Sealed radial spherical bearings for hydraulic cylinders

Abstract

This utility model discloses a sealed radial spherical bearing for hydraulic cylinders, comprising an outer ring and an inner ring with an arc-shaped mating surface between them. The outer ring has an annular groove on its inner wall, within which balls are placed, contacting the surface of the inner ring to reduce friction between them. An oil inlet channel is provided within the outer ring, communicating with the groove for lubricating the balls. The oil inlet channel contains a limiting seat, a valve body, and a limiting groove. The limiting seat has an oil passage hole, and the valve body moves through it, its bottom resting within the limiting groove. The limiting groove and valve body abut against each other to form a sealing structure. A spring is provided between the limiting seat and the valve body, causing the valve body to reset, thus achieving unidirectional oil flow in the inlet channel, reducing friction between the outer and inner rings, and extending the bearing's service life.

Description

Technical Field

[0001] This utility model belongs to the field of bearing technology, and in particular relates to a sealed radial joint bearing for hydraulic cylinders. Background Technology

[0002] Sealed radial spherical bearings for hydraulic cylinders are mainly used in the hinge joints between hydraulic cylinders and robotic arms in engineering machinery and similar mechanisms. They are key components for the hinged transmission of hydraulic cylinders and robotic arms in engineering machinery. Because the products often operate under harsh conditions such as low speed, heavy load, and dust, the requirements for lubrication performance and reliability of the products are high. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned technical problems existing in the prior art and to provide a sealed radial joint bearing for hydraulic cylinders, thereby effectively reducing the internal friction of the bearing.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] The hydraulic cylinder uses a sealed radial spherical plain bearing, which has an outer ring and an inner ring, with an arc-shaped mating surface between them. It also includes an annular groove on the inner wall of the outer ring, with balls inside the groove. The balls contact the surface of the inner ring to reduce friction between the outer and inner rings. The outer ring has an oil inlet channel that communicates with the groove to lubricate the balls.

[0006] Furthermore, the oil inlet channel is equipped with a limit seat, a valve body, and a limit groove;

[0007] The limit seat is provided with an oil passage hole, the valve body moves through the limit seat and is located in the limit groove at the bottom. The limit groove and the valve body abut against each other to form a sealing structure. A spring is provided between the limit seat and the valve body. The spring drives the valve body to reset, so as to realize the unidirectional flow of oil in the inlet channel.

[0008] Furthermore, a connecting ring is provided outside the valve body, and a connecting seat is connected to the top of the valve body through an external thread. The connecting seat abuts against the connecting ring, and the two ends of the spring are respectively connected to the connecting ring and the limiting seat. The clamping force of the valve body is adjusted by changing the elastic force of the spring.

[0009] Furthermore, the outer ring is composed of two semi-circular outer rings, and connecting rods and connecting holes are respectively provided on the opposite surfaces of the two semi-circular outer rings. The connecting rods and connecting holes are connected to achieve the installation of the outer ring.

[0010] Furthermore, the oil inlet channel is located on the mating surface of at least one semi-circular outer ring, and is formed by the mating of the two semi-circular outer rings.

[0011] Furthermore, a bushing is provided on the outer ring, with a limiting ring at one end and a groove at the other end. A retaining ring is provided in the groove, and the outer ring is fixed by the limiting ring and the retaining ring.

[0012] Furthermore, a self-lubricating material is provided between the outer ring and the bushing.

[0013] Furthermore, the self-lubricating material is PTFE woven fabric.

[0014] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0015] 1. In this utility model, the friction between the outer ring and the inner ring is reduced by setting the annular groove and the ball. At the same time, lubricating oil is injected into the annular groove through the oil inlet channel to improve the lubrication effect, reduce the friction in the bearing, and extend the service life of the bearing.

[0016] 2. In this utility model, the valve body and spring are designed to enable unidirectional flow of lubricating oil in the oil inlet channel, thereby preventing lubricating oil leakage.

