interference fit, while enhancing connection rigidity and further optimizing load transmission efficiency.

[0020] 2. The deep groove ball bearing heavy-duty pin structure has a semi-arc seal ring one and a seal ring two snapped together to form a complete ring, which fits tightly against the gap between the bearing and the expansion sleeve, preventing external dust and water from entering. The sealing plug corresponds to the oil slinger hole of the pin, preventing grease leakage. At the same time, through the design of the oil reservoir and the oil slinger hole, the grease is automatically injected into the bearing raceway due to centrifugal force when the pin rotates.

[0021] 3. This deep groove ball bearing type heavy-duty pin structure has a hollow structure that reduces the weight of the pin, making it suitable for the lightweight requirements of mobile machinery; the spiral reinforcing ribs are spirally distributed along the inner wall of the pin, and the three-dimensional structure enhances the bending stiffness, so that the pin maintains the same strength as the traditional solid shaft even when the weight is reduced. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 This is a cross-sectional view of the pin shaft of this utility model;

[0025] Figure 4 This is a schematic diagram of the explosion of the sealing ring of this utility model;

[0026] Figure 5 for Figure 4 A magnified view of part A in the diagram;

[0027] Figure 6 This is a schematic diagram of the pin shaft of this utility model.

[0028] In the diagram: 1. Deep groove ball bearing one; 2. Deep groove ball bearing two; 3. Deep groove ball bearing three; 4. Expansion sleeve; 5. Pin; 6. Reinforcing rib; 7. Seal ring one; 8. Fixed retaining ball; 9. Seal ring two; 10. Sealing plug; 11. Oil slinger hole; 12. Spring; 13. Oil reservoir; 14. Connector one; 15. Connector two. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-6 A heavy-duty pin shaft structure with deep groove ball bearings includes a deep groove ball bearing 1, a deep groove ball bearing 2, a deep groove ball bearing 3, and a pin shaft 5. The deep groove ball bearing 1, the deep groove ball bearing 2, and the deep groove ball bearing 3 are fixedly installed on the pin shaft 5 at equal intervals.

[0031] A shrink sleeve 4 is fixedly installed between deep groove ball bearing 1, deep groove ball bearing 2, and deep groove ball bearing 3.

[0032] A sealing ring structure is provided between the expansion sleeve 4 and the deep groove ball bearing 1, the deep groove ball bearing 2 and the deep groove ball bearing 3. The sealing ring structure includes sealing ring 7, sealing ring 9 and a connecting assembly. Sealing ring 7 and sealing ring 9 are connected by the connecting assembly.

[0033] The pin 5 has a hollow internal structure, and a reinforcing component is installed inside the pin 5.

[0034] Furthermore, sealing ring 7 is a semi-arc structure, and a hinged connecting seat is fixedly installed at one end of sealing ring 7. Sealing ring 9 is also a semi-arc structure, and a hinged connecting seat is fixedly installed at one end of sealing ring 9. A sealing plug 10 is fixedly installed on the inner arc surface of sealing ring 9.

[0035] Furthermore, the connecting assembly includes connector 14 and connector 2 15. Connector 14 is fixedly installed on the other end of sealing ring 1 7. A snap-fit ​​interface is provided on the arc surface of connector 14. Connector 2 15 is fixedly installed on the other end of sealing ring 2 9. Connector 2 15 and connector 14 correspond in shape and size.

[0036] The card interface on connector 14 has symmetrically provided fixing card holes on the inner walls of opposite sides.

[0037] Connecting holes are symmetrically provided on both sides of connector 2 15.

[0038] Furthermore, the connecting assembly also includes a fixed snap-fit ​​ball 8 and a spring 12. The spring 12 is fixedly installed in the connecting hole on the second connector 15, and the fixed snap-fit ​​ball 8 is fixedly installed on the other end of the spring 12.

[0039] Furthermore, the hinged connecting seat on sealing ring 1 7 and the hinged connecting seat on sealing ring 2 9 are hinged together, and connecting part 1 14 and connecting part 2 15 are engaged, and the fixed engaging ball 8 and the fixed engaging hole on connecting part 1 14 are coaxially engaged.

[0040] Furthermore, sealing ring 7 and sealing ring 9 are engaged to form a complete circle and are fitted around the pin 5. In addition, sealing plug 10 and oil slinger hole 11 are connected accordingly.

[0041] Furthermore, oil-throwing holes 11 are equidistantly provided on the pin 5, and oil storage grooves 13 are equidistantly provided inside the pin 5, and the oil-throwing holes 11 and the oil storage grooves 13 are connected.

[0042] Furthermore, the reinforcing component includes a reinforcing rib 6, which is fixedly installed inside the pin 5. The reinforcing rib 6 is spiral in shape, and the outer arc surface of the reinforcing rib 6 is tightly fitted to the inner wall of the pin 5.

