CN211574048U - 7224CETA-RZ ultra-high-speed single-side sealed angular contact ball bearing - Google Patents

Abstract

The utility model provides a 7224CETA-RZ ultrahigh speed, single face sealed angular contact ball bearing. The steel framework is arranged between the army armor steel outer ring and the army armor steel inner ring in a one-way mode through rubber sealing rings, an inward bending angle of 45 degrees is arranged on the steel framework and used for supporting the whole action of the rubber sealing rings, the outer diameter of the steel framework is provided with an outer diameter angle of 7 degrees which is convenient for glue injection drawing, the rubber sealing rings are of double-lip sealing structures, and the army armor steel outer ring is of a symmetrical outer ring structure and is assembled with a machine tool box body inner part; the army armor steel inner ring is of an asymmetric inner ring structure and is matched with a machine tool spindle in an installation mode. The utility model discloses not only can improve the revolution, all meet the requirements in aspects such as speed adaptability, stability and durability, flexibility, simultaneously can well lubricate, be convenient for install.

Description

7224CETA-RZ ultra-high-speed single-side sealed angular contact ball bearing

Technical Field

The utility model relates to a bearing machining center field, concretely relates to superspeed, single face seal angular contact ball bearing.

Background

For many years, the industrial chains of many bearing manufacturers in China do not meet the requirements of various technical indexes of the existing main shaft during working from the aspects of sealing effect, bearing, mechanical performance and rigidity, particularly the limit revolution number through changing the structural design of the product, trial-manufacturing in small batches, testing, installing experiments by users and the like for a plurality of times, which is a great problem. The 7224CETA-RZ angular contact ball bearing which is urgently needed in the market at present and has high rotating speed (more than 8000 rpm), paired double connection, triple connection and multiple connection. At present, each family in the national machine tool industry needs an ultra-high-speed single-seal 7224CETA-RZ angular contact ball bearing; although the existing products of the type in the market are all used in a machine tool spindle machining center, all mechanical properties of the products can not always meet the requirements of the existing numerical control digital precision machine tool, and particularly the limit revolution number exceeds 8000 rpm; the method is very annoying to many manufacturers, and the manufacturers in Luoyang, Harbin and large junior repeatedly study, design and trial-manufacture in China, cannot reach the required limit revolution, and has no satisfactory result at present.

Disclosure of Invention

An object of the utility model is to provide a 7224CETA-RZ hypervelocity, single face sealed angular contact ball bearing that not only can improve the revolution, all meet the requirements in aspects such as speed adaptability, stability and durability, flexibility.

The purpose of the utility model is realized like this: the steel framework is arranged between the army steel outer ring and the army steel inner ring in a one-way mode through rubber sealing rings, an inward-bending 45-degree angle for supporting the whole action of the rubber sealing rings is arranged on the steel framework, the outer diameter of the steel framework is provided with an outer diameter 7-degree angle convenient for glue injection drawing, the rubber sealing rings are of a double-lip sealing structure, the rubber sealing rings are respectively provided with an outer diameter 15 degree, an inner diameter 30 degree and an inner diameter 60-degree angle, a pocket opening of the phenolic bakelite retainer is a 26.2+0.05 large straight pocket opening, the army steel outer ring is of a symmetrical outer ring structure and is assembled with a machine tool box body inner part; the army armor steel inner ring is of an asymmetric inner ring structure and is matched with a machine tool spindle in an installing mode, the phenolic bakelite retainer guides the army armor steel outer ring to be arranged, and the curvature of the inner groove is larger than the curvature coefficient of the outer groove, namely 0.55 and 0.52; the army steel rolling elements comprise 19 balls with a grain size of 25.4 (1'), and the radial wall thickness of the bakelite cage is 7.15.

The inner ring, the outer ring and the rolling body of the product structure of the utility model are made of ZGCR 15-army armor steel materials, and the curvature of the inner groove in the structure is larger than the curvature coefficient of the outer groove, namely 0.55 and 0.52; the curvature of the bearing is larger than that of a normal super-high-speed bearing, four-gear ball diameter (25.4 (1') balls) smaller than a standard ball selection rule are selected, the number of the balls is increased by 5 balls, and 19 balls are taken, so that the limit revolution can be increased, and the rated load can be increased; the inner ring and the outer ring are both designed with 1 degree +/-10' slopes, so that the ball can be well lubricated and is convenient to mount and lock; the cage has the advantages that a pocket with the size of 26.2+0.05 is adopted as a structural design pocket, the rotating space of a rolling body is increased, the necessary conditions of flexible rotation and good lubrication are met, the radial wall thickness of the cage is 7.15, and the ultra-thin phenolic bakelite material can reduce the weight of the bearing and improve the revolution; the structure of the unidirectional rubber sealing ring can save space for pairing of duplex, triple and multiple angular contact, and one sealing ring can be saved by one set of bearing; the number of revolutions can also be increased at the same time. A piece of rubber seal of the single set of bearing in both ends just can play sealed effect. The advanced technology and international orbit of the product can be compared favorably with foreign similar products; the precision grades P4 and P2 tolerance grades, and the limit value standard reaches Z4 and V4; the structural design is optimized, the bearing ring conforms to the ISO19 and ISO10 size series standards, the army armor steel bearing ring is provided with a slope of 1 +/-10' on the inner ring and the locking ball height; the thicknesses of the symmetrical outer ring and the asymmetrical inner ring are ultrathin, and the distribution of a lubricating oil layer on the raceway has obvious influence on the lubricating performance of the bearing; in bearing lubrication, the flowing and backfilling of a lubricating medium are influenced by centrifugal force, surface tension and the like, the action of the centrifugal force is closely related to the shape of a raceway, and a rotating surface oil layer distribution theoretical model is established based on a Navier-Stokes equation and a continuous equation. The width and the thickness of the retainer are very thin, the whole weight of the bearing is reduced, the bearing can rotate more flexibly, and the limit revolution is improved.

