CN217044628U - High-precision live center - Google Patents

Abstract

The application relates to a high accuracy live center includes: casing and apex axle, the inside center of casing is the cavity, the casing front end is equipped with the protecgulum, the rear end is equipped with the back lid, apex axle level sets up in the casing cavity, apex axle front end is equipped with the apex that runs through the protecgulum, the apex axle is including the first front axle tip that connects gradually, axle head portion before the second, the transition portion, axle head portion and second rear axle tip after first rear axle tip, first front axle tip front end is equipped with the shaft shoulder, the apex sets up at the shaft shoulder front end, be equipped with the skeleton oil blanket between shaft shoulder and the protecgulum, be equipped with cylindrical roller bearing on the first front axle tip, be equipped with thrust ball bearing on the axle head portion before the second, be equipped with bearing on the first rear axle tip, be equipped with deep groove ball bearing on the second rear axle tip. This application simple structure, rotation accuracy is high, and stability is good, and bearing capacity is strong, and the leakproofness is good.

Description

High-precision live center

Technical Field

The utility model relates to a top technical field, in particular to high accuracy live center.

Background

At present, the center for heavy rolling machinery equipment on the market is mostly a dead center, and although live center technology is also applied in recent years, the center is mostly small equipment and is used for large equipment.

The inner structure that current MOS5# live center adopted the supporting combination of deep groove ball bearing more to constitute, this structure is not high because the rotational accuracy and the bearing capacity of deep groove ball bearing itself, lead to live center rotational accuracy and bearing capacity not high, and current live center is mostly two bearing points to support, two front and back bearing support intervals are less, live center's poor stability and bearing capacity are low, current live center leakproofness is not good moreover, impurity gets into the bearing indoor easily, influence life.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a high accuracy live center, simple structure, rotation accuracy is high, and stability is good, and bearing capacity is strong, and the leakproofness is good.

The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be: a high precision live center comprising:

a shell, the inner center of which is a cavity, the front end of the shell is provided with a front cover, the rear end of the shell is provided with a rear cover,

the center shaft, the level sets up in the casing cavity, and the center shaft front end is equipped with the center head that runs through the protecgulum, the center shaft is including the first front axle tip, the second front axle tip, transition portion, first rear axle tip and the second rear axle tip that connect gradually, first front axle tip front end is equipped with the shaft shoulder, the center head sets up at the shaft shoulder front end, be equipped with the skeleton oil blanket between shaft shoulder and the protecgulum, be equipped with interior raceway on the first front axle tip, be equipped with cylindrical roller bearing in the interior raceway, be equipped with thrust ball bearing on the second front axle tip, be equipped with the fender ring between thrust ball bearing and the first front axle tip, be equipped with bearing on the first rear axle tip, be equipped with deep groove ball bearing on the second rear axle tip, second rear axle tip rear end is equipped with the baffle. This application is through setting up cylindrical roller bearing, thrust ball bearing, needle bearing and deep groove ball bearing become four strong points, compare two point supports in current, stability is better, and thrust ball bearing bears the axial top tight power, this first group bearing of cylindrical roller bearing and thrust ball bearing is big with this second group bearing interval of needle bearing and deep groove ball bearing, thereby the stability and the bearing capacity of apex axle have been improved, and still be equipped with the skeleton oil blanket, prevent the leakage of lubricating oil, the leakproofness has been improved, and can prevent effectively that impurity from entering into the bearing room through apex axle terminal surface gap, service life is prolonged.

Further, the shell comprises a shaft shell positioned at the front end and a conical shell positioned at the rear end of the shaft shell, and the shaft shell and the conical shell are integrally manufactured.

Furthermore, an O-shaped sealing ring is arranged between the front cover and the front end of the shaft shell, and the front cover is connected with the shaft shell through a first bolt. The sealing performance is further improved by arranging the O-shaped sealing ring, and the service life is prolonged.

Furthermore, the diameters of the shaft shoulder, the first front shaft end portion, the second front shaft end portion, the transition portion, the first rear shaft end portion and the second rear shaft end portion are sequentially reduced, the second front shaft end portion comprises a cylindrical section and a conical section connected with the cylindrical section, the cylindrical section is connected with the first front shaft end portion, the diameter of the cylindrical section is smaller than that of the first front shaft end portion, and the small end of the conical section is connected with the transition portion and is the same as that of the transition portion.

