A bearing integrating linear motion and multi-dimension centering functions

Abstract

The utility model discloses a bearing of linear motion and multidimensional alignment function is integrated in one, including the coaxial setting outer ring and inner ring, the outer ring and the both sides of inner ring are provided with special-shaped rubber cylinder, the both ends of special-shaped rubber cylinder are connected with the end face of outer ring and the lateral wall of inner ring respectively, form the oil storage cavity, be provided with oil channel on the outer ring, be provided with sealing plug in the oil channel, the inner wall of inner ring is movably provided with retainer, be provided with roller in the retainer. Adopt integrated design, the alignment function module of outer ring, inner ring, special-shaped rubber cylinder, oil channel and sealing plug are composed and the linear motion module of inner ring, roller and retainer are composed, realize the integrated coupling of joint alignment module and linear motion module through the common inner ring, has promoted the space utilization efficiency and motion cooperativity, solved the technical problem that single linear bearing or joint bearing cannot satisfy the demand in composite field motion.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical transmission and motion control, and relates to a bearing, specifically a bearing that integrates linear motion and multi-dimensional self-aligning function. Background Technology

[0002] In the field of mechanical transmission and motion control, bearings, as core functional components, directly affect the motion accuracy, load-bearing capacity, and environmental adaptability of equipment. With the rapid development of industrial automation, robotics, and high-end equipment, the functional requirements for bearings are becoming increasingly complex. In particular, traditional bearing technology faces significant limitations in complex motion scenarios that require simultaneous linear motion and multi-directional self-aligning.

[0003] Currently, for applications requiring both linear motion and multi-directional self-alignment (such as robotic arm end effectors, multi-degree-of-freedom hydraulic actuators, and complex trajectory machining equipment), the conventional approach is to use linear bearings and spherical bearings in series or parallel. For example, spherical bearings are connected in series at the rear end of the linear motion module to compensate for angular deviations. However, this split design has the following problems:

[0004] Structural redundancy: The stacking of multiple bearings leads to an increase in axial dimensions and low space utilization;

[0005] Motion interference: The fit clearance between the split bearings can easily cause vibration or response lag;

[0006] High maintenance costs: Multiple components require independent lubrication and replacement. Manual lubrication requires stopping the machine and disassembling the bearings, which is difficult to implement in complex scenarios. Repeated disassembly causes micro-wear on the mating surfaces, increasing the complexity of operation and maintenance.

[0007] Performance bottleneck: It is difficult to optimize linear motion and self-aligning function in a coordinated manner, resulting in a decrease in overall load-bearing efficiency.

[0008] Insufficient lubrication continuity: Conventional grease chambers have limited capacity, and under continuous oscillation, grease is easily squeezed out and subjected to secondary friction, leading to boundary lubrication failure.

[0009] In existing technologies, the functional inconsistency between linear bearings and spherical plain bearings leads to the following core problems in complex motion scenarios:

[0010] Functional limitation: linear bearings lack self-aligning capability, and spherical plain bearings cannot achieve efficient linear motion;

[0011] Low integration: The modular solution has a bulky structure, making it difficult to meet the requirements of compact and lightweight equipment;

[0012] Insufficient lifespan and reliability: The split design exacerbates the risk of wear, and the mixed mechanism of sliding friction and rolling friction further reduces system stability;

[0013] Costs and maintenance burdens: The costs of purchasing, installing and maintaining multiple components have increased significantly.

[0014] Lubrication and maintenance are difficult: self-lubricating and single oil chambers have obvious defects under heavy load, high frequency oscillation or extreme environment (high and low temperature, vacuum, dust) conditions. Utility Model Content

[0015] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a bearing that integrates linear motion and multi-dimensional self-aligning function, so as to solve the technical problem that a single linear bearing or spherical bearing cannot meet the needs of complex field motion.

