Sealing method for metal joints in hinge device of low-floor vehicle

Abstract

The invention discloses a sealing method for a metal joint in a hinge device of a low-floor vehicle, the metal joint comprises a metal joint outer seat sleeve, an outer rolling ball sleeve arranged in the metal joint outer seat sleeve and an inner limiting block arranged in the outer rolling ball sleeve, and the outer rolling ball sleeve and the inner limiting block are in spherical surface contact. According to the sealing method, a first wear-resisting ball sleeve is vulcanized in a metal joint outer seat sleeve through rubber, the first wear-resisting ball sleeve makes spherical contact with an outer rolling ball sleeve, a rubber sealing ring is arranged on the rubber close to the top of the metal joint outer seat sleeve, and the rubber sealing ring and the rubber are integrally vulcanized and formed. When the inner limiting block is locked on the metal joint outer seat sleeve through a bolt to enable the inner limiting block, the outer rolling ball sleeve, the first abrasion-resistant ball sleeve and the metal joint outer seat sleeve to form the metal joint, the outer rolling ball sleeve makes contact with the rubber sealing ring to form a first sealing structure to seal the interior of the metal joint. According to the metal joint, external sundries can be better prevented from entering the interior of the metal joint.

Description

Technical Field

[0001] The invention relates to a sealing method, in particular to a sealing method for metal joints in an articulated device of a low-floor vehicle, and belongs to the technical field of manufacturing articulated devices of low-floor vehicles. Background Art

[0002] Low-floor light rail vehicles, hereinafter referred to as low-floor vehicles, are new types of modern urban transportation equipment. They are generally composed of three, five or seven vehicles, connected by an articulated system, and the vehicle is less than 40 cm from the track surface. The vehicle body articulation device is an important part of the vehicle body connection of urban low-floor vehicles. At present, with the widespread application of low-floor vehicles in Europe, they are also being promoted in China, so the market demand for articulated devices is also increasing.

[0003] The body articulation device is arranged at the connecting parts at both ends of the body, generally adopting the cooperation mode of upper and lower hinge supports. Its main function is to connect multiple low-floor carriages, while meeting the vehicle's traction and braking force transmission requirements, and adapting to the needs of the vehicle passing through small-radius horizontal and vertical curves in urban traffic.

[0004] A Chinese invention patent application with application publication number CN105822665A and application publication date August 3, 2016 discloses an integral metal joint bearing in a fixed hinge of a low-floor vehicle, comprising a metal joint outer seat sleeve, an outer rolling ball sleeve arranged inside the metal joint outer seat sleeve, an inner rolling ball arranged inside the outer rolling ball sleeve, and a wear-resistant bushing 1 arranged between the metal joint outer seat sleeve and the outer rolling ball sleeve: the inner rolling ball and the outer rolling ball sleeve as well as the outer rolling ball sleeve and the wear-resistant bushing 1 are all in spherical contact, and the metal joint outer seat sleeve, the outer rolling ball sleeve, the inner rolling ball and the wear-resistant bushing 1 are assembled into an integral metal joint bearing by screws.

[0005] It can be seen from the above patent documents that in order to prevent external debris such as sand, water or dust from entering the interior of the joint, a sealing ring groove is opened on the inner circumference of the outer seat sleeve of the metal joint, and a sealing ring is arranged in the sealing ring groove to seal the interior of the joint.

[0006] However, the current sealing structure only uses an independent sealing ring for sealing. During operation, the metal joint can rotate and swing at a certain angle in the vertical, horizontal and longitudinal directions. In this way, the tightness of the sealing ring will not be very stable, and sometimes the sealing of the sealing ring will fail, resulting in the inability to achieve the sealing effect here, thereby reducing the service life of the entire product.

[0007] In summary, how to design a sealing method for the metal joint in the articulated device of a low-floor vehicle, so that the sealing structure can ensure tightness during the working process of the metal joint and prevent seal failure, thereby better preventing foreign matters such as sand, water or dust from entering the joint interior and improving the service life of the entire product is a technical problem that urgently needs to be solved. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a sealing method for the metal joint in the articulated device of a low-floor vehicle to address the defects in the prior art. The sealing structure formed by using this sealing method has strong tightness during the working process of the metal joint, and there will be no problem of seal failure, thereby better preventing foreign matters such as sand, water or dust from entering the joint interior and improving the service life of the entire product.