Furthermore, a first annular step and a second annular step which are sequentially reduced in radius are sequentially arranged in the shaft shell cavity, the first annular step is used for installing the cylindrical roller bearing, and the second annular step is used for installing the thrust ball bearing.

Further, the baffle is connected with the tail part of the center shaft through a second bolt.

Furthermore, a disc spring is further arranged at the end of the second rear shaft and located between the needle bearing and the deep groove ball bearing. Through setting up belleville spring, can make the apex axle press on thrust ball bearing all the time, improve the precision of bearing fitting surface to increase axial preload through belleville spring, further improved the stability and the bearing capacity of apex axle.

Further, the axes of the shaft housing, the conical shell, the apex shaft and the apex coincide.

Furthermore, a through hole for the tip head to pass through is formed in the front cover.

Drawings

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

fig. 2 is a schematic structural view of the center shaft of the present invention.

The labels in the figure are: 1. the tip shaft, 101, a shaft shoulder, 102, a first front shaft end part, 103, a second front shaft end part, 104, a transition part, 105, a first rear shaft end part, 106, a second rear shaft end part, 2, a tip, 3, a shell, 301, a first annular step, 302, a second annular step, 4, a front cover, 5, a first bolt, 6, a framework oil seal, 7, a cylindrical roller bearing, 8, a baffle ring, 9, a thrust ball bearing, 10, a needle bearing, 11, a deep groove ball bearing, 12, a baffle plate, 13, a rear cover, 14, a second bolt, 15 and a disc spring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that in the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, rather than to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1-2, the present invention provides a high precision live center, including: the hollow shell comprises a shell 3 and a tip shaft 1, wherein the center inside the shell 3 is a cavity, the front end of the shell 3 is provided with a front cover 4, the rear end of the shell is provided with a rear cover 13, the rear cover 13 is fixedly connected with the rear end of the shell through threads, the tip shaft 1 is horizontally arranged in the cavity of the shell 3, the front end of the tip shaft 1 is provided with a tip 2 penetrating through the front cover 4, the tip shaft 1 comprises a first front shaft end part 102, a second front shaft end part 103, a transition part 104, a first rear shaft end part 105 and a second rear shaft end part 106 which are sequentially connected, the front end of the first front shaft end part 102 is provided with a shaft shoulder 101, the tip 2 is arranged at the front end of the shaft shoulder 101, a framework oil seal 6 is arranged between the shaft shoulder 101 and the front cover 4, the first front shaft end part 102 is provided with an inner raceway, the inner raceway is provided with a cylindrical roller bearing 7, the second front shaft end part 103 is provided with a thrust ball bearing 9, and a retaining ring 8 is arranged between the thrust ball bearing 9 and the first front shaft end part 102, the outer diameter of the baffle ring 8 is smaller than the diameter of the first front shaft end 102, a needle bearing 10 is arranged on the first rear shaft end 105, a deep groove ball bearing 11 is arranged on the second rear shaft end 106, a baffle plate 12 is arranged at the rear end of the second rear shaft end 106, and the baffle plate 12 is connected with the tail portion of the center shaft 1 through a second bolt 14.

Wherein, as shown in fig. 1, casing 3 is including the axostylus axostyle shell that is located the front end and the toper casing that is located the axostylus axostyle shell rear end, and axostylus axostyle shell and toper casing are as an organic whole to be made, protecgulum 4 is connected with the axostylus axostyle shell through first bolt 5, the axis coincidence of axostylus axostyle shell, toper casing, apex axle 1 and apex 2, be equipped with the through-hole that is used for apex 2 to pass through on the protecgulum 4, the through-hole is located protecgulum 4 center, the axis coincidence of the axis of through-hole and apex axle 1.

Specifically, as shown in fig. 1 and fig. 2, the diameters of the shoulder 101, the first front shaft end 102, the second front shaft end 103, the transition portion 104, the first rear shaft end 105, and the second rear shaft end 106 are sequentially reduced, the second front shaft end 103 includes a cylindrical section and a conical section connected to the cylindrical section, the cylindrical section is connected to the first front shaft end 102, the diameter of the cylindrical section is smaller than that of the first front shaft end 102, the large end of the conical section is connected to the cylindrical section and is equal to the diameter of the cylindrical section, and the small end of the conical section is connected to the transition portion 104 and is equal to that of the transition portion 104.

More specifically, as shown in fig. 1, a first annular step 301 and a second annular step 302 with successively reduced radii are sequentially arranged in the cavity of the shaft housing, the first annular step 301 is used for installing the cylindrical roller bearing 7, the second annular step 302 is used for installing the thrust ball bearing 9, the cylindrical roller bearing 7 and the thrust ball bearing 9 can be conveniently installed by arranging the first annular step 301 and the second annular step 302, and the bearing installation precision is improved.

As shown in fig. 1, the second rear shaft end 106 is further provided with a disc spring 15, the disc spring 15 is positioned between the needle roller bearing 10 and the deep groove ball bearing 11, and the accuracy of the bearing fitting surface can be improved by providing the disc spring 15 so that the nose shaft 1 is always pressed against the thrust ball bearing 9.

Of course, the present invention is not limited to the above-described embodiments, and several other embodiments based on the design concept of the present invention are provided below.

For example, in other embodiments, unlike the above-described embodiments, as shown in fig. 1, an O-ring is disposed between the front cover 4 and the front end of the shaft housing, so that the sealing performance is further improved by disposing the O-ring, impurities are prevented from entering the bearing chamber, and the service life of the bearing is prolonged.

It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments, and any simple modification, equivalent change and modification made to the above embodiments by the technical essence of the present invention all fall into the protection scope of the present invention.

Claims (9)

1. A high precision live center, comprising:

a shell (3), the inner center of which is a cavity, the front end of the shell (3) is provided with a front cover (4), the rear end is provided with a rear cover (13),

the center shaft (1) is horizontally arranged in a cavity of the shell (3), the front end of the center shaft (1) is provided with a center point (2) penetrating through the front cover (4), the center shaft (1) comprises a first front shaft end part (102), a second front shaft end part (103), a transition part (104), a first rear shaft end part (105) and a second rear shaft end part (106) which are sequentially connected, the front end of the first front shaft end part (102) is provided with a shaft shoulder (101), the center point (2) is arranged at the front end of the shaft shoulder (101), a framework oil seal (6) is arranged between the shaft shoulder (101) and the front cover (4), an inner roller path is arranged on the first front shaft end part (102), a cylindrical roller bearing (7) is arranged in the inner roller path, a thrust ball bearing (9) is arranged on the second front shaft end part (103), a retainer ring (8) is arranged between the thrust ball bearing (9) and the first front shaft end part (102), and a needle roller bearing (10) is arranged on the first rear shaft end part (105), a deep groove ball bearing (11) is arranged on the second rear shaft end portion (106), and a baffle plate (12) is arranged at the rear end of the second rear shaft end portion (106).

2. A high precision live center according to claim 1, wherein: the shell (3) comprises a shaft shell positioned at the front end and a conical shell positioned at the rear end of the shaft shell, and the shaft shell and the conical shell are integrally manufactured.

3. A high precision live center according to claim 2, wherein: an O-shaped sealing ring is arranged between the front cover (4) and the front end of the shaft shell, and the front cover (4) is connected with the shaft shell through a first bolt (5).

4. A high precision live center according to claim 1, wherein: the diameters of the shaft shoulder (101), the first front shaft end portion (102), the second front shaft end portion (103), the transition portion (104), the first rear shaft end portion (105) and the second rear shaft end portion (106) are sequentially reduced, the second front shaft end portion (103) comprises a cylindrical section and a conical section connected with the cylindrical section, the cylindrical section is connected with the first front shaft end portion (102), the diameter of the cylindrical section is smaller than that of the first front shaft end portion (102), and the small end of the conical section is connected with the transition portion (104) and is the same as that of the transition portion (104).

5. A high precision live center according to claim 2, wherein: be equipped with first annular step (301) and second annular step (302) that the radius reduces in proper order in the axle housing cavity, first annular step (301) are used for installing cylindrical roller bearing (7), second annular step (302) are used for installing thrust ball bearing (9).

6. A high precision live center according to claim 1, wherein: the baffle (12) is connected with the tail part of the center shaft (1) through a second bolt (14).

7. A high precision live center according to claim 1, wherein: and a disc spring (15) is further arranged on the second rear shaft end portion (106), and the disc spring (15) is located between the needle bearing (10) and the deep groove ball bearing (11).

8. A high precision live center according to claim 2, wherein: the axes of the shaft shell, the conical shell, the center shaft (1) and the center (2) are superposed.

9. A high precision live center according to claim 1, wherein: the front cover (4) is provided with a through hole for the ejector point head (2) to pass through.

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