[0016] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0017] A bearing integrating linear motion and multi-dimensional self-aligning function includes an outer ring and an inner ring arranged coaxially; both sides of the outer ring and the inner ring are provided with irregularly shaped rubber cylinders, and the two ends of the irregularly shaped rubber cylinders are respectively connected to the end face of the outer ring and the side wall of the inner ring to form an oil storage cavity;

[0018] An oil passage is provided on the outer ring, and a sealing plug is provided in the oil passage;

[0019] A retainer is movably disposed on the inner wall of the inner ring, and a roller is disposed in the retainer.

[0020] This utility model also includes the following technical features:

[0021] The inner wall of the outer ring is provided with a pair of symmetrically distributed threaded oil grooves, and each threaded oil groove has an oil inlet hole at its end, which is connected to the corresponding oil storage cavity.

[0022] The angle between the threaded oil groove and the inner wall of the outer ring is 25°.

[0023] The inner ring has slots on both sides of its inner wall, and lip-shaped sealing rings are installed in the slots.

[0024] The lip seal ring and the inner ring are interference fit.

[0025] A trapezoidal cross-section sealing groove is provided on the end face of the outer ring, and one end of the irregular rubber cylinder is disposed in the trapezoidal cross-section sealing groove.

[0026] The inner surface of the outer ring has a concave raceway shaped like a spherical crown, and the outer surface of the inner ring has a convex spherical raceway; the two are fitted with a clearance.

[0027] Compared with the prior art, the beneficial technical effects of this utility model are:

[0028] (I) The bearing in this utility model adopts an integrated design, consisting of an outer ring, an inner ring, a shaped rubber cylinder, an oil passage and a sealing plug forming a self-aligning functional module, and an inner ring, a roller and a cage forming a linear motion module. By sharing an inner ring, the joint self-aligning module and the linear motion module are integrated and coupled, which improves space utilization efficiency and motion coordination, and solves the technical problem that a single linear bearing or joint bearing cannot meet the needs of complex field motion.

[0029] (II) The outer ring of this utility model is provided with symmetrical oil storage chambers on both sides, which serve to store oil and supply oil to the threaded oil groove, so as to facilitate the mutual circulation and replenishment of the internal and external lubricating grease of the bearing; it realizes self-lubrication and dustproof performance, ensures lubrication of the bearing during operation, and realizes maintenance-free function during the working life. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the present invention;

[0031] Figure 2 for Figure 1 Enlarged view of point A in the image;

[0032] Figure 3 for Figure 1 Enlarged view of point B in the image;

[0033] Figure 4 This is a three-dimensional structural diagram of the present invention.

[0034] The meanings of the labels in the diagram are as follows: outer ring 1, inner ring 2, roller 3, cage 4, irregular rubber cylinder 5, lip seal 6, oil passage 7, sealing plug 8, trapezoidal section sealing groove 9, slot 10, threaded oil groove 11, oil inlet hole 12.

[0035] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, all components in this utility model are components known in the art.

[0037] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0038] This utility model provides a bearing that integrates linear motion and multi-dimensional self-aligning function, including an outer ring 1 and an inner ring 2 arranged coaxially; both sides of the outer ring 1 and the inner ring 2 are provided with irregularly shaped rubber cylinders 5, and the two ends of the irregularly shaped rubber cylinders 5 are respectively connected to the end face of the outer ring 1 and the side wall of the inner ring 2 to form an oil storage cavity.

[0039] An oil passage 7 is provided on the outer ring 1, and a sealing plug 8 is provided in the oil passage 7;

[0040] A retainer 4 is movably mounted on the inner wall of the inner ring 2, and a roller 3 is mounted in the retainer 4.

[0041] In the above technical solution, the bearing adopts an integrated design, with a self-aligning functional module consisting of an outer ring 1, an inner ring 2, a shaped rubber cylinder 5, an oil passage 7, and a sealing plug 8, and a linear motion module consisting of an inner ring 2, a roller 3, and a cage 4. The integrated coupling of the joint self-aligning module and the linear motion module is achieved by sharing the inner ring 2, which improves space utilization efficiency and motion coordination, and solves the technical problem that a single linear bearing or joint bearing cannot meet the needs of complex field motion.