[0043] Structural Description:

[0044] Deep groove ball bearing 1: As one of the main load bearings, it is installed at the front end of the pin 5. It adopts a standard deep groove ball bearing structure. Its inner ring is tightly fitted with the shrink sleeve 4, which can effectively share the radial load. The bearing is filled with special grease to ensure smooth operation.

[0045] Deep groove ball bearing 2: The structure is the same as that of deep groove ball bearing 1. It is installed in the middle of the pin 5. Through the parallel layout of multiple bearings, the overall load-bearing capacity is significantly improved.

[0046] Deep groove ball bearing 3: Installed at the end of pin 5, it forms a three-point support system together with the first two rows of bearings. The bearing sealing side adopts a thickened design, which, together with the external sealing structure, effectively prevents contaminants from entering and extends service life.

[0047] Expansion sleeve 4: A tapered sleeve structure used to fix the outer ring of pin 5. It achieves a clearance-free fit through axial clamping force, making installation and disassembly convenient and quick. It avoids the damage that may be caused by traditional interference fits and improves assembly efficiency.

[0048] Pin 5: Hollow shaft structure, made of high-strength alloy steel, with oil sling hole 11 and internal spiral reinforcing ribs 6, achieving lightweight while ensuring strength, suitable for applications requiring weight reduction;

[0049] Reinforcing rib 6: Spiral stiffener plate structure, welded and fixed to the inner wall of pin 5. The three-dimensional winding design enhances the overall rigidity, effectively resists bending deformation, and ensures the stability of pin 5 under heavy load conditions.

[0050] Sealing ring 7: a semi-circular sealing element made of wear-resistant rubber material. One end is designed with a hinged connecting seat, and the other end is provided with a connector 14, which can tightly fit the gap between the pin 5 and the expansion sleeve 4 to prevent external contaminants from entering.

[0051] Fixed snap-fit ​​ball 8: The ball-shaped connecting component achieves quick connection through the preload of spring 12. Its spherical contact design allows for a certain degree of swing, adapts to shaft deformation, and facilitates disassembly and maintenance.

[0052] Sealing ring 2 9: A semi-circular sealing element symmetrically arranged with sealing ring 1 7, with a sealing plug 10 installed on the inner arc surface, which cooperates with the oil slinger hole 11 to form a complete sealing system, which can prevent grease leakage and ensure lubrication effect.

[0053] Sealing plug 10: A cylinder installed on the inner arc surface of sealing ring 2 9, which fits tightly with oil slinger hole 11. It has oil guide grooves on its surface, which guide the grease to flow to the bearing raceway when rotating, so as to achieve continuous lubrication.

[0054] Oil throwing hole 11: An oblique through hole opened on the surface of the pin 5 for conveying grease. When the pin 5 rotates, the grease is thrown out from the oil reservoir 13 by centrifugal force to provide continuous lubrication for the bearing.

[0055] Spring 12: Compression spring 12 provides preload to the retaining ball 8, ensuring reliable sealing ring connection and maintaining stable sealing performance even under vibration conditions;

[0056] Oil reservoir 13: An annular oil reservoir located inside the pin 5, storing sufficient grease and continuously supplying oil to the bearing through the oil slinger hole 11, extending the lubrication cycle and reducing the maintenance frequency;

[0057] Connector 14: Fixed to one end of sealing ring 7, it is designed with a snap-fit ​​interface, which cooperates with connector 2 15 to achieve quick connection and ensure accurate installation and positioning of the sealing ring;

[0058] Connector 2 15: A connecting component that mates with connector 14. Symmetrical connecting holes are opened on the surface. The connecting holes have a spring 12 and a fixed retaining ball 8 inside. They cooperate with the retaining interface of connector 14 to realize the quick installation and sealing lock of the sealing ring.

[0059] Working principle: Deep groove ball bearing 1, deep groove ball bearing 2, and deep groove ball bearing 3 are equidistantly mounted on pin 5, forming a three-point support structure. The expansion sleeve 4 fixes the inner ring of the bearing to the pin 5 through axial clamping force, eliminating the fit clearance. The radial load is evenly distributed by the three rows of bearings, significantly improving the overall load-bearing capacity and avoiding single bearing overload. The clearance-free fit of the expansion sleeve 4 avoids the fretting wear of traditional interference fits, while enhancing connection rigidity and ensuring load transmission efficiency.

