CN2865938Y - Small size high-speed main-spindle bearing constant pressure prtightening device - Google Patents
Small size high-speed main-spindle bearing constant pressure prtightening device Download PDFInfo
- Publication number
- CN2865938Y CN2865938Y CN 200620101508 CN200620101508U CN2865938Y CN 2865938 Y CN2865938 Y CN 2865938Y CN 200620101508 CN200620101508 CN 200620101508 CN 200620101508 U CN200620101508 U CN 200620101508U CN 2865938 Y CN2865938 Y CN 2865938Y
- Authority
- CN
- China
- Prior art keywords
- bearing
- axle sleeve
- spring
- shaft liner
- slip cap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses a small high speed main axis bearing constant pressure pre-tightening unit. Its first and second bearings are placed in the holes at the two ends of shaft liner. The main axis is installed in the first bearing and the second bearing. The nut at axis end positions the main axis and the second bearing in shaft liner. Bushing is set inside shaft liner, whose one end outside edge is clamped to shaft liner ladder hole and positioned by the second bearing cup while the other end is installed with spring seat containing spring. One end of spring seat leans against checking and elastic damping ring of spring. The elastic damping ring is embedded into sliding sleeve. The sliding sleeve is set between the first bearing and shaft liner. Moreover, the sliding sleeve is in interference fit with the first bearing cup and in clearance fit with shaft liner. The utility model can convert the thrusting force on two sets of bearings by spring with original technology into tensile force, so as to improve the stability of main axis system. Moreover, axial movement compensation, increase of sliding contact area and higher supporting rigidity can be realized with the slide sleeve set between bearing and shaft liner.
Description
Technical field
The utility model relates to a kind of small high-speed constant-pressure prepressing apparatus of main bearing.
Background technology
The main shaft that requires in the miniature high-speed machining tool to run up has enough rigidity to bear radial and axial load, for satisfying the requirement of spindle operation precision and rigidity, need axis system to have dynamic balancing preferably, but main shaft is in high-speed cruising, and the bearing possibility occurs stuck owing to the spindle heat generation distortion and directly influences operate as normal.
The firmly beforehand means that existing main shaft bearing adopts is divided into location pretension and level pressure pretension, the location firmly beforehand means is located two bearings in bearing holder (housing, cover), simple in structure, convenient disassembly, if but the main shaft high-speed cruising, the temperature rise meeting of bearing makes elongation strain axially takes place, cause that bearing is stuck to be burnt even, and changed the computing ballance correction of axis system, produce the negative effect that main axis stiffness descends and running accuracy reduces, so the location firmly beforehand means is only applicable to the low speed axis system; The level pressure pretension can be realized running up of main shaft, and pretension adopts cylindrical spring or hydraulic pressure rib to carry out the level pressure pretension, adds axial elongation by camber of spring to eliminate temperature rise.
As shown in Figure 1 be level pressure pre-tightening apparatus habitual in the prior art, with nut two groups of bearings 1 and bearing 11 are limited among the axle sleeve 10 on former and later two end caps, axle sleeve 10 has a plurality of grooves to cooperate two groups of bearings, one end of spring base 4 passes through spring 5 roof pressures on mobile bearing 1, an other end is subjected to the axial thrust effect of spring 5 near 10, two groups of bearings of axle sleeve by back-up ring.But the level pressure pre-tightening apparatus of prior art, normal employing nut or other securing member on axle, place axle sleeve with location bearing and mobile bearing with bearing fixing, and spring base leans the mobile bearing cycle surface, spring one end holddown spring seat, other end roof pressure is on axle sleeve.Main shaft is in rotating at a high speed, the caused amount of unbalance of a plurality of screw threads offered for securing member on the main shaft or groove is the rigidity and the fatigue life of influence axle system directly, and when bearing outer ring axially slides in axle sleeve, bearing heating can influence fit clearance and produce the axial elongation distortion, and then influence rigidity, load-carrying ability and the high speed of machine-tool spindle system, so need the more rational pretension method and structure of research with in the axis system that is applied to miniature high-speed machinery.
Summary of the invention
In order to overcome the deficiency of pre-tightening apparatus in the prior art high-speed main spindle system, the purpose of this utility model is to provide reliable operation, the simple a kind of small high-speed constant-pressure prepressing apparatus of main bearing of assembling.
The purpose technical scheme that its technical problem that solves the utility model adopts is: comprise the clutch shaft bearing and second bearing that place in axle sleeve two stomidiums, main shaft is contained in the clutch shaft bearing and second bearing, and shaft end nut is positioned the main shaft and second bearing in the axle sleeve.Also be provided with lining in the axle sleeve, the outer of lining one end is stuck in the shoulder hole of axle sleeve and by second bearing outer ring and compresses the location, the lining other end is equipped with spring base, spring places spring base, one end of spring base leans check ring and circlip, and circlip embeds slip cap, and slip cap is located between clutch shaft bearing bearing and the axle sleeve, slip cap and clutch shaft bearing outer ring are interference fit, are matched in clearance between slip cap and the axle sleeve.
