Search

CN-121977013-A - Full ball loading structure and method for thin-wall four-point contact bearing

CN121977013ACN 121977013 ACN121977013 ACN 121977013ACN-121977013-A

Abstract

The invention discloses a full ball loading structure and a full ball loading method of a thin-wall four-point contact bearing, belongs to the technical field of bearings, and is suitable for precise transmission scenes such as the output end of a robot joint module. The structure comprises an outer ring, an inner ring, rolling bodies, a locating pin, a plugging block and a sealing ring, wherein a single-sided opening is formed in the outer diameter surface of the outer ring and is the only ball loading channel, the working surfaces of the inner ring and the outer ring are of four-point contact peach-shaped groove structures, the rolling bodies are fully installed in a roller path through the opening, the side wall of the outer ring is provided with a pin hole, the plugging block is provided with a limiting hole, and the locating pin is inserted into the pin hole and the limiting hole and is in interference fit with the limiting hole, so that the roller path is sealed and the steel ball is located. The bearing assembly adopts a crossed roller improved ball loading mode, adopts a single-sided perforated design to load balls, has high assembly efficiency and simplified process, and the full-installation design enhances the bearing capacity, has reliable positioning and stable operation, and effectively solves the problems of insufficient axial load, complex assembly and the like in the prior art.

Inventors

  • SHI YONGQI

Assignees

  • 浙江百润轴承有限公司

Dates

Publication Date
20260505
Application Date
20260123

Claims (8)

  1. 1. The full ball structure of the thin-wall four-point contact bearing is characterized by comprising an outer ring (1), an inner ring (2), rolling bodies (3), positioning pins (5), blocking blocks (4) and a sealing ring (6); The outer diameter surface of the outer ring (1) is provided with a single-sided opening (10), and the opening (10) is the only ball loading channel; The working surfaces of the inner ring (2) and the outer ring (1) are of four-point contact peach-shaped groove structures; The rolling bodies (3) are steel balls and are assembled in the raceways of the peach-shaped groove structures through the holes (10) in a full-loading mode; The plugging block (4) is used for plugging the open hole (10) and is provided with a limiting hole, and the side wall of the outer ring (1) is provided with a pin hole (11); the locating pin (5) is inserted into the pin hole (11) and the limiting hole to realize the sealing of the rollaway nest and the locating of the steel ball; The sealing rings (6) are arranged on two end faces of the bearing.
  2. 2. The full-load ball structure of the thin-wall four-point contact bearing is characterized in that the outer ring (1) and the inner ring (2) are made of GCr15 bearing steel, the outer diameter of the outer ring (1) is 51mm, the tolerance is 0-0.011mm, the inner diameter of the inner ring (2) is 40mm, and the tolerance is 0-0.010mm.
  3. 3. The full-load ball structure of the thin-wall four-point contact bearing of claim 1, wherein the rolling bodies (3) are steel balls made of GCr15, the diameter is 2.381mm, and the number is 59.
  4. 4. The full-load ball structure of the thin-wall four-point contact bearing, as claimed in claim 1, is characterized in that the diameter of the locating pin (5) is 1.0mm, and the locating pin (5) is in interference fit with the pin hole (11).
  5. 5. The full-load ball structure of the thin-wall four-point contact bearing is characterized in that an annular sealing groove (7) is formed between the outer ring (1) and the inner ring (2), the sealing ring (6) is embedded in the annular sealing groove (7), and the sealing ring (6) is made of NBR and SPCC composite materials.
  6. 6. A method of assembling a full ball of a thin wall four point contact bearing according to any one of claims 1 to 5, comprising the steps of: The method comprises the steps of S1, preparing an outer ring (1), an inner ring (2), rolling bodies (3), positioning pins (5), blocking blocks (4) and sealing rings (6), wherein a single-sided opening (10) is formed in the outer diameter surface of the outer ring (1) during processing, pin holes (11) are formed in the side walls of the outer ring, and the inner wall of the outer ring is processed into a peach-shaped groove structure matched with the outer ring (1), the outer ring (1) and the inner ring (2) are assembled to form an annular sealing groove (7), the rolling bodies (3) are made of GCr15 steel balls, and limiting holes corresponding to the pin holes (11) are formed in the blocking blocks (4); s2, coaxially assembling the inner ring (2) and the outer ring (1), sequentially conveying steel balls into a peach-shaped groove raceway through a single-sided opening (10) of the outer ring (1) in an improved assembly mode based on a crossed roller loading structure, and rotating the outer ring (1) to uniformly distribute the steel balls and fill the raceway; Step S3, embedding the blocking block (4) into a single-sided opening (10) of the outer ring (1), aligning a limit hole of the blocking block (4) with a pin hole (11) of the outer ring (1), inserting a positioning pin (5) into the pin hole (11) and the limit hole, and fixing the blocking block (4) and axially positioning a steel ball through interference fit; And S4, respectively embedding the sealing rings (6) into annular sealing grooves (7) between the outer ring (1) and the inner ring (2) to complete the integral assembly of the bearing.
  7. 7. The method for assembling a full ball of a thin-wall four-point contact bearing according to claim 6, wherein in step S2, a small amount of lubricating grease is smeared in the peach-shaped groove rollaway nest during the assembling process, thereby assisting the positioning of the steel ball and reducing the assembling wear.
  8. 8. The method for assembling the full complement ball of the thin-wall four-point contact bearing of claim 6, wherein in the step S3, anaerobic adhesive is smeared on the inner wall of the pin hole (11) before the positioning pin (5) is inserted, so that the fixing reliability of the positioning pin (5) and the pin hole (11) is enhanced.