The utility model discloses the effect has:

1) the inner ring and the outer ring are made of army armor steel ZGCR15, so that the rigidity, the bearing capacity and the corrosion resistance of the bearing are improved; the inner ring and the outer ring are internally provided with slopes of 1 +/-10', so that the ball locking effect is achieved, and meanwhile, the ball locking structure can be well lubricated and is convenient to install. 2) The tolerance grades of P4 and P2 can ensure that the bearing has good running precision and short running-in time; 3) the small ball and multi-ball structure can greatly improve the limit revolution of the bearing and can also increase the rated load of the bearing. 4) Compact cross-sectional area in compliance with ISO19 and ISO10 size series standards; 5) the army armor steel sleeve prolongs the service life of the bearing and has excellent corrosion resistance; 6) the oil layers on the surfaces of the inner raceway and the outer raceway are uniformly distributed, and the speed performance is high; 7) the thin-wall and narrow-width structure of the retainer belongs to the requirements of a high-speed bearing, and not only can reduce the weight of the bearing, but also can improve the limit revolution. The cage pocket is selected to be large, so that the rolling bodies can rotate flexibly in an effective space, and the revolution is improved. 9) The symmetrical outer ring and the asymmetrical inner ring can bear axial load or radial load (load limited to one direction)

Description of the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a rubber seal ring;

FIG. 3 is a schematic structural diagram of a army armor steel outer ring;

FIG. 4 is a schematic structural diagram of a army armor steel inner ring;

FIG. 5 is a schematic view of a steel skeleton structure.

Detailed Description

With reference to fig. 1-5, the present embodiment includes a military first steel outer ring 1, a military first steel inner ring 2, a military first steel rolling element 4 and a bakelite cage 56, wherein the military first steel inner ring 2 and the military first steel outer ring 1 are both provided with slopes of 1 ° ± 10', a steel skeleton 57 is unidirectionally arranged between the military first steel outer ring and the military first steel inner ring through a rubber seal 58, the steel skeleton is provided with an inward-bent 45 ° angle for supporting the whole action of the rubber seal, the outer diameter of the steel skeleton is provided with an outer diameter 7 ° angle convenient for glue injection drawing, the rubber seal is a double-lip seal structure, the rubber seal is respectively provided with an outer diameter of 15 °, an inner diameter of 30 ° and an inner diameter of 60 °, a bakelite cage pocket is a large straight pocket opening of 26.2+0.05, the military first steel outer ring is of a symmetrical outer ring; the army armor steel inner ring is of an asymmetric inner ring structure and is matched with a machine tool spindle in an installing mode, the phenolic bakelite retainer guides the army armor steel outer ring to be arranged, and the curvature of the inner groove is larger than the curvature coefficient of the outer groove, namely 0.55 and 0.52; the army steel rolling elements 4 comprise 19 balls with a grain size of 25.4 (1'), and the radial wall thickness of the bakelite cage is 7.15.

Claims (1)

1. The 7224CETA-RZ ultrahigh-speed single-side sealing angular contact ball bearing is characterized by comprising a military first steel outer ring, a military first steel inner ring, a military first steel rolling body and a phenolic bakelite retainer, wherein the military first steel inner ring and the military first steel outer ring are respectively provided with a slope of 1 +/-10 degrees, a steel skeleton is arranged between the military first steel outer ring and the military first steel inner ring in a one-way mode through a rubber sealing ring, the steel skeleton is provided with an inward-bent 45-degree angle for supporting the whole action of the rubber sealing ring, the outer diameter of the steel skeleton is provided with an outer diameter 7-degree angle convenient for glue injection and die drawing, the rubber sealing ring is of a double-lip sealing structure, the rubber sealing ring is respectively provided with an outer diameter of 15 degrees, an inner diameter of 30 degrees and an inner diameter of 60 degrees, a pocket of the phenolic bakelite retainer is a 26.2+0.05 large straight; the army armor steel inner ring is of an asymmetric inner ring structure and is matched with a machine tool spindle in an installing mode, the phenolic bakelite retainer guides the army armor steel outer ring to be arranged, and the curvature of the inner groove is larger than the curvature coefficient of the outer groove, namely 0.55 and 0.52; the army steel rolling elements comprise 19 balls with a grain size of 25.4 (1'), and the radial wall thickness of the bakelite cage is 7.15.

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