CN211343716U - Inner diameter 1220 high-precision long-life combined bearing for vertical lathe spindle - Google Patents

Abstract

A high-precision long-life combined bearing with an inner diameter 1220 for a vertical lathe spindle is provided with a race and a moving coil, wherein a row of Z1 thrust tapered rollers is arranged between the race and the moving coil, and a support column type retainer is arranged between the race and the moving coil. An inner ring is arranged, a row of Z2 centripetal thrust tapered rollers are arranged between the inner ring and the moving ring, and a basket-shaped retainer is arranged. The design of 'rolling bearing limit design method' originally invented by the company is adopted to provide a set of combined bearing outline dimension and 8 structural element numerical values corresponding to the diameters, the lengths, the roller numbers, the half cone angles and the like of the thrust tapered roller and the centripetal tapered roller. Under the condition of meeting the design strength and process conditions, the designed roller has the largest diameter, the longest length, the highest rated dynamic load value of the bearing and the long service life. The company reforms a 1.6-meter vertical lathe entrusted by a certain group, adopts the set of combined bearing KHZZ-09 to replace two sets of thrust ball bearings and a set of double-row cylindrical roller bearing, not only lightens the weight, but also can position and clamp once due to structural change, has high rotation precision, and changes the radial run-out and the end run-out of processed parts from the prior range as high as 0.03mm to less than 0.005 mm.

Description

Inner diameter 1220 high-precision long-life combined bearing for vertical lathe spindle

The technical field is as follows: a high-precision long-life combined bearing for a vertical lathe main shaft is mainly used for supporting the vertical lathe main shaft and bearing radial and axial loads. Belongs to the engineering element bearing class (F16C).

(II) background technology:

the existing vertical lathe support bearing adopts two sets of thrust ball bearings and a set of double-row cylindrical roller bearing to respectively bear axial load and radial load. However, the main shaft support bearing of the vertical lathe consisting of the three sets of bearings has the biggest problem of low machining precision of the vertical lathe. For example, a 1.6-meter vertical lathe which is created by entrusting a certain group company to the company of customers to support the main shaft by adopting the three sets of bearings has low processing precision, the radial and end face runout of processed parts reaches up to 0.03mm, and the problems of heavy weight, small bearing and short service life exist.

Although the chinese utility model "high accuracy long-life combination bearing for merry go round machine main shaft" (ZL 201720757255.1) discloses a high accuracy long-life combination bearing for merry go round machine main shaft, it only discloses a model (KHZZ-11) and can not satisfy the requirement of more high accuracy long-life combination bearing for merry go round machine main shaft long-lives completely.

(III) the invention content:

the utility model provides a vertical lathe main shaft is with high accuracy long-life combination bearing of internal diameter 1220, its purpose just provides a precision height, long-life combination bearing for the user. The technical scheme is as follows:

a high-precision long-life combined bearing with an inner diameter 1220 for a vertical lathe main shaft is provided with a seat ring 7 and an intermediate moving coil 1, a row of Z1 tapered thrust rollers 5 are arranged between the seat ring and the moving coil in the circumferential direction and supported by a strut type retainer 3, and thereby the tapered thrust roller bearing for bearing axial load is formed; an inner ring 2 is arranged, a row of Z2 centripetal thrust tapered rollers 4 are arranged between the outer raceway of the inner ring 2 and the upper raceway of the middle moving ring in the circumferential direction and are supported by a basket-shaped retainer 6; thereby forming a radial load bearing tapered roller bearing; the method is characterized in that:

the external dimensions of the bearing of one type are a bearing internal diameter D, a bearing external diameter D and a bearing height T; the thrust roller diameter Dw1, the thrust roller length L1, the thrust roller number Z1 and the thrust roller half cone angle psi 1 of the adopted thrust tapered roller 5; the adopted centripetal thrust tapered roller 4 has a centripetal roller diameter Dw2, a centripetal roller length L2, a centripetal roller number Z2 and a centripetal roller half cone angle psi 2, and the value ranges of the structural elements are the numerical value ranges in the table 1. TABLE 1

In order to obtain the best effect of the long-life combined bearing for the vertical lathe spindle, the inner diameter D of the bearing, the outer diameter D of the bearing, the height T of the bearing, the diameter Dw1 of the thrust roller, the length L1 of the thrust roller, the number Z1 of the thrust roller and the half cone angle psi 1 of the thrust roller are shown in the table 1; the radial roller diameter Dw2, radial roller length L2, radial roller number Z2, and radial roller half cone angle psi 2 are the values in Table 2.

TABLE 2

The utility model discloses beneficial effect: 1) the high-precision long-life combined bearing with the inner diameter 1220 for the vertical lathe spindle is designed by adopting a rolling bearing limit design method originally invented by the company, and the numerical values of the 8 structural elements are determined according to the external dimension of the bearing. The design realizes that the designed rolling body has the largest diameter and the longest length, the highest rated dynamic load value of the bearing and the longest calculated service life under the condition of meeting the requirements of design strength and process processing, and reduces the use cost of users. 2) A1.6-meter vertical lathe reformed by the company adopts 1 set of combined bearing KHZZ-09 to replace the prior 3 sets of bearings. Not only weight reduction, but also can once fix a position, clamping because of structural change, and the rotation accuracy is high, and processing part radial runout and end face runout are all not more than 0.005 mm.

(IV) description of the drawings

Fig. 1 is a front sectional view of a high-precision long-life combination bearing having an inner diameter 1220 for a vertical lathe main shaft.

Fig. 2 is a shape view of the thrust tapered roller 5.

Fig. 3 is a shape diagram of the angular contact tapered roller 4.

(V) detailed description of the preferred embodiments

Referring to fig. 1, a high-precision long-life combination bearing of an inner diameter 1220 for a main shaft of a vertical lathe is provided with a race 7, an intermediate moving ring 1, a row of Z1 tapered thrust rollers 5 circumferentially arranged between the race and the moving ring and supported by a strut-type cage 3, thereby forming a tapered thrust roller bearing which receives an axial load. An inner ring 2 is provided, and a row of Z2 tapered rollers 4 for centripetal thrust is arranged between the outer raceway of the inner ring and the upper raceway of the middle moving ring in the circumferential direction and supported by a basket-shaped retainer 6, thereby forming a tapered roller bearing for centripetal thrust bearing radial load.

See table 2 and fig. 1, bearing dimensions: the inner diameter D of the bearing is 1220mm, the outer diameter D of the bearing is 1420mm, and the height T of the bearing is 90 mm. The high-precision long-life combined bearing structure element value determined by the rolling bearing limit design method for the vertical lathe spindle is as follows: referring to table 2 and fig. 2, the thrust roller diameter Dw1 was 31.172mm, the thrust roller length L1 was 33.1mm, the number of thrust rollers Z1 per row in the circumferential direction was 80, and the thrust roller half taper angle ψ 1 was 1 ° 18'. Referring to table 2 and fig. 3, the diameter Dw2 of the centripetal roller is 20.606mm, the length L2 of the centripetal roller is 23mm, the number Z2 of the centripetal rollers in each row in the circumferential direction is 110, and the half cone angle ψ 2 of the centripetal roller is 14'.

Claims (2)

1. The high-precision long-life combined bearing with the inner diameter 1220 for the vertical lathe main shaft is provided with a seat ring (7) and a middle moving coil (1), wherein a row of Z1 thrust tapered rollers (5) is circumferentially arranged between the seat ring and the middle moving coil and is supported by a support column type retainer (3); an inner ring (2) is arranged, a row of Z2 centripetal thrust tapered rollers (4) are arranged between the outer raceway of the inner ring and the upper raceway of the middle moving ring in the circumferential direction and are supported by a basket-shaped retainer (6); the method is characterized in that:

the bearing has the overall dimensions of a bearing inner diameter D, a bearing outer diameter D and a bearing height T; the thrust roller diameter Dw1, the thrust roller length L1, the thrust roller number Z1 and the thrust roller half cone angle psi 1 of the adopted thrust tapered roller (5); the adopted centripetal thrust tapered roller (4) has centripetal roller diameter Dw2, centripetal roller length L2, centripetal roller number Z2 and centripetal roller half cone angle psi 2, and the value ranges of the structural elements are within the numerical value ranges of Table 1: TABLE 1

2. A high precision long life composite bearing of inner diameter 1220 for a vertical lathe spindle according to claim 1, characterized in that: the bearing comprises a bearing inner diameter D, a bearing outer diameter D and a bearing height T; the thrust roller diameter Dw1, the thrust roller length L1, the thrust roller number Z1 and the thrust roller half cone angle psi 1 of the adopted thrust tapered roller (5); the adopted centripetal thrust tapered roller (4) has a centripetal roller diameter Dw2, a centripetal roller length L2, a centripetal roller number Z2 and a centripetal roller half cone angle psi 2, and the values of the structural elements are the numerical values in the table 2: TABLE 2

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