CN206914559U - A electric car for integrating body-building and riding instead of walk - Google Patents

A electric car for integrating body-building and riding instead of walk Download PDF

Info

Publication number
CN206914559U
CN206914559U CN201720709271.3U CN201720709271U CN206914559U CN 206914559 U CN206914559 U CN 206914559U CN 201720709271 U CN201720709271 U CN 201720709271U CN 206914559 U CN206914559 U CN 206914559U
Authority
CN
China
Prior art keywords
motor
building
battery
treadbelt
rotary shaft
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
CN201720709271.3U
Other languages
Chinese (zh)
Inventor
周永谦
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of CN206914559U publication Critical patent/CN206914559U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A electric car for integrating body-building and riding instead of walk, including vehicle frame, front wheels and rear wheels, trailing wheel is provided with wheel hub motor and battery, and battery is connected with wheel hub motor and controller respectively, also include the power set being arranged on frame pedal position, power set include body-building mechanism and transmission mechanism;Body-building mechanism is connected with transmission mechanism, and body-building mechanism includes front rotary shaft, rear rotating shaft and treadbelt, and treadbelt tensioner is set on front rotary shaft and rear rotating shaft, and treadbelt is driven by transmission mechanism, and motor is connected with battery and controller respectively.During body-building walking-replacing, the trailing wheel that power drive electric bicycle caused by treadbelt is trampled by driver's manpower travels, battery provides electric power to motor, and driver controls motor to drive treadbelt to provide power-assisted, tramples driver's manpower easy and convenient during treadbelt by controller;Rested or when riding instead of walk when trampling treadbelt traveling and having tired out needs, motor is closed by controller, the wheel hub motor on trailing wheel is opened, In-wheel motor driving trailing wheel driving electric bicycle running, completes to ride instead of walk.