The utility model is embodied in respect to the beneficial effect of prior art:
1, the utility model is converted into pulling force with the thrust to bearing outer ring that original level pressure pre-tightening apparatus is produced, can avoid adopting nut or other securing member rigid bearing, thereby eliminate by screw thread on the axis body or the caused amount of unbalance of groove, make the axis system reliable and stable work;
2, can realize moving axially with the slip cap that bearing connects firmly mutually by interference fit, thereby can avoid bearing stuck to axis system running up down because the caused axial elongation of temperature rise compensates; Simultaneously, with the employing matched in clearance structure that bearing directly is installed in the axle sleeve is compared, the utility model is realized bearing endwisely slipping in axle sleeve by slip cap, can increase the sliding-contact area, thereby can obtain higher support stiffness under the identical situation of fit clearance;
3, slip cap is located between axle sleeve and the bearing, play the effect of transition, with respect to directly utilize bearing outer ring in axle sleeve in axial sliding structure compare, the utility model can reduce the influence of bearing heating to fit clearance, thereby allow to adopt less fit clearance between slip cap and the axle sleeve, help reducing the vibration of system;
4, except that axis body itself, bearing inner race and assembly thereof, other parts are non-rotating, can reduce the number of parts with high-precision requirement, and then can reduce axis system is carried out dynamically balanced workload.
The miniature high-speed machinery that the utility model is applied to mainly to bear radial load is as the constant-pressure prepressing apparatus of main bearing of high-speed numeric control coil winding machine etc.
Description of drawings
Fig. 1 is the structural principle schematic diagram of existing small high-speed constant-pressure prepressing apparatus of main bearing;
Fig. 2 is a structural principle schematic diagram of the present utility model;
Fig. 3 is the another kind of structural principle schematic diagram of slip cap of the present utility model.
Among the figure: 1, bearing, 2, slip cap, 2.1, screwed hole, 2.2, cannelure, 3, stop nut, 4, spring base, 5, spring, 6, check ring, 7, circlip, 8, main shaft, 9, lining, 10, axle sleeve, 11, bearing, 12, shaft end nut.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, 2, 3, the utility model comprises the clutch shaft bearing 1 and second bearing 11 that places in 10 liang of stomidiums of axle sleeve, and main shaft 8 is contained in the clutch shaft bearing 1 and second bearing 11, and shaft end nut 12 is positioned the main shaft 8 and second bearing 11 in the axle sleeve 10.Also be provided with lining 9 in the axle sleeve 10, the outer of lining 9 one ends is stuck in the shoulder hole of axle sleeve 10 and by second bearing, 11 outer rings and compresses the location, lining 9 other ends are equipped with spring base 4, spring 5 places spring base 4, one end of spring base 4 leans check ring 6 and circlip 7, and circlip 7 embeds slip cap 2, and slip cap 2 is located between clutch shaft bearing bearing 1 and the axle sleeve 10, slip cap 2 is an interference fit with clutch shaft bearing 1 outer ring, is matched in clearance between slip cap 2 and the axle sleeve 10.
Described slip cap 2 outer cylinder surfaces are provided with at least one annular groove 2.2.The described clutch shaft bearing 1 and second bearing 11 are deep groove ball bearing or the face-to-face angular contact ball bearing of installing.
The level pressure pre-tightening apparatus that the utility model provides with the movable terminal bearing 1 of main shaft 8 by interference fit place can be in axle sleeve 10 along main shaft in axial sliding in the slip cap 2; Spring base 4 is fixed on the lining 9 by screw thread, slip cap 2 is by parts and lining 10 realization resilient connection such as spring base 4, spring 5, check ring 6 and circlips 7, and the pretension assembly integral body that shaft end nut 12 finishes assemblings such as axle 8, the bearing 1 and 11 of locating, lining 9 is pressed into axle sleeve 10 and is positioned wherein; Because lining 9 is positioned in the axle sleeve 10, when spring 5 is compressed under shaft end nut 12 effects, acting force of the spring to the right is delivered on the slip cap 2 by check ring 6 and circlip 7 successively vertically, and then the outer ring that makes bearing 1 is subjected to active force to the right, finally makes mobile bearing 1 and location bearing 11 obtain pretension simultaneously.
The utility model utilizes the space between the bearings, the thrust to bearing outer ring that the level pressure pre-tightening apparatus that is usually located between the two bearings is produced is converted into pulling force, can save nut or other securing member rigid bearing, thereby avoid by the screw thread on the main shaft or the caused amount of unbalance of groove and to the weakening of axis body rigidity and fatigue life.
Slip cap 2 adopts the microgap to cooperate to realize slip cap 2 moving axially in axle sleeve 10 with axle sleeve 10, slip cap 2 connects firmly by interference fit mutually with bearing 1 outer ring, the integral body that can realize slip cap 2 moves axially, thereby can avoid bearing stuck to axis system running up down because the caused axial elongation of temperature rise compensates.
