DE4007942C1 - Securing component on rotating shaft - involves retaining ring to avoid expansion of circlip at high shaft speed - Google Patents

Securing component on rotating shaft - involves retaining ring to avoid expansion of circlip at high shaft speed

Info

Publication number
DE4007942C1
DE4007942C1 DE19904007942 DE4007942A DE4007942C1 DE 4007942 C1 DE4007942 C1 DE 4007942C1 DE 19904007942 DE19904007942 DE 19904007942 DE 4007942 A DE4007942 A DE 4007942A DE 4007942 C1 DE4007942 C1 DE 4007942C1
Authority
DE
Germany
Prior art keywords
shaft
circlip
retaining ring
ring
slip
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
DE19904007942
Other languages
German (de)
Inventor
Wolf Dr.-Ing. 7056 Weinstadt De Boll
Axel Dipl.-Ing. 7032 Sindelfingen De Fedeler
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.)
Daimler Benz AG
Original Assignee
Mercedes Benz AG
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 Mercedes Benz AG filed Critical Mercedes Benz AG
Priority to DE19904007942 priority Critical patent/DE4007942C1/en
Application granted granted Critical
Publication of DE4007942C1 publication Critical patent/DE4007942C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
    • F16B21/16—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
    • F16B21/16—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft
    • F16B21/18—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft with circlips or like resilient retaining devices, i.e. resilient in the plane of the ring or the like; Details
    • F16B21/186—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft with circlips or like resilient retaining devices, i.e. resilient in the plane of the ring or the like; Details external, i.e. with contracting action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
    • F16B21/20—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts for bolts or shafts without holes, grooves, or notches for locking members

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)

Abstract

A component (4) which is located on a rotating shaft (3), is axially secured by a circlip (1) which is retained in an external shaft groove (2). In order to prevent circlip expansion due to centrifugal forces, a closed retaining ring (5) is placed over the circlip. The retaining ring (5) is provided with an axial collar whose profile matches the circlip profile. An internal radial flange (6) has its inside edge wedged on the shaft in order to secure its installation. USE/ADVANTAGE - Circlip location on rotary shaft is secured against expansion by simple shaft-mounted retaining ring.

Description

Die Erfindung betrifft die Sicherung eines radial geschlitzten Wellen-Sicherungsringes gegen fliehkraftbedingtes Aufweiten.The invention relates to securing a radially slotted Shaft circlip against centrifugal expansion.

Eine solche Sicherung ist zur Vermeidung eines Aufweitens des Wellen-Sicherungsringes bei hohen Drehzahlen aus DE-U-75 35 901 bekannt. Dort ist über einen radial geschlitzten Wellen- Sicherungsring ein geschlossener Ring außen formschlüssig aufgestülpt. Da dieser aufgestülpte Ring eine innen durchgehende zylindrische hinterschnittfreie Umfangsfläche in gleicher Weise wie der gegen Aufweiten zu sichernde Wellen-Sicherungsring aufweist, ist eine axiale Fixierung des aufgestülpten Ringes notwendig. Dies geschieht dadurch, daß dieser Aufstülp-Ring an seiner einen Seite an der Nabe anliegt, in der die Welle gelagert ist, und auf der anderen Seite durch einen außen spannenden in der Nabenbohrung fixierten Sprengring gesichert ist. Es sind hier also insgesamt zwei Ringe erforderlich, und zwar einmal der geschlossene Aufstülp-Ring und zum anderen noch zusätzlich ein außenspannender Sprengring, der außerhalb der Welle gelagert werden muß.Such a backup is to avoid expanding the Shaft circlip at high speeds from DE-U-75 35 901 known. There is a radially slotted wave Circlip a closed ring put on positively on the outside. Because this put on ring is continuous on the inside cylindrical undercut-free peripheral surface in the same way like the shaft circlip to be secured against expansion has an axial fixation of the slipped ring necessary. This happens because this slip-on ring one side abuts the hub in which the shaft is mounted is, and on the other hand by an outside exciting snap ring fixed in the hub bore is secured. It a total of two rings are required here on the one hand the closed slip-on ring and on the other hand additionally an external snap ring that is outside the Shaft must be stored.

