DE4232563B4 - Rolling bearing for mounting a machine tool spindle - Google Patents

Rolling bearing for mounting a machine tool spindle Download PDF

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Publication number
DE4232563B4
DE4232563B4 DE19924232563 DE4232563A DE4232563B4 DE 4232563 B4 DE4232563 B4 DE 4232563B4 DE 19924232563 DE19924232563 DE 19924232563 DE 4232563 A DE4232563 A DE 4232563A DE 4232563 B4 DE4232563 B4 DE 4232563B4
Authority
DE
Germany
Prior art keywords
ring
rolling
spindle
bearing
damping
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 - Fee Related
Application number
DE19924232563
Other languages
German (de)
Other versions
DE4232563A1 (en
Inventor
Francisco Rippollés Ortiz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to DE19924232563 priority Critical patent/DE4232563B4/en
Publication of DE4232563A1 publication Critical patent/DE4232563A1/en
Application granted granted Critical
Publication of DE4232563B4 publication Critical patent/DE4232563B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/023Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
    • F16F15/0237Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means involving squeeze-film damping
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/70Stationary or movable members for carrying working-spindles for attachment of tools or work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0032Arrangements for preventing or isolating vibrations in parts of the machine
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/381Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with at least one row for radial load in combination with at least one row for axial load
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C21/00Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/04Ball or roller bearings, e.g. with resilient rolling bodies
    • F16C27/045Ball or roller bearings, e.g. with resilient rolling bodies with a fluid film, e.g. squeeze film damping
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30Parts of ball or roller bearings
    • F16C33/66Special parts or details in view of lubrication
    • F16C33/6637Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6659Details of supply of the liquid to the bearing, e.g. passages or nozzles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00Apparatus used in shaping articles
    • F16C2322/39General build up of machine tools, e.g. spindles, slides, actuators

Abstract

roller bearing (1) for supporting a machine tool spindle (2) consisting of an outer ring (3) and an inner ring (4), between which preferably cylindrical Rolling elements (7) unroll and in which between the end faces of the outer ring (3) on the one hand and spaced from these and connected to the spindle (2) Rolling shaft (6) on the other rolling elements (5), wherein the Shaft washers (6) for adjusting their preload on the spindle (2) are arranged displaceably, characterized in that the radial and axial extent of outer ring (3) and wave washers (6) are coordinated so that between the faces of the outer ring (3) and the wave washers (6) creates a damping gap (10), the one about feed channel (14) in the outer ring (3) with damping fluid can be acted upon, wherein on the inside of the outer ring (3) in its edge region annular grooves (15) for receiving Rolling elements (5) are arranged.