[0060] Sealing ring 7 and sealing ring 9 are fastened together by hinged connecting seat and connecting assembly to form a complete ring, which fits tightly against the gap between the bearing and the expansion sleeve 4. Sealing plug 10 is embedded in oil throwing hole 11 to form a dynamic seal. When the pin 5 rotates, the grease in the oil reservoir 13 is thrown out through oil throwing hole 11 under the action of centrifugal force. The oil guide groove of sealing plug 10 guides the grease to the bearing raceway. The sealing ring prevents external dust, water and other contaminants from entering the bearing and extends its service life. The automatic lubrication system achieves continuous oil supply through oil throwing hole 11 and oil reservoir 13, reducing maintenance frequency and avoiding dry friction of the bearing.

[0061] The pin 5 has a hollow structure with a spiral reinforcing rib 6 welded inside, which fits tightly against the inner wall of the pin. The hollow design greatly reduces weight and is suitable for the lightweight requirements of mobile machinery. The spiral reinforcing rib 6 enhances bending stiffness through three-dimensional winding, so that the pin still maintains the same strength as the traditional solid shaft after weight reduction, resisting heavy load deformation.

[0062] When the pin 5 rotates, the centrifugal force causes the grease in the oil reservoir 13 to be thrown out through the oil throwing hole 11. The sealing plug 10 guides the grease to flow to the bearing raceway while dynamically sealing. The sealing ring structure prevents grease leakage and contaminants from entering in the reverse direction.

[0063] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A deep groove ball bearing type heavy-duty pin structure, characterized in that: include: Deep groove ball bearing 1 (1), deep groove ball bearing 2 (2), deep groove ball bearing 3 (3), and pin (5), wherein the deep groove ball bearing 1 (1), the deep groove ball bearing 2 (2), and the deep groove ball bearing 3 (3) are fixedly installed at equal intervals on the pin (5); An expansion sleeve (4) is fixedly installed between the deep groove ball bearing one (1), the deep groove ball bearing two (2), and the deep groove ball bearing three (3). A sealing ring structure is provided between the expansion sleeve (4) and the deep groove ball bearing one (1), the deep groove ball bearing two (2) and the deep groove ball bearing three (3). The sealing ring structure includes a sealing ring one (7), a sealing ring two (9) and a connecting assembly. The sealing ring one (7) and the sealing ring two (9) are connected by the connecting assembly. The pin (5) has a hollow structure inside, and a reinforcing component is provided inside the pin (5).

2. The deep groove ball bearing type heavy-duty pin structure according to claim 1, characterized in that: The sealing ring one (7) has a semi-arc structure, and a hinged connecting seat is fixedly installed at one end of the sealing ring one (7). The sealing ring two (9) also has a semi-arc structure, and a hinged connecting seat is fixedly installed at one end of the sealing ring two (9). A sealing plug (10) is fixedly installed on the inner arc surface of the sealing ring two (9).

3. The deep groove ball bearing type heavy-duty pin structure according to claim 2, characterized in that: The connecting assembly includes connector one (14) and connector two (15). Connector one (14) is fixedly installed on the other end of the sealing ring one (7). A card interface is opened on the arc surface of connector one (14). Connector two (15) is fixedly installed on the other end of the sealing ring two (9). Connector two (15) and connector one (14) correspond in shape and size. Fixed locking holes are symmetrically provided on the inner walls of the card interface on both sides of the connector (14). The connector 2 (15) has symmetrical connecting holes on both sides.

4. The deep groove ball bearing type heavy-duty pin structure according to claim 3, characterized in that: The connecting assembly also includes a fixed snap-fit ​​ball (8) and a spring (12). The spring (12) is fixedly installed in the connecting hole on the second connector (15), and the fixed snap-fit ​​ball (8) is fixedly installed on the other end of the spring (12).

5. The deep groove ball bearing type heavy-duty pin shaft structure according to claim 4, characterized in that: The hinged connecting seat on the sealing ring one (7) and the hinged connecting seat on the sealing ring two (9) are hinged together, and the connecting part one (14) and the connecting part two (15) are engaged. The fixed engaging ball (8) and the fixed engaging hole on the connecting part one (14) are coaxially engaged.

6. The deep groove ball bearing type heavy-duty pin structure according to claim 2, characterized in that: Oil-throwing holes (11) are provided at equal intervals on the pin (5), and oil storage grooves (13) are provided at equal intervals inside the pin (5), and the oil-throwing holes (11) and the oil storage grooves (13) are connected.

7. The deep groove ball bearing type heavy-duty pin structure according to claim 6, characterized in that: The sealing ring 1 (7) and the sealing ring 2 (9) are engaged to form a complete circle and are fitted around the pin (5). In addition, the sealing plug (10) and the oil slinger hole (11) are connected accordingly.

8. The deep groove ball bearing type heavy-duty pin structure according to claim 1, characterized in that: The reinforcing component includes a reinforcing rib (6), which is fixedly installed inside the pin (5). The reinforcing rib (6) is spiral in shape, and the outer arc surface of the reinforcing rib (6) is tightly fitted to the inner wall of the pin (5).

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