Description

A electric car for integrating body-building and riding instead of walk
Technical field
The utility model belongs to technical field of transportation means, and in particular to a to integrate body-building electronic with riding instead of walk Car.
Background technology
Electric bicycle, has become a kind of relatively broad vehicles in China, and it has flexibly and easily, energy-conserving and environment-protective Advantage, the energy of electric bicycle mostlys come from battery.The characteristics of electric bicycle is due to its energy-conserving and environment-protective, extensively by The favor of people is arrived, the people to be lived in city are on and off duty and trip mostly uses electric bicycle as walking-replacing tool.
At this stage, with the raising of quality of life, the run duration of people is fewer and fewer, especially for living in city The people of city, motion usually are only limitted to motion on the way on and off duty, and the outdoor exercises time is in the trend of continuous reduction.
Utility model content
The defects of existing for prior art, the purpose of this utility model are to trample treadbelt by manpower walking or running to produce Raw power drive electric bicycle traveling, provide power-assisted to treadbelt by motor or electric bicycle traveling driven by motor, A electric car for integrating body-building and riding instead of walk.
In order to solve the above technical problems, technical scheme is as follows used by the utility model:
A electric car for integrating body-building and riding instead of walk, including vehicle frame, front wheels and rear wheels, trailing wheel are provided with wheel hub motor And battery, battery are connected with wheel hub motor and controller respectively, in addition to the power dress on frame pedal position Put, power set include body-building mechanism and transmission mechanism;Body-building mechanism is connected with transmission mechanism, body-building mechanism include front rotary shaft, Rotating shaft and treadbelt afterwards, treadbelt tensioner are set on front rotary shaft and rear rotating shaft, and treadbelt is driven by transmission mechanism, motor respectively with Battery connects with controller.
Transmission mechanism includes power transmission shaft and motor, and motor is connected with battery and controller respectively, power transmission shaft Left side be provided with the second sprocket wheel or belt pulley, the right side of power transmission shaft is provided with second gear, and the main shaft of motor is provided with the 3rd Sprocket wheel or belt pulley, the left side of rear rotating shaft are provided with the first sprocket wheel or belt pulley, and the right side of rear rotating shaft is provided with first gear, the first tooth Wheel and second gear engaged transmission, pass through chain drive, or the first belt pulley and the 3rd between the first sprocket wheel and the 3rd sprocket wheel Pass through belt transmission between belt pulley.
Front rotary shaft and rear shaft parallel are arranged between pedal, and power transmission shaft is fixed on rear side of first gear by fixed plate On vehicle frame, motor is fixed on the first sprocket wheel or the vehicle frame at belt pulley rear by motor mount, is set on the main shaft of trailing wheel There are the 4th sprocket wheel or belt pulley, the main shaft between the 4th sprocket wheel or belt pulley and trailing wheel is provided with freewheel clutch, the second sprocket wheel By passing through belt transmission between chain drive, or the second belt pulley and the 4th belt pulley between the 4th sprocket wheel.
Also include bascule, bascule includes the front leg strut and rear support leg that frame panel front and back ends are respectively articulated with, preceding Articulated linkage between supporting leg and rear support leg, one end of hinged electric push rod on the bottom plate between electric car front leg strut and rear support leg, The other end of electric pushrod is hinged on connecting rod, and electric pushrod is connected with battery and controller respectively.
Front leg strut is made up of rotary shaft after one and two fore-stocks, two fore-stocks respectively it is outward-dipping be fixed on after revolve The left and right sides lower surface of rotating shaft, the preceding bracing piece parallel with rear rotary shaft, a left side for rear rotary shaft are provided between two fore-stocks Right both ends are respectively hinged at the underside of forward of fixed mount, and rear support leg is made up of rotary shaft after one and two after-poppets, after two The support outward-dipping left and right sides lower surface for being fixed on rear rotary shaft respectively, it is provided between two after-poppets and is put down with rear rotary shaft Capable rear bracing piece, the left and right ends of rear rotary shaft are respectively hinged on the downside of the rear portion of fixed mount, preceding bracing piece and rear bracing piece Between be provided with a connecting rod, the front end of connecting rod is hinged with preceding bracing piece, and the rear end of connecting rod is hinged with rear bracing piece.
Also include vehicle seat retractor device, vehicle seat retractor device includes fixed mount and the slip being slidably connected on fixed mount Frame, fixed mount are that guideway is connected with travelling carriage, and power-driven mechanism is provided with travelling carriage, can drive travelling carriage is front and rear to move Dynamic, power-driven mechanism is connected with battery and controller respectively.
The power-driven mechanism is electric pushrod, and one end of electric pushrod is hinged on travelling carriage, electric pushrod it is another One end is hinged on fixed mount.
The left side upper surface of fixed mount is provided with left chute, and the right side upper surface of fixed mount is provided with the right cunning parallel with left chute Groove, the left side lower surface of travelling carriage are provided with left slide rail, and the right side lower surface of travelling carriage is provided with the right slide rail parallel with left slide rail, Left slide rail is slidably arranged in left chute, and right slide rail is slidably arranged in right rail, and the actuating unit drives for motor, fixed The upper surface of frame is provided with motor mount, and motor is arranged on motor mount, and motor is rotating reducing motor, and motor exports Driving gear is provided with axle, the middle lower surface of travelling carriage is provided with the rack parallel with left slide rail, driving tooth wheel and rack phase Engagement.
Travel switch is equipped with the front-end and back-end of fixed mount, travel switch is connected with controller.
Battery is installed, the battery is lithium battery on vehicle frame.
Using above-mentioned technical proposal, the utility model has the advantages that:
During body-building walking-replacing, the trailing wheel row of power drive electric bicycle caused by treadbelt is trampled by driver's manpower Sail, battery provides electric power to motor, and driver controls motor to drive treadbelt to provide power-assisted, makes to drive by controller The person's of sailing manpower is trampled easy and convenient during treadbelt;Rest or when riding instead of walk when trampling treadbelt traveling and having tired out needs, closed by controller Motor, the wheel hub motor on trailing wheel is opened, In-wheel motor driving trailing wheel driving electric bicycle running, completes to ride instead of walk;When When driver needs to take a load off one's feet, the power-driven mechanism on vehicle seat retractor device is controlled to act by controller, power drive Can be electric pushrod or motor gear rack drives, driving vehicle seat moves forward, when vehicle seat, which moves forward, encounters travel switch Stop movement, driver can sit on vehicle seat and rest;After driving electric bicycle drives to destination, balancing control moves Make, battery provides electric power to the electric pushrod of bascule, and electric pushrod drives front leg strut and rear support leg downward by connecting rod It is moved rearwards, electric bicycle is entirely propped, parks steady.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of the utility model power set;
Fig. 3 is the structural representation of the utility model bascule;
Fig. 4 is Fig. 3 left view;