Description

  • The The invention relates to a rolling bearing for mounting a machine tool spindle, consisting of a outer ring and an inner ring, between which roll preferably cylindrical rolling elements, and between the end faces of the outer ring on the one hand and at a distance from these and arranged with the spindle on the other hand roll rolling elements, wherein the wave washers slidably arranged for adjusting their bias on the spindle are.
  • One For example, such a combined needle-axial cylindrical roller bearing plays in the storage of Wälzschraubtrieben a significant role. These are two-sided Axial roller bearings whose intermediate disc at the same time the outer ring a radial needle bearing forms. Such bearings are usually arranged at the ends of threaded spindles on paragraphs adjoining the spindle thread, wherein the one wave washer applies against the spindle shoulder, while the second wave washer by means of a fitting against them threaded nut is hired in a special thread on the shaft shoulder engages (INA reprint from "Antriebstechnik", issue 10, October 1990).
  • In This connection is also known that in machine tool in Feed direction acting axial vibrations as shocks the spindle and thus on the machining tool or on the Transfer tool table and thereby inaccuracies in the surface quality of the machined workpiece or lead to positioning inaccuracies of the tool table.
  • Damping measures for reducing vibrations are also known in the machine tool industry. For example, in the DE 72 01 256 U an arrangement for the storage of axles or shafts in housings, in particular a spindle bearing for machine tools described. In this case, a trained as a stepped sleeve, Ölbeaufschlagte damping bushing is used, which is characterized in that the stepped sleeve on the outer periphery formed by a collar provided at both ends, annular recess which is filled through a bore with oil, which acts as a damping medium here.
  • Of the Disadvantage of such an arrangement is that on the one hand only vibrations are damped in the radial direction and on the other hand a relatively large one axial space required becomes.
  • Also from the DE 41 05 982 C1 a spindle bearing for a machine tool is known in which a further center bearing is arranged between a front and a rear spindle bearing. This center bearing is accommodated by a bushing, wherein between this bushing and a housing accommodating these an oil-filled damping gap is formed. This bearing arrangement damps only vibrations in the radial direction.
  • It is therefore an object of the invention to develop a rolling bearing, in the acting vibrations in the axial direction to adjacent Parts are not transmitted or only steamed become. Furthermore should the damping measure only little additional Take up space.
  • According to the invention this Task according to the features of the characterizing part of claim 1 solved.
  • By the between the front surfaces of the outer ring and the wave gaps formed damping gaps is achieved that vibrations in Feed direction of the spindle are transmitted only attenuated. At a triggered by vibrations axial movement of outer ring and wave washers against each other occurs in the with damping fluid filled damping gaps a steaming Squeezing effect based on the squeeze effect.
  • A such vibration damping affects when using a main or feed screw in one Machine tool positively to the surface quality of the parts to be machined as well as with regard to tool life and positioning accuracy of the tool table.
  • One Another advantage is the fact that the damping effect with its own Components of the rolling bearing is realized. These are bearing outer ring and shaft washers in their dimensions only slightly to enlarge, so that comparatively little Space in the radial and axial direction is needed.
  • By the inclusion of rolling elements in annular Grooves of the outer ring roll this between the wave washers and through the annular groove reset Part of the end faces of the outer ring from. The damping gap or the attenuation gaps In this case, the faces of the outer ring and the wave washers educated.
  • Further advantageous embodiments of the invention are in the dependent claims 2 to 5 explained.
  • So should according to claim 2 for an effective damping the damping gap have a width of 0.02 to 0.03 mm. The smaller the damping gap is, the bigger it gets the damping, because in the damping equation for one Squeeze film dampers the film width is in the third power in the denominator.
  • Out Claim 3 shows that the feed channel for the damping fluid in the middle of the outer ring should be arranged. As a result, a uniform admission of both damping gaps with damping fluid secured.
  • In preferred development of the invention according to claim 4 is provided that the damping fluid consists of the oil used for the lubrication of the rolling elements.
  • To an additional Another feature of the invention according to claim 5 to the End faces of the outer ring Spacers are arranged, which are connected to the outer surface of the outer ring to lock and in the direction of the bearing center so far rich that between the end faces of the outer ring and the rolling elements arranged rolling elements can roll freely.
  • at this embodiment The invention requires the outer ring Although not with circular Grooves are provided, however, it is the preparation of separate Spacers required. The damping gap is in this Fall from the wave washers and one end face of the spacer rings educated.
  • The Invention will be explained in more detail in the following embodiment. It demonstrate:
  • 1 a longitudinal section through a bearing for a feed screw of a machine tool with inventive bearing damping;
  • 2 a longitudinal section through a bearing for a feed screw of a machine tool with inventive bearing damping in a modified embodiment.
  • Out 1 is the storage of a feed screw 2 a machine tool in a combined needle-axial cylindrical roller bearing 1 seen. It is a two-sided axial roller bearing consisting of two shaft washers 6 and from a washer 3 between which are two caged rolling element wreaths 5 roll.
  • The washer 3 of the axial roller bearing simultaneously forms an outer ring 3 a radial needle bearing, between the and an inner ring 4 in a cage axially parallel guided bearing needles 7 roll.
  • The inner ring 4 of the radial needle bearing and the shaft washers 6 of the axial roller bearing are with the spindle 2 firmly connected. The wave disks 6 but are on the spindle 2 displaceable. Such a combined needle-axial cylindrical roller bearing 1 lies on a paragraph 9 the spindle 2 on and is by means of a bearing nut 8th subjected to a required for low-wear and exact function of the bearing bias. The bearing nut 8th engages in unspecified thread on the spindle 2 one.
  • The outer ring or the intermediate disc 3 Combined needle-axial cylindrical roller bearing 1 is in a housing bore of a two-part housing 12 held. Both parts of the case 12 be through an in 1 not shown screw 11 held together.
  • According to the invention are outer ring 3 or intermediate disc 3 and wave washer 6 matched in their radial and axial dimensions to one another so that between the end faces of the outer ring 3 and the wave disks 6 two defined damping gaps 10 arise. For this it is necessary that compared to a conventional combined needle-axial cylindrical roller bearing of the outer ring 3 slightly widened in the axial direction and the wave washers 6 be enlarged in the circumferential direction.
  • This damping column 10 be over one in the outer ring 3 attached feed channel 14 supplied with damping fluid. It is expediently provided that the lubricating oil provided for lubricating the bearing is used as the damping fluid. The lubricating oil passes through one in the housing 12 or in the outer ring 3 arranged feed channel 14 first in the career area of the bearing needles 7 (before it over the raceway area of the cylindrical Wälzkörperkränze 5 the attenuation column (s) 10 reached. Excess oil can pass through an axial gap between the bearing housing 12 and the wave washer 6 be derived.
  • In contrast to 1 where the rolling elements 5 in an annular groove 15 of the outer ring 3 are housed, the rolling elements 5 in 2 housed in a room separated from the outer ring 3 , from the inner ring 4 , the wave washers 6 and the spacer rings 13 is limited. The spacer rings 13 close with the outer surface of the outer ring 3 from and extend in the direction of the bearing center so far that the rolling elements 5 including her cage freely circulate. The or the damping gaps 10 in this case are from the wave disks 6 and an end face of the spacer rings 13 educated.
  • 1
    roller bearing
    2
    spindle
    3
    Outer ring, washer
    4
    inner ring
    5
    rolling elements
    6
    wave washers
    7
    bearing needles
    8th
    Bearing nut
    9
    paragraph
    10
    damping gap
    11
    screw
    12
    casing
    13
    spacer
    14
    feed channel
    15
    annular groove