Further, increase one or several cannelures 2.2 in slip cap 2 outer cylinder surface appropriate locations, this improvement structure can reduce the resistance to sliding between slip cap and the axle sleeve; By in cannelure, filling moderate lubrication fat, can further reduce sliding-frictional resistance and increase supporting damping; According to actual layout, quantity, groove width and the groove depth that requires to select groove of equipment, can regulate the support stiffness of bearings system, thereby be convenient to according to actual needs the support system dynamics be controlled.
Described spring base 4 is fixed in lining 9 by screw thread, and it is fixing also can to increase stop nut 3.Spring base 4 has spring eye, can be with the spring 5 stable holes that place.
The angular contact ball bearing that two groups of above-mentioned bearings can be deep groove ball bearing or install face-to-face, bearing adopts grease lubrication.Described slip cap 2 bottom design have four screwed holes 2.1 in order to dismounting bearing 1.
Claims (3)
1. small high-speed constant-pressure prepressing apparatus of main bearing, comprise the clutch shaft bearing (1) and second bearing (11) that place in axle sleeve (10) two stomidiums, main shaft (8) is contained in clutch shaft bearing (1) and second bearing (11), shaft end nut (12) is positioned main shaft (8) and second bearing (11) in the axle sleeve (10), it is characterized in that: also be provided with lining (9) in the axle sleeve (10), the outer of lining (9) one ends is stuck in the shoulder hole of axle sleeve (10) and by second bearing (11) outer ring and compresses the location, lining (9) other end is equipped with spring base (4), spring (5) places spring base (4), one end of spring base (4) leans check ring (6) and circlip (7), circlip (7) embeds slip cap (2), slip cap (2) is located between clutch shaft bearing bearing (1) and the axle sleeve (10), slip cap (2) is an interference fit with clutch shaft bearing (1) outer ring, is matched in clearance between slip cap (2) and the axle sleeve (10).
2. a kind of small high-speed constant-pressure prepressing apparatus of main bearing according to claim 1 is characterized in that: described slip cap (2) outer cylinder surface is provided with at least one cannelure (2.2).
3. a kind of small high-speed constant-pressure prepressing apparatus of main bearing according to claim 1 is characterized in that: described clutch shaft bearing (1) and second bearing (11) are deep groove ball bearing or the face-to-face angular contact ball bearing of installing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620101508 CN2865938Y (en) | 2006-03-08 | 2006-03-08 | Small size high-speed main-spindle bearing constant pressure prtightening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620101508 CN2865938Y (en) | 2006-03-08 | 2006-03-08 | Small size high-speed main-spindle bearing constant pressure prtightening device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2865938Y true CN2865938Y (en) | 2007-02-07 |
Family
ID=37701639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620101508 Expired - Lifetime CN2865938Y (en) | 2006-03-08 | 2006-03-08 | Small size high-speed main-spindle bearing constant pressure prtightening device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2865938Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368126C (en) * | 2006-03-08 | 2008-02-13 | 浙江大学 | Small high-speed constant-pressure prepressing apparatus of main bearing |
| CN101982665A (en) * | 2010-09-02 | 2011-03-02 | 阀安格水处理系统(太仓)有限公司 | Structure utilizing single direction thrust bearing |
| CN102141081A (en) * | 2011-02-12 | 2011-08-03 | 四川达宇特种车辆制造厂 | Miniature engine rotor bearing pre-tightening system |
| CN111140592A (en) * | 2019-12-25 | 2020-05-12 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Mechanical anti-twisting device of dual-redundancy linear displacement sensor |
| CN112792369A (en) * | 2021-02-09 | 2021-05-14 | 广州市昊志机电股份有限公司 | Electric spindle and machine tool |
-
2006
- 2006-03-08 CN CN 200620101508 patent/CN2865938Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368126C (en) * | 2006-03-08 | 2008-02-13 | 浙江大学 | Small high-speed constant-pressure prepressing apparatus of main bearing |
| CN101982665A (en) * | 2010-09-02 | 2011-03-02 | 阀安格水处理系统(太仓)有限公司 | Structure utilizing single direction thrust bearing |
| CN102141081A (en) * | 2011-02-12 | 2011-08-03 | 四川达宇特种车辆制造厂 | Miniature engine rotor bearing pre-tightening system |
| CN111140592A (en) * | 2019-12-25 | 2020-05-12 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Mechanical anti-twisting device of dual-redundancy linear displacement sensor |
| CN112792369A (en) * | 2021-02-09 | 2021-05-14 | 广州市昊志机电股份有限公司 | Electric spindle and machine tool |
| CN112792369B (en) * | 2021-02-09 | 2022-04-29 | 广州市昊志机电股份有限公司 | Electric spindle and machine tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080213 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |