CN217044627U - Live center with high rotation precision - Google Patents
Live center with high rotation precision Download PDFInfo
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- CN217044627U CN217044627U CN202220716192.6U CN202220716192U CN217044627U CN 217044627 U CN217044627 U CN 217044627U CN 202220716192 U CN202220716192 U CN 202220716192U CN 217044627 U CN217044627 U CN 217044627U
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- ball bearing
- center
- shell
- end cover
- angular contact
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Abstract
A live center with high rotation precision comprises a shell, a front end cover, a rear end cover and a center body, wherein a center shaft of the center body is rotatably supported in an installation space formed by the shell, the front end cover and the rear end cover, and a center head of the center body is exposed out of the center of the front end cover; the front end of the center shaft is used as a supporting part and is rotationally supported on the inner wall of the shell through an angular contact ball bearing and a thrust ball bearing which are axially arranged side by side, and the angular contact ball bearing is positioned in front of the thrust ball bearing; the rear end of the center shaft is used as a balance part and is rotatably supported on the inner wall of the shell through a needle bearing; the front end cover is installed at the front end of the shell, and the pre-tightening force of the angular contact ball bearing is adjusted through the compression degree of the front end cover. The utility model discloses an optimization to shell inner bearing improves the rotational accuracy of apical axis, satisfies the part machining required precision.
Description
Technical Field
The utility model belongs to the technical field of machining, concretely relates to live center of high rotation accuracy.
Background
The live center on the current market mainly comprises the following structures: the center shaft is rotatably supported in a cavity inside the shell, and the center shaft is rotatably supported in the shell by a plurality of bearings. The bearing in the live center plays an important role in live center work, so how to use the bearing affects the precision and the service performance of the live center. The live center has the advantages that the rotating precision of the center shaft cannot meet the requirement of part machining precision due to unbalanced bearing stress and play in the working process, the problems that parts of the live center are prone to abrasion, short in service life, low in cutting efficiency and the like are caused, the limit rotating speed of the live center can be restricted, and the application requirement of a high-rotating-speed machining center cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a live center of high rotation accuracy through the optimization to shell inner bearing, improves the rotation accuracy of apex axle, satisfies the part machining required precision.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a live center with high rotation precision comprises a shell, a front end cover, a rear end cover and a center body, wherein a center shaft of the center body is rotatably supported in an installation space formed by the shell, the front end cover and the rear end cover, and a center head of the center body is exposed out of the center of the front end cover; the front end of the center shaft is used as a supporting part and is rotationally supported on the inner wall of the shell through an angular contact ball bearing and a thrust ball bearing which are axially arranged side by side, and the angular contact ball bearing is positioned in front of the thrust ball bearing; the rear end of the center shaft is used as a balance part and is rotatably supported on the inner wall of the shell through a needle bearing; the front end cover is installed at the front end of the shell, and the pre-tightening force of the angular contact ball bearing is adjusted through the compression degree of the front end cover.
The angular contact ball bearing adopts a double-row angular contact ball bearing.
The inner wall of the front end of the shell, which is used for mounting the angular contact ball bearing, is provided with an annular first positioning boss, the rear end face of the angular contact ball bearing abuts against the first positioning boss, the front end cover is provided with a positioning ring extending into the shell, and the positioning ring abuts against the front end face of the angular contact ball bearing.
The inner wall of the front end of the shell, which is used for installing the thrust ball bearing, is provided with an annular second positioning boss, the rear end face of the thrust ball bearing abuts against the second positioning boss, and an axial force transmission gasket is further arranged between the angular contact ball bearing and the thrust ball bearing.
And a sealing structure is arranged between the part of the center shaft, which is exposed out of the shell, and the front end cover.
The sealing structure adopts a framework oil seal.
The inner hole of the front end cover is provided with an annular flange extending radially towards the circle center, and the annular flange, the axial surface of the tip shaft and the hole wall of the inner hole of the front end cover enclose an installation space for installing the framework oil seal.
The utility model has the advantages that: the utility model discloses adopt the structure of biserial angular contact ball bearing and the supporting use of thrust ball bearing at the supporting part of apical axis, wherein biserial angular contact ball bearing both can bear radial force, can bear the axial force again, makes biserial angular contact ball bearing be in the pretension state through the packing force of adjustment front end housing again like this. Thereby achieving the purpose of improving the rotation precision and the rotation speed; meanwhile, the matched thrust ball bearing can bear higher axial force; therefore, in the combined bearing structure, the radial runout can be reduced, the rotation precision is improved, and the axial bearing capacity of the live center can be met. The utility model discloses the supporting one set of bearing that sets up of balancing unit at the afterbody of apex axle for the rotation of apex axle provides balancedly for the live center is whole to be in steady operational environment, further ensures that the live center has higher rotation accuracy.
Drawings
FIG. 1 is a schematic view of the present invention;
the labels in the figure are: 1. the device comprises a shell, 2, a needle bearing, 3, a balance part, 4, a tip shaft, 5, a second positioning boss, 6, a thrust ball bearing, 7, an axial force transmission gasket, 8, a double-row angular contact ball bearing, 9, a front end cover, 10, a framework oil seal, 11, a radial boss, 12, a tip head, 13, an annular flange, 14, a supporting part, 15, a first positioning boss, 16, a conical surface, 17 and a rear end cover.
Detailed Description
The following detailed description of the present invention is made with reference to the accompanying drawings and examples, but not to be construed as a limitation of the present invention.
A live center with high rotation precision comprises a shell 1, a front end cover 9, a rear end cover 17, a center shaft 4, a center 12 and a plurality of bearings for supporting the center shaft 4.