[0009] To solve the above technical problem, the technical solution adopted by the present invention is as follows: A sealing method for the metal joint in the articulated device of a low-floor vehicle. The metal joint includes an outer seat sleeve of the metal joint, an outer rolling ball sleeve disposed inside the outer seat sleeve of the metal joint, and an inner limiting block disposed inside the outer rolling ball sleeve. The opposite surfaces between the outer rolling ball sleeve and the inner limiting block are both spherical surfaces. The sealing method is that a wear-resistant ball sleeve I is vulcanized with rubber inside the outer seat sleeve of the metal joint. The wear-resistant ball sleeve I is in spherical contact with the outer rolling ball sleeve. A rubber sealing ring is provided on the rubber near the top of the outer seat sleeve of the metal joint. The rubber sealing ring and the rubber are integrally vulcanized. When the inner limiting block is locked on the outer seat sleeve of the metal joint by bolts, so that the inner limiting block, the outer rolling ball sleeve, the wear-resistant ball sleeve I and the outer seat sleeve of the metal joint form a metal joint, the outer rolling ball sleeve is used to contact the rubber sealing ring to form a sealing structure I to seal the inside of the metal joint.

[0010] Preferably, an annular step portion is provided at the inner top of the outer rolling ball sleeve, an annular groove is provided on the annular step portion, and a sealing ring is provided in the annular groove. During assembly, by pressing the top plate against the annular step portion, the top plate is used to press and contact the sealing ring to form a sealing structure II.

[0011] Preferably, the rubber includes a spherical rubber body. The spherical rubber body is vulcanized and bonded between the inner spherical surface of the outer seat sleeve of the metal joint and the outer spherical surface of the wear-resistant ball sleeve I. The bottom end of the rubber sealing ring is in contact with one end of the spherical rubber body to form an integral structure.

[0012] Preferably, the top end of the rubber sealing ring is designed to be inclined, and the top end of the rubber sealing ring is inclined downward along the outer rolling ball sleeve towards the outer seat sleeve of the metal joint.

[0013] Preferably, an axially extending post is further provided on the inner spherical surface of the outer housing of the metal joint. The other end of the spherical rubber body extends to form a sleeve-shaped rubber body, and the sleeve-shaped rubber body is used to wrap around the outer peripheral surface of the post.

[0014] Preferably, a spacer sleeve is provided inside the spherical rubber body.

[0015] Preferably, multiple layers of spacer sleeves are provided; the rubber sealing ring wraps around the top position of the multiple layers of spacer sleeves, so as to wrap the top of the multiple layers of spacer sleeves through the rubber sealing ring.

[0016] Preferably, multiple layers of spacer sleeves are provided; the rubber sealing ring wraps around the top position of the spacer sleeve closest to the outer rolling ball sleeve, so as to wrap the top of the spacer sleeve closest to the outer rolling ball sleeve through the rubber sealing ring.

[0017] Preferably, an inlay groove is provided on the side of the spacer sleeve; first, the spacer sleeve is vulcanized and bonded to the outer housing of the metal joint with rubber, and then the first wear-resistant ball sleeve is embedded into the inlay groove on the spacer sleeve, so that the first wear-resistant ball sleeve is vulcanized with rubber inside the outer housing of the metal joint.

[0018] Preferably, an oil storage groove is provided on the contact spherical surface between the first wear-resistant ball sleeve and the outer rolling ball sleeve.