Fig. 5 is the structural representation of the utility model vehicle seat retractor device;
Fig. 6 is Fig. 5 right view.
Embodiment
Specific embodiment of the present utility model is described in further detail below in conjunction with the accompanying drawings:
As shown in figures 1 to 6, a electric car for integrating body-building and riding instead of walk, including vehicle frame 1, front-wheel 3 and trailing wheel 4, after Wheel 4 is provided with wheel hub motor 5.Also include the power set being arranged on the position of frame pedal 2, power set are provided by battery Power, power set include body-building mechanism and transmission mechanism;Body-building mechanism is connected with transmission mechanism, and body-building mechanism includes front rotary shaft 6th, rear rotating shaft 7 and treadbelt 8, the tensioner of treadbelt 8 are set on front rotary shaft 6 and rear rotating shaft 7, and treadbelt 8 is driven by transmission mechanism.Treadbelt 8 The as pedal of electric bicycle.
Transmission mechanism includes power transmission shaft 9 and motor 10, and the left side of power transmission shaft 9 is provided with the second sprocket wheel 11, power transmission shaft 9 Right side is provided with second gear 12, and the main shaft of motor 10 is provided with the 3rd sprocket wheel 13, and the left side of rear rotating shaft 7 is provided with the first sprocket wheel 14, the right side of rear rotating shaft 7 is provided with first gear 15, first gear 15 and the engaged transmission of second gear 12, the first sprocket wheel 14 and the Pass through chain drive between three sprocket wheels 13.Here the first sprocket wheel, the first sprocket wheel and the 3rd sprocket wheel is replaced with belt pulley, then and Pass through belt transmission between one belt pulley and the 3rd belt pulley.
Front rotary shaft 6 and rear rotating shaft 7 are set in parallel between frame pedal 2, and power transmission shaft 9 is fixed on first by fixed plate 16 On the vehicle frame 1 of the rear side of gear 15, motor 10 is fixed by motor mount 17 on the vehicle frame 1 at the rear of the first sprocket wheel 14, after The main shaft of wheel 4 is provided with the 4th sprocket wheel 18, and the main shaft between the 4th sprocket wheel 18 and trailing wheel 4 is provided with freewheel clutch 19, and second Pass through chain drive between the sprocket wheel 18 of sprocket wheel 11 and the 4th.Here the first sprocket wheel, the second sprocket wheel and the 4th sprocket wheel is by by skin Belt wheel is replaced, then passes through belt transmission between the second belt pulley and the 4th belt pulley.
Also include bascule, bascule includes the front leg strut 20 and rear support leg that frame panel front and back ends are respectively articulated with 21, articulated linkage 22 between front leg strut 20 and rear support leg 21, it is hinged on the bottom plate between electric car front leg strut 20 and rear support leg 21 One end of electric pushrod 23, the other end of electric pushrod 23 are hinged on connecting rod 22.Front leg strut 20 and the contour structures of rear support leg 21 All same.
Front leg strut 20 is made up of a preceding rotary shaft 24 and two fore-stocks 25, and two fore-stocks 25 are distinguished outward-dipping solid The left and right sides lower surface of preceding rotary shaft 24 is scheduled on, the preceding bracing piece parallel with preceding rotary shaft 24 is provided between two fore-stocks 25 26, the left and right ends of preceding rotary shaft 24 are respectively hinged at the underside of forward of fixed mount, and rear support leg 21 is by the He of rotary shaft 27 after one Two after-poppets 28 form, two after-poppets 28 outward-dipping left and right sides lower surface for being fixed on rear rotary shaft 27 respectively, and two The rear bracing piece 29 parallel with rear rotary shaft 27 is provided between individual after-poppet 28, the left and right ends of rear rotary shaft 27 are respectively hinged at On the downside of the rear portion of fixed mount, a connecting rod 22 is provided between preceding bracing piece 26 and rear bracing piece 29, the front end of connecting rod 22 adds with preceding Strong bar 26 is be hinged, and the rear end of connecting rod 22 is be hinged with rear bracing piece 29.
Also include vehicle seat retractor device, vehicle seat retractor device includes fixed mount 30 and the cunning being slidably connected on fixed mount 30 Moving frame 31, fixed mount 30 are that guideway is connected with travelling carriage 31, are provided with power-driven mechanism on travelling carriage 31, can drive cunning Moving frame 31 is movable.Vehicle seat 32 is arranged on travelling carriage 31.
The power drive is electric pushrod, and one end of electric pushrod is hinged on travelling carriage 31, electric pushrod it is another End is hinged on fixed mount 30.Driven by power electric pushrod is provided by lithium battery to stretch, before driving the vehicle seat 32 on travelling carriage 31 After move.
The left side upper surface of fixed mount 30 is provided with left chute 35, and the right side upper surface of fixed mount 30 is provided with flat with left chute 35 Capable right rail 36, the left side lower surface of travelling carriage 31 are provided with left slide rail 37, and the right side lower surface of travelling carriage 31 is provided with and left cunning The parallel right slide rail 38 of rail 37, left slide rail 37 are slidably arranged in left chute 35, and right slide rail 38 is slidably arranged in right rail 36.
The actuating unit is that motor 33 drives, and the upper surface of fixed mount 30 is provided with motor mount 17, and motor 33 is installed On motor mount 17, motor 33 is rotating reducing motor 33, and driving gear 34 is provided with the output shaft of motor 33, is slided The middle lower surface of frame 31 is provided with the rack 39 parallel with left slide rail 37, and driving gear 34 is meshed with rack 39.By lithium battery Driven by power rotating reducing motor 33 is provided to act, the gear band carry-over bar 39 on rotating reducing motor 33 slides back and forth, Rack 39 drives the vehicle seat 32 on travelling carriage 31 movable
Travel switch 40 is equipped with the front-end and back-end of fixed mount 30.Prevent travelling carriage 31 from deviating from from fixed mount 30.
Lithium battery 41 is installed on vehicle frame 1.Lithium battery 41 is the general supply of all consuming parts, and lithium battery 41 has structure The advantages of weight is small, and Power Reserve is big.
The course of work of the present utility model is as follows:
During body-building walking-replacing, the row of trailing wheel 4 of power drive electric bicycle caused by treadbelt 8 is trampled by driver's manpower Sail, lithium battery 41 provides electric power to motor 10, controls motor 10 to drive treadbelt 8 to provide power-assisted by controller, makes Driver's manpower trample it is easy and convenient during treadbelt 8, motor 10 run when pass through controller control wheel hub motor 5 stop fortune OK;Rested or when riding instead of walk when trampling the traveling of treadbelt 8 and having tired out needs, motor 10 is closed by controller, opened on trailing wheel 4 Wheel hub motor 5, wheel hub motor 5 drive the driving electric bicycle running of trailing wheel 4, complete to ride instead of walk;When driver needs to take a load off one's feet When, control the power-driven mechanism on the retractor device of vehicle seat 32 to act by controller, power drive can be electric pushrod or electricity Machine rack-and-pinion 39 drives, and driving vehicle seat 32 moves forward, and stops movement when vehicle seat 32, which moves forward, encounters travel switch 40, Driver can sit on vehicle seat 32 and rest;After driving electric bicycle drives to destination, balancing control action, lithium electricity Pond 41 provides electric power to the electric pushrod 23 of bascule, and electric pushrod 23 drives front leg strut 20 and rear support leg 21 by connecting rod 22 Move rearward, electric bicycle is entirely propped, park steady.
The present embodiment not makees any formal limitation, every foundation to shape of the present utility model, material, structure etc. Any simple modification, equivalent change and modification that the technical essence of the utility model is made to above example, belongs to this reality With the protection domain of new technique scheme.