The shell 1 is an axial hollow structure with openings at two ends, the front end and the rear end are respectively provided with a front end cover 9 and a rear end cover 17 through screws, and an axial cavity in the shell 1 is used for installing the center shaft 4 and a bearing. The external diameter and the internal diameter of 1 anterior segment of shell all are greater than the external diameter and the internal diameter of 1 back end of shell, set up twice annular boss along the axial in the past backward on the internal diameter face of 1 anterior segment of shell, are first location boss 15 and second location boss 5 respectively, and 1 back end of shell is the taper shank, and its external diameter face sets up to conical surface 16, is convenient for install live center in the conical hole of lathe.
The front section of the tip shaft 4 is a large-diameter support part 14, and the rear section is a small-diameter balance part 3. The large-diameter support part 4 is used for mounting a double-row angular contact ball bearing 8 and a thrust ball bearing 6, furthermore, the large-diameter support part 4 is also arranged into two sections with different diameters, the large-diameter part is mounted with the double-row angular contact ball bearing 8, the small-diameter part is mounted with the thrust ball bearing 6 and an axial force transmission gasket 7 positioned between the thrust ball bearing 6 and the double-row angular contact ball bearing 8; the front end face of the outer ring of the double-row angular contact ball bearing 8 is abutted against a positioning ring which is arranged on the front end cover 9 and extends into the shell 1, the rear end face of the outer ring of the double-row angular contact ball bearing 8 is abutted against the first positioning boss 15, so that the axial positioning of the double-row angular contact ball bearing 8 is realized, the front end face of the inner ring of the double-row angular contact ball bearing 8 is abutted against the end part of a radial boss 11 of the center shaft 4, the rear end face of the inner ring of the double-row angular contact ball bearing 8 is abutted against the axial force transmission gasket 7, and the axial pre-tightening degree of the double-row angular contact ball bearing 8 can be adjusted by adjusting the pressing force of the front end cover 9; the front end surface of the thrust ball bearing 6 is abutted against the axial force transmission gasket 7, and the rear end surface is abutted against the second positioning boss 5.
A set of needle roller bearings 2 are arranged between the balance part 3 at the rear section of the center shaft 4 and the shell 1 so as to improve the overall balance of the center shaft 4.
The front end cover 9 is provided with an inner hole for extending the ejector point head 12, the front end of the inner hole is provided with an annular flange 13 extending radially towards the circle center, the annular flange 13, a radial boss 11 at the front section of the ejector point shaft 4 and the inner hole wall of the front end cover 9 enclose an installation space for installing a sealing structure, and the sealing structure can adopt a framework oil seal 10 to prevent the leakage of lubricating oil and the entering of external grinding fluid and sundries into the shell.
The utility model discloses use the apical peak of live center as preceding, the apical peak axle is the back, and other structural expressions about "preceding", "back" also use this as the reference.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the embodiments of the present invention can be modified or replaced with equivalents with reference to the above embodiments, and any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are all within the scope of the claims of the present application.
Claims (7)
1. The utility model provides a live center of high rotational accuracy, includes shell, front end housing, rear end cap and top body, its characterized in that: the center shaft of the center body is rotatably supported in a mounting space formed by the shell, the front end cover and the rear end cover, and the center of the center body is exposed out of the center of the front end cover; the front end of the tip shaft serves as a supporting part and is rotatably supported on the inner wall of the shell through an angular contact ball bearing and a thrust ball bearing which are axially arranged side by side, and the angular contact ball bearing is positioned in front of the thrust ball bearing; the rear end of the center shaft is used as a balance part and is rotatably supported on the inner wall of the shell through a needle bearing; the front end cover is installed at the front end of the shell, and the pre-tightening force of the angular contact ball bearing is adjusted through the compression degree of the front end cover.
2. A live center with high rotational accuracy as set forth in claim 1, wherein: the angular contact ball bearing adopts a double-row angular contact ball bearing.
3. A live center with high rotational accuracy as set forth in claim 1, wherein: the inner wall of the front end of the shell, which is used for mounting the angular contact ball bearing, is provided with an annular first positioning boss, the rear end face of the angular contact ball bearing abuts against the first positioning boss, the front end cover is provided with a positioning ring extending into the shell, and the positioning ring abuts against the front end face of the angular contact ball bearing.
4. A live center with high rotational accuracy as set forth in claim 3, wherein: the inner wall of the front end of the shell, which is used for installing the thrust ball bearing, is provided with an annular second positioning boss, the rear end face of the thrust ball bearing abuts against the second positioning boss, and an axial force transmission gasket is further arranged between the angular contact ball bearing and the thrust ball bearing.
5. A live center with high rotational accuracy as set forth in claim 1, wherein: and a sealing structure is arranged between the part of the tip shaft, which is exposed out of the shell, and the front end cover.
6. A live center with high rotational accuracy according to claim 5, wherein: the sealing structure adopts a framework oil seal.
7. A live center with high rotational accuracy as set forth in claim 6, wherein: the inner hole of the front end cover is provided with an annular flange extending radially towards the circle center, and the annular flange, the axial surface of the tip shaft and the hole wall of the inner hole of the front end cover enclose an installation space for installing the framework oil seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220716192.6U CN217044627U (en) | 2022-03-30 | 2022-03-30 | Live center with high rotation precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220716192.6U CN217044627U (en) | 2022-03-30 | 2022-03-30 | Live center with high rotation precision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217044627U true CN217044627U (en) | 2022-07-26 |
Family
ID=82467328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220716192.6U Active CN217044627U (en) | 2022-03-30 | 2022-03-30 | Live center with high rotation precision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217044627U (en) |
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2022
- 2022-03-30 CN CN202220716192.6U patent/CN217044627U/en active Active
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