Description

Full ball loading structure and method for thin-wall four-point contact bearing Technical Field The invention relates to the technical field of bearings, in particular to a full-load ball structure of a thin-wall four-point contact bearing and a loading and solving method. Background The four-point contact ball bearing can bear radial load and bidirectional axial load simultaneously, has the characteristics of compact structure and high rotation precision, and is widely applied to precision transmission equipment such as robot joint modules and the like. In the prior art, as disclosed in patent publication No. CN104033489A, a full ball structure of a constant-section ultrathin-wall four-point contact bearing is disclosed, the working surfaces of an inner ring and an outer ring of a bearing ring are in a peach-shaped groove shape with four-point contact, and a slope with locking quantity is designed on the non-base surface outer inner diameter of the outer ring. According to the technical scheme, the slope structure of the angular contact ball bearing is applied to the four-point contact ball bearing, the rolling bodies are very convenient to assemble, the bearing cannot bear bidirectional axial force, the assembly process is complex, and the high-load scene requirement is difficult to meet. In addition, the traditional four-point contact ball bearing or the structure design of the full ball bearing is lacking, the bearing capacity is weak due to the limited number of rolling bodies, and the holes are closed by independent blocking pieces after ball loading, so that the assembly process and the production cost are increased, the risk of falling off the blocking pieces exists, and the running stability of the bearing is affected. Disclosure of Invention The invention mainly aims to provide a full-ball structure of a thin-wall four-point contact bearing, which is used for solving the technical problems. In order to achieve the aim, the invention provides the technical scheme that the full ball structure of the thin-wall four-point contact bearing comprises an outer ring, an inner ring, rolling bodies, a positioning pin, a blocking block and a sealing ring; the outer diameter surface of the outer ring is provided with a single-sided opening, and the opening is the only ball loading channel; The working surfaces of the inner ring and the outer ring are of peach-shaped groove structures with four-point contact; The rolling bodies are steel balls and are assembled in the raceways of the peach-shaped groove structures through the openings in a full-loading mode; the plugging block is used for plugging the open hole and is provided with a limiting hole; The locating pin is inserted into the pin hole and the limiting hole to realize the sealing of the rollaway nest and the locating of the steel ball; The sealing rings are arranged on two end faces of the bearing. On the basis of the scheme, the preferable scheme is that the materials of the outer ring and the inner ring are GCr15 bearing steel, the outer diameter size of the outer ring is 51mm, the tolerance is 0-0.011mm, the inner diameter size of the inner ring is 40mm, and the tolerance is 0-0.010mm. On the basis of the scheme, the preferable scheme of the scheme is that the rolling bodies are GCr15 steel balls, the diameter is 2.381mm, and the number is 59. On the basis of the scheme and as a preferable scheme of the scheme, the diameter of the locating pin is 1.0mm, and the locating pin is in interference fit with the pin hole. On the basis of the scheme, the preferable scheme of the scheme is that an annular sealing groove is formed between the outer ring and the inner ring, a sealing ring is embedded in the annular sealing groove, and the sealing ring is made of NBR and SPCC composite materials. The assembly method of the full-load ball of the thin-wall four-point contact bearing comprises the following steps: The method comprises the steps of S1, preparing an outer ring, an inner ring, rolling bodies, a locating pin, a plugging block and a sealing ring, wherein a single-sided opening is formed in the outer diameter surface of the outer ring during processing, a pin hole is formed in the side wall of the outer ring, and the inner wall of the outer ring is processed into a peach-shaped groove structure matched with the outer ring, and an annular sealing groove is formed after the outer ring is assembled with the inner ring; S2, coaxially assembling the inner ring and the outer ring, sequentially conveying the steel balls into the peach-shaped groove rollaway nest by adopting an improved assembly mode based on a crossed roller loading structure through single-sided perforating of the outer ring, and rotating the outer ring to uniformly distribute the steel balls and fill the rollaway nest; step S3, embedding the blocking block into a single-sided opening of the outer ring, aligning a limit hole of the blocking block with a pin hole of the outer ring, inserting a