Hier eine Vereinfachung zu schaffen, ist die Aufgabe der vorliegenden Erfindung. Außerdem soll die Sicherung nicht außerhalb der Welle angebracht werden müssen. The task of the present is to create a simplification here Invention. In addition, the fuse should not be outside the shaft must be attached.  

Gelöst wird diese Aufgabe durch eine Ausführung des aufzustülpenden Sicherungsringes nach den kennzeichnenden Merkmalen des Patentanspruches 1.This task is solved by executing the one to be put on Circlip according to the characteristic features of the Claim 1.

Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Appropriate embodiments of the invention are the subject of Subclaims.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt. Es zeigtAn embodiment is shown in the drawing. It shows

Fig. 1 eine Wellensicherung im Längsschnitt Fig. 1 is a shaft lock in longitudinal section

Fig. 2 einen Schnitt nach Linie II-II in Fig. 1 durch die Wellensicherung Fig. 2 shows a section along line II-II in Fig. 1 by the shaft lock

Fig. 3 eine Draufsicht auf die Wellensicherung in Richtung der Wellenachse Fig. 3 is a plan view of the shaft lock in the direction of the shaft axis

Fig. 4 eine alternative Ausführung des Überstülp-Ringes in der Darstellung der Wellensicherung nach Fig. 1 Fig. 4 shows an alternative embodiment of the Überstülp-ring in the view of the shaft lock of Fig. 1

Fig. 5, 6 alternative Fixierungen des Überstülp-Ringes in der Darstellung der Wellensicherung nach Fig. 1 Fig. 5, 6 alternative fixings of Überstülp-ring in the view of the shaft lock of Fig. 1

Fig. 7-9 alternative Ausführungsformen von Sicherungsringen mit entsprechend angepaßten Überstülp-Ringen in der Darstellungsweise der Wellensicherung nach Fig. 2 Fig. 7-9, alternative embodiments of locking rings with correspondingly adapted Überstülp-rings in the drawing, the shaft lock of Fig. 2

Ein innenspannender radial geschlitzter Wellen-Sicherungsring 1 sitzt in einer Ringnut 2 einer Welle 3, wobei er sich axial an einem Ende an einer die Welle lagernden Nabe 4 und an dem anderen Ende innerhalb der Ringnut 2 abstützt. An internally clamping, radially slotted shaft retaining ring 1 is seated in an annular groove 2 of a shaft 3 , being axially supported at one end on a hub 4 supporting the shaft and at the other end within the annular groove 2 .

Gegen ein fliehkraftbedingtes Aufweiten, das bei hohen Drehzahlen eintreten kann, ist der Wellen-Sicherungsring 1 durch einen Überstülp-Ring 5 gesichert. Dieser Ring ist ein Winkelring, der mit seinem axial ausgerichteten Schenkel formschlüssig den Wellen-Sicherungsring 1 umgreift und der mit seinem radialen Schenkel federnd auf dem Außenumfang der Welle 3 aufliegt. Zur Erzielung der radialen Federwirkung ist der radiale Schenkel des Überstülp-Ringes 5 innen etwa kronenartig gezackt. Die Zacken dieser kronenartigen Formgebung sind über den Innenumfang verteilte in Umfangsrichtung freistehende federnde Laschen 6, wie sie in Fig. 3 dargestellt sind.The shaft retaining ring 1 is secured by a slip ring 5 against expansion caused by centrifugal force, which can occur at high speeds. This ring is an angular ring, which with its axially aligned leg positively engages around the shaft retaining ring 1 and which rests with its radial leg resiliently on the outer circumference of the shaft 3 . To achieve the radial spring action, the radial leg of the slip ring 5 is roughly serrated inside. The serrations of this crown-like shape are resilient tabs 6 which are distributed in the circumferential direction and are distributed over the inner circumference, as shown in FIG. 3.