[0042] Secondly, symmetrical oil reservoirs are provided on both sides of the outer ring, which serve to store oil and supply oil to the threaded oil groove, facilitating the mutual flow and replenishment of grease between the inside and outside of the bearing; achieving self-lubrication and dustproof performance, ensuring lubrication of the bearing during operation, and achieving maintenance-free function within its working life.

[0043] The outer ring 1 adopts an asymmetric elliptical cross-section design, with its major semi-axis forming an interference fit with the mating hole, and a slight clearance reserved in the direction of the minor semi-axis. During assembly, an axial pressure of 120-150MPa is applied by a hydraulic press, causing the outer ring to undergo controllable plastic deformation in the mating hole, forming a "creep locking" effect, which has advantages such as long-term anti-loosening, improved load-bearing capacity, and extended fatigue life;

[0044] The inner ring 2 is made of high carbon chromium bearing steel (GCr15) and quenched, and the inner diameter raceway surface is ultra-precision ground; the roller 3 is made of GCr15 precision bearing steel ball and the surface is mirror polished; the cage 4 is made of glass fiber reinforced plastic integral injection molding, which takes into account high strength, high temperature resistance and lightweight, and is designed with an equally divided ball pocket structure. The cage window is designed with arc precision grinding through the beam to reduce friction torque. After the cage 4 is assembled with the roller, it adopts hot pressing interference fit to ensure the initial preload of the moving pair, which can realize low friction and high rigidity linear motion.

[0045] The irregularly shaped rubber cylinder 5 is made of silicone rubber. Silicone rubber has a wide hardness range and high flexibility can be achieved through formula adjustment. The overall design is in the shape of "3". When the bearing is self-aligning, the concave part in the middle can release the margin to adapt to complex motion deformation and allow the joint bearing to swing to the limit. The long-term operating temperature is -60℃ to 230℃, covering the range of bearing motion heat generation. It also has a low coefficient of friction and anti-aging properties.

[0046] The end face of the oil passage 7 is mirror-polished and fitted with a three-lip seal plug made of fluororubber, achieving IP67-level sealing protection through interference fit. Under normal operating conditions, this structure meets the maintenance-free requirement of L10 life cycle specified by ISO 281 standard. In the event of extreme conditions such as heavy contamination or abnormal temperature rise, the removable seal plug can be injected with grease to achieve emergency relubrication.

[0047] This utility model also includes the following technical features:

[0048] A pair of symmetrically distributed threaded oil grooves 11 are provided on the inner wall of the outer ring 1. Each threaded oil groove 11 has an oil inlet hole 12 at its end, and the oil inlet hole 12 is connected to the corresponding oil storage cavity.

[0049] In the above technical solution, when lubricating grease is injected through the oil inlet 12 or the oil passage 7, the surface roughness of the friction surfaces between the threaded oil groove 11 and the outer ring 1 and the inner ring 2 forms a continuous oil film. The main function of this continuous oil film is to reduce friction and wear, while also providing cooling and vibration absorption. This arrangement achieves a uniform grease distribution function, helping the lubricating grease to fully lubricate the sliding motion.

[0050] The angle between the threaded oil groove 11 and the inner wall of the outer ring 1 is 25°.

[0051] In the above technical solution, when the included angle between the two is 25°, the flow rate of the lubricating grease is better and the lubrication effect is better.

[0052] The inner ring 2 has grooves 10 on both sides of its inner wall, and lip-shaped sealing rings 6 are provided in the grooves 10.

[0053] In the above technical solution, the lip seal 6 can maintain geometric accuracy under high pressure conditions, prevent leakage caused by deformation during self-aligning movements, and is embedded in the groove 10 of the inner ring 2 to prevent it from falling out.

[0054] Preferably, the lip seal 6 adopts a skeleton structure, which can enhance the strength of the seal and improve its resistance to deformation. The metal skeleton provides rigid support for the rubber, preventing the seal from twisting or permanently deforming under high temperature and pressure or during installation. It also has the functions of impact resistance, assisting installation, and fixation.

[0055] The lip seal 6 and the inner ring 2 are interference fit.