Claims (5)

  1. Roller bearing ( 1 ) for mounting a machine tool spindle ( 2 ), consisting of an outer ring ( 3 ) and an inner ring ( 4 ), between which preferably cylindrical rolling elements ( 7 ) and in which between the end faces of the outer ring ( 3 ) on the one hand and at a distance from these and arranged with the spindle ( 2 ) connected wave washers ( 6 ) on the other hand rolling elements ( 5 ), whereby the wave washers ( 6 ) for adjusting its preload on the spindle ( 2 ) are arranged displaceably, characterized in that the radial and axial extent of outer ring ( 3 ) and wave washers ( 6 ) are coordinated so that between the end faces of the outer ring ( 3 ) and the wave washers ( 6 ) an attenuation gap ( 10 ), which via a supply channel ( 14 ) in the outer ring ( 3 ) can be acted upon with damping fluid, wherein on the inside of the outer ring ( 3 ) in its edge region annular grooves ( 15 ) for receiving the rolling elements ( 5 ) are arranged.
  2. Rolling bearings ( 1 ) according to claim 1, characterized in that the damping gap ( 10 ) has a width of 0.02 to 0.03 mm.
  3. Roller bearing ( 1 ) according to claim 1, characterized in that the supply channel ( 14 ) in the middle of the outer ring ( 3 ) is arranged.
  4. Roller bearing ( 1 ) according to claim 1, characterized in that the damping fluid from the for lubricating the rolling elements ( 5 . 7 ) used oil.
  5. Roller bearing ( 1 ) according to claim 1, characterized in that on the end faces of the outer ring ( 3 ) Spacers ( 13 ) are arranged, which with the outer circumferential surface of the outer ring ( 3 ) and extend in the direction of the bearing center to the extent that between the end faces of the outer ring ( 3 ) and the wave washers ( 6 ) arranged rolling elements ( 5 ) can pass freely.
DE19924232563 1992-09-29 1992-09-29 Rolling bearing for mounting a machine tool spindle Expired - Fee Related DE4232563B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924232563 DE4232563B4 (en) 1992-09-29 1992-09-29 Rolling bearing for mounting a machine tool spindle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924232563 DE4232563B4 (en) 1992-09-29 1992-09-29 Rolling bearing for mounting a machine tool spindle
FR9311448A FR2696216B1 (en) 1992-09-29 1993-09-27 Bearing for mounting a machine tool spindle.