[0019] The beneficial effects of the present invention are as follows: Through design, the rubber sealing ring and the rubber are designed as an integral structure and vulcanized and bonded to the outer housing of the metal joint with rubber, thus forming a rubber body structure with greater strength. When the metal joint is in operation, no matter how the components of the metal joint rotate or swing, it can ensure that the sealing structure formed by the contact between the outer rolling ball sleeve and the rubber sealing ring has strong tightness and will not cause sealing failure, thereby better preventing foreign matters such as sand, water, or dust from entering the joint interior and improving the service life of the entire product. In addition, the rubber sealing ring and the rubber are designed as an integral structure, which can also reduce the production cost during manufacturing. In addition, in the present invention, when the product rotates or swings at a small angle, it is borne by the deformation of the rubber between the first wear-resistant ball sleeve and the outer housing of the metal joint. At this time, the first wear-resistant ball sleeve and the outer rolling ball sleeve are relatively stationary. Only when the product rotates or swings at a large angle and the acting force exceeds the static friction force between the first wear-resistant ball sleeve and the outer rolling ball sleeve, will the first wear-resistant ball sleeve and the outer rolling ball sleeve move relative to each other to form a friction pair. At this time, the product movement is borne by the rubber deformation and the friction pair together, thus greatly improving the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axial sectional structural schematic diagram of the metal joint in the first embodiment of the present invention; Figure 2 The axial sectional structure schematic diagram of the articulated device of the low-floor vehicle in the first embodiment of the present invention; Figure 3 is Figure 1 the enlarged structure schematic diagram of part A in Figure 4 is Figure 1 the enlarged structure schematic diagram of part B in Figure 5 is Figure 1 the enlarged structure schematic diagram of part C in Figure 6 The partial axial sectional structure schematic diagram of the metal joint in the second embodiment of the present invention at the sealing ring; In the figure: 1. Outer seat sleeve of the metal joint; 111. Axial column; 2. Outer rolling ball sleeve; 211. Annular step portion; 212. Annular groove; 3. Inner limit block; 311. Step-shaped groove; 4. Rubber; 411. Spherical rubber body; 412. Sleeve-shaped rubber body; 5. Wear-resistant ball sleeve one; 6. Rubber sealing ring; 7. Bolt; 8. Upper fixed support; 9. Lower fixed support; 10. Metal joint; 11. Sealing ring; 12. Sealing ring; 13. Spacer sleeve; 14. Inlay groove; 15. Oil storage groove. Specific implementation manners

[0021] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Embodiment 1: As shown in Figure 1As shown, a sealing method for a metal joint in a low-floor vehicle articulation device, where the metal joint includes an outer seat sleeve 1 of the metal joint, an outer rolling ball sleeve 2 disposed inside the outer seat sleeve 1 of the metal joint, and an inner limit block 3 disposed inside the outer rolling ball sleeve 2. The opposite surfaces between the outer rolling ball sleeve 2 and the inner limit block 3 are both arranged as mutually matching spherical surfaces. The sealing method is that a wear-resistant ball sleeve 5 is vulcanized with rubber 4 inside the outer seat sleeve 1 of the metal joint. The wear-resistant ball sleeve 5 is in spherical contact with the outer rolling ball sleeve 2. A rubber sealing ring 6 is provided on the rubber 4 near the top of the outer seat sleeve 1 of the metal joint. The rubber sealing ring 6 and the rubber 4 are integrally vulcanized and formed. When the inner limit block 3 is locked on the outer seat sleeve 1 of the metal joint by bolts 7 so that the inner limit block 3, the outer rolling ball sleeve 2, the wear-resistant ball sleeve 5, and the outer seat sleeve 1 of the metal joint form a metal joint, the outer rolling ball sleeve 2 is in contact with the rubber sealing ring 6 to form a sealing structure to seal the inside of the metal joint. In this embodiment, the rubber sealing ring and the rubber are designed as an integral structure and are bonded to the outer seat sleeve of the metal joint by rubber vulcanization, thereby forming a rubber body structure with greater strength. When the metal joint is in operation, no matter how the components of the metal joint rotate or swing, it can ensure that the sealing structure formed by the contact between the outer rolling ball sleeve and the rubber sealing ring has strong tightness and will not cause sealing failure, so as to better prevent foreign matters such as sand, water, or dust from entering the joint interior and improve the service life of the entire product. In addition, the rubber sealing ring and the rubber are designed as an integral structure, which can also reduce the production cost in manufacturing. In addition, in the patent documents mentioned in the background technology, when the product rotates or swings, whether it is a large-angle movement or a small-angle movement, it is borne by the friction pair formed between the wear-resistant bushing and the outer rolling ball sleeve. After a long working time, it is easy to cause excessive wear, thus reducing the service life of the product. In this embodiment, when the product makes a small-angle rotation or swing, it is borne by the rubber deformation between the wear-resistant ball sleeve 1 and the outer seat sleeve of the metal joint. At this time, the wear-resistant ball sleeve 1 and the outer rolling ball sleeve are relatively stationary. Only when the product makes a large-angle rotation or swing and the acting force exceeds the static friction force between the wear-resistant ball sleeve 1 and the outer rolling ball sleeve, will the wear-resistant ball sleeve 1 and the outer rolling ball sleeve move relative to each other to form a friction pair. At this time, the product movement is borne by the rubber deformation and the friction pair together, thus greatly improving the service life of the product.