[0056] In the above technical solution, the two are fitted with an interference fit, which can effectively prevent particulate impurities and dust from entering, keep the lip of the lip seal 6 in contact with the external mandrel, and increase the sealing performance.

[0057] A trapezoidal cross-section sealing groove 9 is provided on the end face of the outer ring 1, and one end of the irregular rubber cylinder 5 is fixedly installed in the trapezoidal cross-section sealing groove 9.

[0058] In the above technical solution, the two ends of the irregular rubber cylinder 5 are connected to the end face of the outer ring 1 and the side wall of the inner ring 2, respectively. The connection with the inner ring 2 is a contact connection, and the connection with the trapezoidal section sealing groove 9 of the outer ring 1 is a fixed connection.

[0059] The outer ring 1 has a trapezoidal cross-section sealing groove 9 on its end face, and the bottom of the groove is designed with an anchoring tooth pattern array. The irregular rubber cylinder 5 is made of fluororubber material for injection molding connection. The surface of the injection molded part is treated with diamond knurling to form a micro-texture structure. The injection molding anchoring tooth pattern makes the bonding strength between the outer ring 1 and the irregular rubber cylinder 5 reach 15Mpa, which is 300% higher than the pull-out resistance of the traditional snap-fit ​​installation. The knurled surface, in conjunction with the bearing seat, can effectively distribute the axial load. The irregular rubber cylinder 5 and the inner ring 2 are contact seals with high sealing performance, which can effectively prevent contamination and retain lubricant, and adapt to complex working conditions.

[0060] The inner surface of the outer ring 1 has a concave raceway shaped like a spherical crown, and the outer surface of the inner ring 2 has a convex spherical raceway. The two are fitted with a clearance fit.

[0061] In the above technical solution, both motion flexibility and load-bearing stability are taken into account. Through the conformal matching of the spherical pair, the inner and outer rings can achieve ±20° swing compensation in the radial plane to realize multi-dimensional self-alignment.

Claims

1. A bearing integrating linear motion and multi-dimensional self-aligning functions, characterized in that, It includes an outer ring (1) and an inner ring (2) arranged coaxially; both sides of the outer ring (1) and the inner ring (2) are provided with irregular rubber cylinders (5), and the two ends of the irregular rubber cylinders (5) are respectively connected to the end face of the outer ring (1) and the side wall of the inner ring (2) to form an oil storage cavity; An oil passage (7) is provided on the outer ring (1), and a sealing plug (8) is provided in the oil passage (7); A retainer (4) is movably provided on the inner wall of the inner ring (2), and a roller (3) is provided in the retainer (4).

2. The bearing as described in claim 1, which integrates linear motion and multi-dimensional self-aligning functions, is characterized in that... The inner wall of the outer ring (1) is provided with a pair of symmetrically distributed threaded oil grooves (11), and each threaded oil groove (11) has an oil inlet hole (12) at its end, and the oil inlet hole (12) is connected to the corresponding oil storage cavity.

3. The bearing as described in claim 2, which integrates linear motion and multi-dimensional self-aligning functions, is characterized in that... The angle between the threaded oil groove (11) and the inner wall of the outer ring (1) is 25°.

4. The bearing as described in claim 1, which integrates linear motion and multi-dimensional self-aligning functions, is characterized in that... The inner ring (2) has slots (10) on both sides of its inner wall, and a lip seal (6) is provided in the slots (10).

5. The bearing as described in claim 4, which integrates linear motion and multi-dimensional self-aligning functions, is characterized in that... The lip seal (6) and the inner ring (2) are interference fit.

6. The bearing as described in claim 1, which integrates linear motion and multi-dimensional self-aligning functions, is characterized in that... A trapezoidal cross-section sealing groove (9) is provided on the end face of the outer ring (1), and one end of the irregular rubber cylinder (5) is provided in the trapezoidal cross-section sealing groove (9).

7. The bearing as described in claim 1, which integrates linear motion and multi-dimensional self-aligning functions, is characterized in that... The inner surface of the outer ring (1) is a concave raceway in the shape of a spherical crown, and the outer surface of the inner ring (2) is a convex spherical raceway. The two are fitted with a clearance.

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