Die Form der Laschen 6 kann unterschiedlich ausgeführt sein, wozu Beispiele in Fig. 1, 4, 5 und 6 gegeben sind. Die Ausführungen der Laschen 6 nach den Fig. 1 und 4 sind für einen federnden selbsthemmenden kraftschlüssigen Sitz des Überstülp- Ringes 5 auf der Welle 3 bestimmt.The shape of the tabs 6 can be designed differently, examples of which are given in FIGS. 1, 4, 5 and 6. The designs of the tabs 6 according to FIGS. 1 and 4 are intended for a resilient, self-locking, non-positive fit of the slip ring 5 on the shaft 3 .

Die Ausführungen der Laschen 6 nach den Fig. 5 und 6 sind dagegen für einen axial formschlüssigen Sitz auf der Welle 3 ausgebildet, wobei die Enden der Laschen 6 an Hinterschnitten 7 der Welle 3 anliegen.The embodiments of the tabs 6 shown in FIGS. 5 and 6, however, are formed for an axially form-fitting seating on the shaft 3, which abut the ends of the straps 6 to undercuts 7 of the shaft 3.

Die Wellen-Sicherungsringe 1 nach den Fig. 7 und 9 weisen eine auf ihrem Außenumfang unregelmäßige Form auf. In diesem Fall ist wegen des in Umfangsrichtung angestrebten Formschlusses eine entsprechende Form des jeweiligen Überstülp-Ringes 5 zu wählen.The shaft locking rings 1 according to FIGS . 7 and 9 have an irregular shape on their outer circumference. In this case, a corresponding shape of the respective slip ring 5 must be selected because of the positive engagement desired in the circumferential direction.

Die Ausführung des Überstülp-Ringes mit am inneren Umfang aus der Ringebene nach außen gewölbten Laschen 6 entsprechend den Fig. 4 und 6 ermöglicht insbesondere eine Wiederverwendung eines bereits einmal demontierten Überstülp-Ringes 5.The design of the slip ring with tabs 6 that bulge outwards from the ring plane on the inner circumference in accordance with FIGS. 4 and 6 in particular enables reuse of a slip ring 5 that has already been removed.

Bezugszeichenliste:Reference symbol list:

1 Wellen-Sicherungsring
2 Ringut
3 Welle
4 Nabe
5 Überstülp-Ring
6 Laschen
7 Hinterschnitt 1 shaft locking ring
2 Ringut
3 wave
4 hub
5 slip ring
6 tabs
7 undercut

Claims (3)

1. Sicherung eines radial geschlitzten Wellen-Sicherungsringes gegen fliehkraftbedingtes Aufweiten durch einen den Sicherungsring radial formschlüssig umfassenden axial fixierten radial geschlossenen Überstülp-Ring, dadurch gekennzeichnet, daß der Überstülp-Ring (5) ein Winkelring ist, dessen radial ausgerichteter Schenkel (Radialschenkel) radial federnd auf der Welle (3) des Wellen-Sicherungsringes (1) zumindest kraftschlüssig aufsitzt.1. Securing a radially slotted shaft locking ring against centrifugal expansion by an axially fixed, radially positive, radially closed slip-on ring, characterized in that the slip-on ring ( 5 ) is an angle ring, the radially aligned leg (radial leg) of which is radial resiliently at least non-positively on the shaft ( 3 ) of the shaft retaining ring ( 1 ). 2. Sicherung eines radial geschlitzten Wellen-Sicherungsringes nach Anspruch 1, dadurch gekennzeichnet, daß sich die Innenkante des Überstülp-Ringes (5) in auf den Wellen-Sicherungsring (1) aufgestülpter Lage in der Oberfläche der Welle (3) verkeilt.2. Securing a radially slotted shaft retaining ring according to claim 1, characterized in that the inner edge of the slip ring ( 5 ) wedged onto the shaft retaining ring ( 1 ) in the position of the shaft ( 3 ). 3. Sicherung eines radial geschlitzten Wellen-Sicherungsringes nach Anspruch 1, dadurch gekennzeichnet, daß der Radialschenkel des Überstülp-Ringes (5) an seiner Innenkante formschlüssig an einem axialen Hinterschnitt (7) der Welle (3) anliegt, durch den er an einem axialen Abgleiten von dem Wellen-Sicherungsring (1) gehindert ist.3. Securing a radially slotted shaft retaining ring according to claim 1, characterized in that the radial leg of the slip ring ( 5 ) on its inner edge is positively applied to an axial undercut ( 7 ) of the shaft ( 3 ) through which it is connected to an axial Sliding from the shaft retaining ring ( 1 ) is prevented.
DE19904007942 1990-03-13 1990-03-13 Securing component on rotating shaft - involves retaining ring to avoid expansion of circlip at high shaft speed Expired - Fee Related DE4007942C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19904007942 DE4007942C1 (en) 1990-03-13 1990-03-13 Securing component on rotating shaft - involves retaining ring to avoid expansion of circlip at high shaft speed