[0023] As Figure 2As shown, the entire metal joint 10 further connects adjacent car bodies through the upper fixing support 8 and the lower fixing support 9. The entire metal joint 10 is applied to the car body hinging device, meeting the combined loading conditions of vertical, lateral, longitudinal, and large torsional angle; the metal joint 10 has automatic centering, and the spherical surfaces of the outer seat sleeve 1 of the metal joint, the first wear-resistant ball sleeve 5, the outer rolling ball sleeve 2, and the inner limiting block 3 are all co-centered, and the metal joint 10 can make three independent relative rotations around this center of the sphere. The first wear-resistant ball sleeve 5 can be made of wear-resistant materials such as polyester, copper-inlaid graphite, or PTFE.

[0024] As Figure 1 and Figure 3 As shown, one end of the rubber sealing ring 6 is designed in a double-lip shape. After assembly, the double-lip-shaped end of the rubber sealing ring 6 contacts the outer spherical surface of the outer rolling ball sleeve 2 to form a sealing structure to seal the inside of the metal joint. The rubber 4 includes a spherical rubber body 411, and the spherical rubber body 411 is vulcanized and bonded between the inner spherical surface of the outer seat sleeve 1 of the metal joint and the outer spherical surface of the first wear-resistant ball sleeve 5. The bottom end of the rubber sealing ring 6 contacts one end of the spherical rubber body 411 to form an integral structure, which increases the contact area between the rubber sealing ring 6 and the spherical rubber body 411, making the overall rubber structure stronger and with higher strength.

[0025] The top end of the rubber sealing ring 6 is designed to be inclined, and the top end of the rubber sealing ring 6 slopes downward along the outer rolling ball sleeve 2 towards the outer seat sleeve 1 of the metal joint. This enables the sewage flowing to the top end of the rubber sealing ring to flow out along the inclined top end of the rubber sealing ring 6, and no water accumulation will occur here. On the inner spherical surface of the outer seat sleeve 1 of the metal joint, there is also an upward protruding shaft column 111. The shaft column 111 and the outer seat sleeve 1 of the metal joint are of an integral structure. The other end of the spherical rubber body 411 extends to form a sleeve-shaped rubber body 412, and the sleeve-shaped rubber body 412 is used to wrap around the outer peripheral surface of the shaft column 111. This design has two functions. One is to use the sleeve-shaped rubber body to wrap the shaft column to achieve the functions of rust prevention and corrosion prevention. The other is to increase the overall volume of the rubber and the vulcanized bonding area between the rubber and the outer seat sleeve of the metal joint, thereby further improving the overall strength of the rubber. At the top of the shaft column 111, there is a stepped protruding portion 112, and on the bottom surface of the inner limiting block 3, there is a stepped groove 311 matching the stepped protruding portion 112. During installation, through the cooperation and contact of the stepped protruding portion 112 and the stepped groove 311, the inner limiting block 3 is snapped onto the shaft column 111 of the outer seat sleeve 1 of the metal joint, and then the inner limiting block 3 is locked onto the outer seat sleeve 1 of the metal joint by bolts 7, so that the inner limiting block 3, the outer rolling ball sleeve 2, the first wear-resistant ball sleeve 5, and the outer seat sleeve 1 of the metal joint form the metal joint.

[0026] As Figure 1 andFigure 4 As shown, an annular step portion 211 is provided at the inner top portion close to the outer rolling ball sleeve 2. An annular groove 212 is provided on the annular step portion 211, and a sealing ring 11 is provided in the annular groove 212. During assembly, by pressing the top plate 12 against the annular step portion 211, the top plate 12 presses against and contacts the sealing ring 11 to form a second sealing structure, thereby further improving the sealing performance of the entire product. The top plate 12 can be made of materials such as nylon.