Publications (2)

Publication Number Publication Date
DE4232563A1 DE4232563A1 (en) 1994-03-31
DE4232563B4 true DE4232563B4 (en) 2005-09-29

Family

ID=6469090

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19924232563 Expired - Fee Related DE4232563B4 (en) 1992-09-29 1992-09-29 Rolling bearing for mounting a machine tool spindle

Country Status (2)

Country Link
DE (1) DE4232563B4 (en)
FR (1) FR2696216B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10151263B4 (en) * 2001-10-17 2010-12-02 Schaeffler Technologies Gmbh & Co. Kg Axial rolling bearing
WO2005103515A1 (en) * 2004-03-30 2005-11-03 Harmonic Drive Systems Inc. Composite roll bearing
DE102012007972A1 (en) * 2012-04-20 2013-10-24 Gm Global Technology Operations, Llc gear assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1776647A (en) * 1929-12-28 1930-09-23 Camp M Zubler Antifriction bearing
DE7201256U (en) * 1972-01-14 1972-04-06 Skf Kugellagerfab Gmbh
DE2738287A1 (en) * 1977-08-25 1979-03-01 Schaeffler Ohg Industriewerk Combined radial and thrust rolling bearing - has inner race with slots at either side increasing flexibility under thrust loading
DE3811129C2 (en) * 1988-03-31 1991-11-07 Fortuna-Werke Maschinenfabrik Gmbh, 7000 Stuttgart, De
DE4105982C1 (en) * 1991-02-26 1992-08-13 Hueller Hille Gmbh, 7140 Ludwigsburg, De Main spindle bearing system for machine tool - has middle bearing play-free adjustable, its bush non-rotatable, and sealing rings in gap ends

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1464889A (en) * 1965-11-26 1967-01-06 Rolling
DE2630740B2 (en) * 1976-04-08 1978-08-31 Kugelfischer Georg Schaefer & Co, 8720 Schweinfurt
DE2917425A1 (en) * 1979-04-28 1980-11-06 Schaeffler Ohg Industriewerk RADIAL-AXIAL ROLLER BEARING, ESPECIALLY FOR THE BEARING OF BALL ROLLER SPINDLES IN MACHINE TOOLS
GB2080888A (en) * 1980-07-29 1982-02-10 Rolls Royce Bearing assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1776647A (en) * 1929-12-28 1930-09-23 Camp M Zubler Antifriction bearing
DE7201256U (en) * 1972-01-14 1972-04-06 Skf Kugellagerfab Gmbh
DE2738287A1 (en) * 1977-08-25 1979-03-01 Schaeffler Ohg Industriewerk Combined radial and thrust rolling bearing - has inner race with slots at either side increasing flexibility under thrust loading
DE3811129C2 (en) * 1988-03-31 1991-11-07 Fortuna-Werke Maschinenfabrik Gmbh, 7000 Stuttgart, De
DE4105982C1 (en) * 1991-02-26 1992-08-13 Hueller Hille Gmbh, 7140 Ludwigsburg, De Main spindle bearing system for machine tool - has middle bearing play-free adjustable, its bush non-rotatable, and sealing rings in gap ends

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
INA-Sonderdruck aus "Antriebstechnik", Heft 10, Oktober 1990 *
Katalog "Kombinierte Radial-Axiallager der Firma INA, NAN-D 9.71 S, 1971 *
Katalog 4001 der Fa. SKF, 1991, S. 156-159 *
Konstruktion, 28 Jg., 1976, Heft 11, S. 453 *

Also Published As

Publication number Publication date
FR2696216A1 (en) 1994-04-01
FR2696216B1 (en) 1995-10-27
DE4232563A1 (en) 1994-03-31

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8127 New person/name/address of the applicant

Owner name: INA WAELZLAGER SCHAEFFLER OHG, 91074 HERZOGENAURAC

8110 Request for examination paragraph 44
8127 New person/name/address of the applicant

Owner name: INA-SCHAEFFLER KG, 91074 HERZOGENAURACH, DE

8120 Willingness to grant licenses paragraph 23
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: SCHAEFFLER KG, 91074 HERZOGENAURACH, DE

8327 Change in the person/name/address of the patent owner

Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, 91074 H, DE

8339 Ceased/non-payment of the annual fee