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904007942 DE4007942C1 (en) 1990-03-13 1990-03-13 Securing component on rotating shaft - involves retaining ring to avoid expansion of circlip at high shaft speed

Publications (1)

Publication Number Publication Date
DE4007942C1 true DE4007942C1 (en) 1990-09-13

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692642A3 (en) * 1994-07-12 1996-09-25 Deere & Co Washer and assembly of a retention ring with a washer on a shaft
DE102007026415A1 (en) * 2007-06-06 2008-12-11 Zf Friedrichshafen Ag Circlip with at least one conical flank, to fit into a ring groove with a conical flank, is held in place by a radial lock on its upper side
EP1693588A3 (en) * 2005-02-18 2009-05-06 Zf Friedrichshafen Ag Arrangement for axially supporting two rotating elements.
CN103857931A (en) * 2011-08-01 2014-06-11 舍弗勒技术有限两合公司 Securing element, steering bearing with a securing element and steering column with a steering bearing and a securing element
DE102013220393A1 (en) * 2013-10-10 2015-04-16 Zf Friedrichshafen Ag Securing means for securing an axial stop element on a shaft
CN104595320A (en) * 2015-01-30 2015-05-06 上海电气凯士比核电泵阀有限公司 Axial positioning assembly with inner fit clearance and axial positioning method thereof
US20150226276A1 (en) * 2014-02-12 2015-08-13 Ford Global Technologies, Llc Vehicle Transmission and Method of Assembling Vehicle Transmission
JP2016505783A (en) * 2012-12-13 2016-02-25 マック トラックス インコーポレイテッド Retaining ring retaining system and method
DE102016223810A1 (en) 2016-11-30 2018-05-30 Schaeffler Technologies AG & Co. KG Device for securing a machine element on a shaft
DE102017128358A1 (en) 2016-11-30 2018-05-30 Schaeffler Technologies AG & Co. KG Electromotive drive device with a rotor shaft, a machine element and with a device for securing the machine element on the rotor shaft
CN108930624A (en) * 2017-05-24 2018-12-04 三菱电机株式会社 starter
WO2019214763A1 (en) * 2018-05-07 2019-11-14 Schaeffler Technologies AG & Co. KG Arrangement for securing at least one circlip against centrifugal force, which circlip is axially fastened on a rotor shaft of an electrical machine for positional securing, and use of an arrangement of this type
DE102011079754B4 (en) 2011-07-25 2020-06-18 Schaeffler Technologies AG & Co. KG Drive wheel for an internal combustion engine with a permanently connected starter motor
CN112088263A (en) * 2018-05-07 2020-12-15 舍弗勒技术股份两合公司 Assembly for fixing the axial position of the sun gear of a planetary gear train stage on the rotor shaft of an electric machine and use of such an assembly
EP3900116A4 (en) * 2018-12-21 2022-08-24 Burndy, LLC Electrical connector bolt retainer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7535901U (en) * 1975-11-12 1976-04-29 Seeger-Orbis Gmbh, 6240 Koenigstein Connection device for a machine part with a shaft

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7535901U (en) * 1975-11-12 1976-04-29 Seeger-Orbis Gmbh, 6240 Koenigstein Connection device for a machine part with a shaft