[0027] As Figure 1 and Figure 3 As shown, a spacer sleeve 13 is provided inside the spherical rubber body 411. The spacer sleeve 13 can be provided in multiple layers and can be made of a metal material. By providing the spacer sleeve 13 inside the spherical rubber body 411, especially when multiple spacer sleeves 13 are provided, the product can have a smaller deflection stiffness and torsional stiffness, so that the derivative stiffness of the vehicle body is smaller, and it can also ensure that the product has a larger vertical stiffness and radial stiffness, further optimizing the mechanical properties of the product and increasing the service life. In addition, when the spacer sleeve 13 is a multi-layer spacer sleeve, the rubber sealing ring 6 is wrapped around the top position of the multi-layer spacer sleeve, so that the top of the multi-layer spacer sleeve is wrapped by the rubber sealing ring 6, which can also prevent the spacer sleeve from corroding.

[0028] As Figure 3 As shown, an inlay groove 14 is provided on the side of the spacer sleeve 13 closest to the outer rolling ball sleeve 2. During manufacturing, first, the spacer sleeve 13 is vulcanized and bonded to the metal joint outer seat sleeve 1 through rubber 4, and then the first wear-resistant ball sleeve 5 is embedded into the inlay groove 14 on the spacer sleeve 13, so that the first wear-resistant ball sleeve 5 is vulcanized inside the metal joint outer seat sleeve 1 through rubber 4. Here, if the first wear-resistant ball sleeve is directly vulcanized and bonded to the rubber, due to the material characteristics between the two, the bonding effect between them will not be very good; in addition, since the first wear-resistant ball sleeve can be made of wear-resistant materials such as polyester, copper-inlaid graphite or PTFE, in order to ensure its bonding effect, it is also necessary to study and analyze the bonding performance of various materials, which is relatively complicated; in addition, if the first wear-resistant ball sleeve is vulcanized and bonded to the rubber, it is not convenient for the subsequent replacement of the first wear-resistant ball sleeve, increasing the maintenance cost. Therefore, in this embodiment, the spacer sleeve is first vulcanized and bonded to the rubber, and then the first wear-resistant ball sleeve is installed on the spacer sleeve by an embedded method, so that the influence of the material characteristics of the first wear-resistant ball sleeve on the bonding effect does not need to be considered, thus ensuring the installation effect of the first wear-resistant ball sleeve, reducing the manufacturing difficulty and enabling the first wear-resistant ball sleeve to be replaced conveniently and quickly during subsequent maintenance, and also reducing the maintenance cost.

[0029] As Figure 1 and Figure 5As shown, an oil storage groove 15 is provided on the contact spherical surface between the wear-resistant ball sleeve 1-5 and the outer rolling ball sleeve 2. The oil storage groove 15 can be provided on the outer rolling ball sleeve 2 or, as in this embodiment, on the wear-resistant ball sleeve 1-5. During operation, by storing lubricating grease in the oil storage groove 15, the wear degree during product operation can be reduced, and the lubrication effect can be further improved.

[0030] Embodiment 2: In Embodiment 1, as Figure 3 shown, when multiple spacer sleeves 13 are provided inside the spherical rubber body 411, during operation, the top of the multiple spacer sleeves 13 may generate a shearing force on the rubber sealing ring 6 wrapped around its top, thereby forming rubber fatigue and causing damage to the rubber here, reducing the service life. For this reason, in this embodiment, as Figure 6 shown, compared with Embodiment 1, the difference is that when the spacer sleeve 13 is a multiple spacer sleeve, the rubber sealing ring 6 and the rubber 4 are integrally vulcanized and formed, and the rubber sealing ring 6 only wraps around the top position of the spacer sleeve 13 closest to the outer rolling ball sleeve 2. In this way, the rubber sealing ring 6 only wraps around one spacer sleeve, which can reduce the shearing force generated between them, thereby avoiding damage to the rubber here and improving the service life.

[0031] In summary, through the design of the present invention, the rubber sealing ring and the rubber are designed as an integral structure and are adhesively bonded to the outer seat sleeve of the metal joint by rubber vulcanization, thereby forming a rubber body structure with relatively high strength. When the metal joint is in operation, no matter how the components of the metal joint rotate or swing, it can ensure that the sealing structure formed by the contact between the outer rolling ball sleeve and the rubber sealing ring has strong tightness and will not have a problem of seal failure. Thus, it can better prevent foreign substances such as sand, water, or dust from entering the joint interior, improving the service life of the entire product. In addition, designing the rubber sealing ring and the rubber as an integral structure can also reduce production costs during manufacturing. In addition, in the present invention, when the product generates small-angle rotation or swing, it is borne by the rubber deformation between the wear-resistant ball sleeve 1 and the outer seat sleeve of the metal joint. At this time, the wear-resistant ball sleeve 1 and the outer rolling ball sleeve are relatively stationary. Only when the product generates large-angle rotation or swing and the acting force exceeds the static friction force between the wear-resistant ball sleeve 1 and the outer rolling ball sleeve, will the wear-resistant ball sleeve 1 and the outer rolling ball sleeve move relative to each other to form a friction pair. At this time, the product movement is borne by the rubber deformation and the friction pair together, thus greatly improving the service life of the product.

[0032] The "plurality" mentioned in the embodiments refers to a quantity of "two or more". The above embodiments are only for illustrating the present invention and not for limiting the present invention. Those skilled in the relevant technical field can also make various changes or transformations without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the present invention, and the protection scope of the present invention should be defined by each claim.

Claims

1. A sealing method for a metal joint in an articulated device of a low-floor vehicle, wherein the metal joint comprises an outer seat sleeve of the metal joint, an outer rolling ball sleeve arranged inside the outer seat sleeve of the metal joint, and an inner stop block arranged inside the outer rolling ball sleeve, wherein the opposing surfaces between the outer rolling ball sleeve and the inner stop block are both arranged to be spherical surfaces, and wherein: The sealing method is as follows: a wear-resistant ball sleeve is vulcanized with rubber inside the outer seat sleeve of the metal joint, the wear-resistant ball sleeve is in spherical contact with the outer rolling ball sleeve, a rubber sealing ring is arranged on the rubber near the top of the outer seat sleeve of the metal joint, the rubber sealing ring and the rubber are vulcanized and formed as one body, when the inner limit block is locked on the outer seat sleeve of the metal joint by bolts so that the inner limit block, the outer rolling ball sleeve, the wear-resistant ball sleeve and the outer seat sleeve of the metal joint form a metal joint, the outer rolling ball sleeve is in contact with the rubber sealing ring to form a sealing structure to seal the inside of the metal joint.

2. The sealing method according to claim 1, characterized in that: An annular step portion is provided near the inner top of the outer rolling ball sleeve, an annular groove is provided on the annular step portion, and a sealing ring is provided in the annular groove; during assembly, the top plate is pressed against the annular step portion, thereby forming a sealing structure 2 by pressing the top plate against the sealing ring.

3. The sealing method according to claim 1, characterized in that: The rubber comprises a spherical rubber body, which is vulcanized and bonded between the inner spherical surface of the metal joint outer seat sleeve and the outer spherical surface of the wear-resistant ball sleeve. The bottom end of the rubber sealing ring contacts one end of the spherical rubber body to form an integrated structure.

4. The sealing method according to claim 3, characterized in that: The top end of the rubber sealing ring is designed to be inclined, and the top end of the rubber sealing ring is inclined downward along the outer rolling ball sleeve toward the outer seat sleeve of the metal joint.

5. The sealing method according to claim 3, characterized in that: An upwardly extending shaft column is also arranged on the inner spherical surface of the metal joint outer seat sleeve, and the other end of the spherical rubber body extends out to form a sleeve-shaped rubber body, which is used to wrap the outer peripheral surface of the shaft column.

6. The sealing method according to claim 5, characterized in that: A spacer is arranged inside the spherical rubber body.

7. The sealing method according to claim 6, characterized in that: The spacer is provided with multiple layers; the rubber sealing ring is wrapped at the top position of the multi-layer spacer, so that the top of the multi-layer spacer is wrapped by the rubber sealing ring.

8. The sealing method according to claim 6, characterized in that: The spacer is provided with multiple layers; the rubber sealing ring is wrapped at the top position of a layer of the spacer closest to the outer rolling ball sleeve, so that the top of the layer of the spacer closest to the outer rolling ball sleeve is wrapped by the rubber sealing ring.

9. The sealing method according to claim 6, 7 or 8, characterized in that: An embedding groove is arranged on the side of the spacer; the spacer is first bonded to the outer seat sleeve of the metal joint by rubber vulcanization, and then a wear-resistant ball sleeve is embedded into the embedding groove on the spacer, so that a wear-resistant ball sleeve is disposed inside the outer seat sleeve of the metal joint by rubber vulcanization.

10. The sealing method according to claim 9, characterized in that: An oil storage groove is arranged on the contact spherical surface between the wear-resistant ball sleeve 1 and the outer rolling ball sleeve.

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