[0017] 3. In this utility model, by changing the position of the connecting seat on the valve body, the spring can be compressed or released, thereby changing the preload force applied by the spring to the valve body, so as to adjust the clamping force of the valve body on the limiting groove and improve the practicality of the bearing. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the sealed radial spherical bearing for hydraulic cylinders according to this utility model;

[0020] Figure 2 This is a three-dimensional structural diagram of the outer ring in this utility model;

[0021] Figure 3 for Figure 1 Enlarged schematic diagram of a local structure at point A;

[0022] Figure 4 for Figure 3 Enlarged schematic diagram of the local structure at point B.

[0023] In the diagram: 1-Outer ring; 2-Inner ring; 3-Annular groove; 4-Ball; 5-Oil inlet channel; 6-Limit seat; 7-Valve body; 8-Limit groove; 9-Oil passage hole; 10-Spring; 11-Connecting ring; 12-Connecting seat; 13-Semi-circular outer ring; 14-Connecting rod; 15-Connecting hole; 16-Shaft sleeve; 17-Limit ring; 18-Groove; 19-Retaining ring; 20-Self-lubricating material. Detailed Implementation

[0024] Example 1:

[0025] like Figures 1 to 2As shown, this utility model is a sealed radial spherical bearing for a hydraulic cylinder. It has an outer ring 1 and an inner ring 2, with an arc-shaped mating surface between the inner ring 2 and the outer ring 1. It also includes an annular groove 3 on the inner wall of the outer ring 1, with balls 4 inside the groove. The balls 4 are in contact with the surface of the inner ring 2 to reduce the friction between the outer ring 1 and the inner ring 2. An oil inlet channel 5 is provided inside the outer ring 1, which is connected to the groove to lubricate the balls 4.

[0026] An arc-shaped mating surface is formed between the inner ring 2 and the outer ring 1 to enable the joint to swing. In order to reduce the friction between the outer ring 1 and the inner ring 2 during relative movement, an annular groove 3 is machined on the inner wall of the outer ring 1. Several balls 4 are placed in the annular groove 3. The balls 4 are in direct contact with the outer surface of the inner ring 2, converting sliding friction into rolling friction.

[0027] To achieve continuous lubrication of the balls 4, an oil inlet channel 5 is provided inside the outer ring 1. The outlet end of the oil inlet channel 5 is connected to the annular groove 3. When lubricating oil is injected from the inlet of the oil inlet channel 5, the oil can flow into the annular groove 3 to lubricate the balls 4 in the annular groove 3, reduce the wear of the balls 4 and extend their service life.

[0028] Example 2:

[0029] like Figures 3 to 4 As shown, based on Example 1, this example implements a specific flow-limiting structure within the oil inlet channel 5.

[0030] The oil inlet channel 5 is provided with a limiting seat 6, a valve body 7 and a limiting groove 8; the limiting seat 6 is provided with several oil passage holes 9, the valve body 7 moves through the limiting seat 6 and is located in the limiting groove 8 at the bottom, the limiting groove 8 and the valve body 7 abut against each other to form a sealing structure, and a spring 10 is provided between the limiting seat 6 and the valve body 7, the spring 10 drives the valve body 7 to reset, so as to realize the unidirectional flow of the oil inlet channel 5.

[0031] The oil inlet channel 5 is equipped with a limit seat 6, a valve body 7 and a limit groove 8. The limit seat 6 is fixedly installed in the channel and has an oil passage hole 9 to realize the flow of lubricating oil.

[0032] The valve body 7 is slidably installed in the limiting seat 6; the bottom of the valve body 7 is set in the limiting groove 8 and closely abuts against the contact surface of the limiting groove 8 to form a sealing structure and prevent the oil from flowing backward.

[0033] A spring 10 is installed between the limit seat 6 and the valve body 7. Under normal conditions, the spring 10 drives the bottom of the valve body 7 to abut against the limit groove 8 to maintain a sealed state. When lubricating oil is injected, when the lubricating oil pressure reaches a certain value, the oil pressure overcomes the elastic force of the spring 10 and pushes the valve body 7 to move closer to the inner ring 2. At the same time, a gap is generated between the limit groove 8 and the valve body 7, and the lubricating oil can flow from the oil inlet hole and the gap into the groove. After the oil pressure drops, the spring 10 drives the valve body 7 to reset and reseal the limit groove 8, thereby realizing the unidirectional flow function of the oil inlet channel 5.

[0034] Example 3:

[0035] like Figures 3 to 4 As shown, based on Example 2, this example implements the valve body 7 adjustment structure in detail.

[0036] A connecting ring 11 is provided on the outside of the valve body 7. A connecting seat 12 is connected to the top of the valve body 7 by an external thread. The connecting seat 12 abuts against the connecting ring 11. The two ends of the spring 10 are respectively connected to the connecting ring 11 and the limiting seat 6. The clamping force of the valve body 7 is adjusted by changing the elastic force of the spring 10.

[0037] A connecting ring 11 is fixedly sleeved on the outer wall of the valve body 7. The top outer wall of the valve body 7 is machined with an external thread, and a connecting seat 12 is screwed through the external thread. By tightening or loosening the connecting seat 12, it can be moved down or up along the valve body 7. At the same time, the lower end face of the connecting seat 12 abuts against the upper end face of the connecting ring 11.

[0038] The upper end of the spring 10 is fixedly connected to the lower surface of the connecting ring 11, and the lower end of the spring 10 is fixedly connected to the upper surface of the limiting seat 6. By turning the connecting seat 12 to change its height position, the spring 10 can be compressed or released, thereby changing the preload force applied by the spring 10 to the valve body 7, so as to adjust the clamping force of the valve body 7 on the limiting groove 8.

[0039] Example 4:

[0040] like Figure 2 As shown, based on Example 1, this example implements the mounting structure of the outer ring 1 in detail.

[0041] The outer ring 1 is composed of two semi-circular outer rings 13. The two semi-circular outer rings 13 are respectively provided with connecting rods 14 and connecting holes 15 on their opposite surfaces. The connecting rods 14 and connecting holes 15 are connected to each other to realize the installation of the outer ring 1.

[0042] The outer ring 1 is composed of two symmetrical semicircular outer rings 13 joined together. A connecting rod 14 is machined on the mating surface of the two semicircular outer rings 13, and a connecting hole 15 is machined on the corresponding position of the other semicircular outer ring 13. During installation, the two semicircular outer rings 13 are aligned and the connecting rod 14 is inserted into the corresponding connecting hole 15, so that the two semicircular outer rings 13 can be reliably connected and the assembly of the entire outer ring 1 is completed.

[0043] Example 5:

[0044] like Figure 2 As shown, based on Example 4, this example specifically implements the processing position of the oil inlet channel 5.

[0045] The oil inlet channel 5 is provided on the mating surface of at least one semi-circular outer ring 13, and is formed by the mating of the two semi-circular outer rings 13.

[0046] The oil inlet channel 5 is preferably located on the mating surface of at least one of the semicircular outer rings 13 (i.e., the mating surface of the two semicircular outer rings 13). Specifically, a groove is machined on the mating surface of one of the semicircular outer rings 13, and a matching groove is also machined on the corresponding mating surface of the other semicircular outer ring 13. When the two semicircular outer rings 13 are assembled and installed through the connecting rod 14 and the connecting hole 15, the two grooves fit together perfectly to form a complete oil inlet channel 5.

[0047] The position of the connecting seat 12 in the oil inlet channel 5 can be easily adjusted by disassembling the outer ring 1.

[0048] Example 6:

[0049] like Figure 1 As shown, based on Embodiment 1, this embodiment implements a specific method for fixing the outer ring 1.

[0050] The outer ring 1 is provided with a bushing 16. One end of the bushing 16 is provided with a limiting ring 17, and the other end is provided with a groove 18. A retaining ring 19 is provided in the groove 18. The outer ring 1 is fixed by the limiting ring 17 and the retaining ring 19.

[0051] A bushing 16 is fitted around the outer ring 1. A limiting ring 17 protruding inward is machined on the inner wall of one end of the bushing 16, and an annular groove 18 is machined on the inner wall of the other end of the bushing 16. A retaining ring 19 is installed in the annular groove 18. During assembly, the assembled outer ring 1 is placed into the bushing 16, so that one end of it abuts against the limiting ring 17 of the bushing 16, and the other end is limited by the retaining ring 19 installed in the groove 18. The axial fixation of the outer ring 1 in the bushing 16 is achieved by the limiting ring 17 and the retaining ring 19.

[0052] Example 7:

[0053] like Figure 1 As shown, based on Example 6, this example provides a specific implementation of the lubrication between the bushing 16 and the outer ring 1.

[0054] A self-lubricating material 20 is provided between the outer ring 1 and the bushing 16.

[0055] To reduce friction between the bushing 16 and the outer surface of the outer ring 1, 20 layers of self-lubricating material are filled between the outer wall of the outer ring 1 and the inner wall of the bushing 16.

[0056] Example 8:

[0057] like Figure 1 As shown, based on Example 7, this example specifically defines the type of self-lubricating material 20.

[0058] The self-lubricating material 20, located between the outer ring 1 and the bushing 16, is a polytetrafluoroethylene (PTFE) braided fabric. The PTFE braided fabric achieves self-lubrication by forming a solid lubricating film through low-resistance slippage of molecular chains and transfer to the mating surfaces. Its braided structure stores wear debris and maintains the transferred film, achieving long-lasting, oil-free lubrication.

[0059] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A sealed radial spherical plain bearing for a hydraulic cylinder, comprising an outer ring and an inner ring, wherein the inner ring and the outer ring have an arc-shaped mating surface, characterized in that... Also includes: The outer ring has an annular groove on its inner wall, and a ball is provided in the groove. The ball contacts the surface of the inner ring to reduce the friction between the outer ring and the inner ring. The outer ring is provided with an oil inlet channel, which is connected to the roller groove for lubricating the ball.

2. The sealed radial spherical plain bearing for hydraulic cylinders according to claim 1, characterized in that: The oil inlet channel is equipped with a limit seat, a valve body, and a limit groove; The limiting seat is provided with an oil passage hole, the valve body moves through the limiting seat and is located at the bottom in the limiting groove. The limiting groove and the valve body abut against each other to form a sealing structure. A spring is provided between the limiting seat and the valve body. The valve body is reset by the spring to realize the unidirectional flow of the oil inlet channel.

3. The sealed radial spherical plain bearing for hydraulic cylinders according to claim 2, characterized in that: The valve body is provided with a connecting ring, and the top of the valve body is connected to a connecting seat through an external thread. The connecting seat abuts against the connecting ring. The two ends of the spring are respectively connected to the connecting ring and the limiting seat. The clamping force of the valve body is adjusted by changing the elastic force of the spring.

4. The sealed radial spherical plain bearing for hydraulic cylinders according to claim 1, characterized in that: The outer ring is composed of two semi-circular outer rings. The two semi-circular outer rings are respectively provided with connecting rods and connecting holes on their opposite surfaces. The connecting rods and connecting holes are connected to achieve the installation of the outer ring.

5. The sealed radial spherical plain bearing for hydraulic cylinders according to claim 4, characterized in that: The oil inlet channel is located on the mating surface of at least one of the semicircular outer rings and is formed by the mating of the semicircular outer rings on both sides.

6. The sealed radial spherical plain bearing for hydraulic cylinders according to claim 1, characterized in that: The outer ring is provided with a bushing, one end of which is provided with a limiting ring and the other end is provided with a groove. A retaining ring is provided in the groove. The outer ring is fixed by the limiting ring and the retaining ring.

7. The sealed radial spherical plain bearing for hydraulic cylinders according to claim 6, characterized in that: A self-lubricating material is provided between the outer ring and the bushing.

8. The sealed radial spherical plain bearing for hydraulic cylinders according to claim 7, characterized in that: The self-lubricating material is PTFE woven fabric.

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