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692642A3 (en) * 1994-07-12 1996-09-25 Deere & Co Washer and assembly of a retention ring with a washer on a shaft
EP1693588A3 (en) * 2005-02-18 2009-05-06 Zf Friedrichshafen Ag Arrangement for axially supporting two rotating elements.
DE102007026415A1 (en) * 2007-06-06 2008-12-11 Zf Friedrichshafen Ag Circlip with at least one conical flank, to fit into a ring groove with a conical flank, is held in place by a radial lock on its upper side
DE102011079754B4 (en) 2011-07-25 2020-06-18 Schaeffler Technologies AG & Co. KG Drive wheel for an internal combustion engine with a permanently connected starter motor
CN103857931A (en) * 2011-08-01 2014-06-11 舍弗勒技术有限两合公司 Securing element, steering bearing with a securing element and steering column with a steering bearing and a securing element
CN103857931B (en) * 2011-08-01 2015-11-25 舍弗勒技术股份两合公司 Fixing element, steering bearing with fixing element and steering column with steering bearing and fixing element
JP2016505783A (en) * 2012-12-13 2016-02-25 マック トラックス インコーポレイテッド Retaining ring retaining system and method
DE102013220393A1 (en) * 2013-10-10 2015-04-16 Zf Friedrichshafen Ag Securing means for securing an axial stop element on a shaft
US10533616B2 (en) 2014-02-12 2020-01-14 Ford Global Technologies, Llc. Vehicle transmission and method of assembling vehicle transmission
US20150226276A1 (en) * 2014-02-12 2015-08-13 Ford Global Technologies, Llc Vehicle Transmission and Method of Assembling Vehicle Transmission
US9845832B2 (en) * 2014-02-12 2017-12-19 Ford Global Technologies, Llc Vehicle transmission and method of assembling vehicle transmission
CN104595320A (en) * 2015-01-30 2015-05-06 上海电气凯士比核电泵阀有限公司 Axial positioning assembly with inner fit clearance and axial positioning method thereof
DE102017128358A1 (en) 2016-11-30 2018-05-30 Schaeffler Technologies AG & Co. KG Electromotive drive device with a rotor shaft, a machine element and with a device for securing the machine element on the rotor shaft
DE102016223810A1 (en) 2016-11-30 2018-05-30 Schaeffler Technologies AG & Co. KG Device for securing a machine element on a shaft
CN108930624A (en) * 2017-05-24 2018-12-04 三菱电机株式会社 starter
WO2019214763A1 (en) * 2018-05-07 2019-11-14 Schaeffler Technologies AG & Co. KG Arrangement for securing at least one circlip against centrifugal force, which circlip is axially fastened on a rotor shaft of an electrical machine for positional securing, and use of an arrangement of this type
CN112088263A (en) * 2018-05-07 2020-12-15 舍弗勒技术股份两合公司 Assembly for fixing the axial position of the sun gear of a planetary gear train stage on the rotor shaft of an electric machine and use of such an assembly
CN112088480A (en) * 2018-05-07 2020-12-15 舍弗勒技术股份两合公司 Device for fixing at least one circlip against centrifugal force, which is axially fastened to a rotor shaft of an electric machine for fixing the position, and use of a device of this type
CN112088263B (en) * 2018-05-07 2023-09-29 舍弗勒技术股份两合公司 Assembly for the axial position of a sun gear and use of such an assembly
US11939998B2 (en) 2018-05-07 2024-03-26 Schaeffler Technologies AG & Co. KG Arrangement for securing at least one circlip against centrifugal force, which circlip is axially fastened on a rotor shaft of an electrical machine for positional securing, and use of an arrangement of this type
EP3900116A4 (en) * 2018-12-21 2022-08-24 Burndy, LLC Electrical connector bolt retainer
US11996665B2 (en) 2018-12-21 2024-05-28 Burndy, LLC Electrical connector bolt retainer

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Owner name: DAIMLER-BENZ AKTIENGESELLSCHAFT, 70567 STUTTGART,

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Owner name: DAIMLERCHRYSLER AG, 70567 STUTTGART, DE

8339 Ceased/non-payment of the annual fee