Claims (10)

1. a electric car for integrating body-building and riding instead of walk, including vehicle frame, front wheels and rear wheels, trailing wheel be provided with wheel hub motor and Battery, battery are connected with wheel hub motor and controller respectively, it is characterised in that:Also include being arranged on frame pedal position Power set, power set include body-building mechanism and transmission mechanism;Body-building mechanism is connected with transmission mechanism, and body-building mechanism includes Front rotary shaft, rear rotating shaft and treadbelt, treadbelt tensioner are set on front rotary shaft and rear rotating shaft, and treadbelt is driven by transmission mechanism, driver Structure includes power transmission shaft and motor, and motor is connected with battery and controller respectively.
2. a electric car for integrating body-building and riding instead of walk according to claim 1, it is characterised in that:A left side for power transmission shaft Side is provided with the second sprocket wheel or belt pulley, and the right side of power transmission shaft is provided with second gear, and the main shaft of motor is provided with the 3rd sprocket wheel Or belt pulley, the left side of rear rotating shaft are provided with the first sprocket wheel or belt pulley, the right side of rear rotating shaft is provided with first gear, first gear with Second gear engaged transmission, pass through chain drive, or the first belt pulley and the 3rd belt between the first sprocket wheel and the 3rd sprocket wheel Pass through belt transmission between wheel.
3. a electric car for integrating body-building and riding instead of walk according to claim 2, it is characterised in that:Front rotary shaft is with after Shaft parallel is arranged between pedal, and power transmission shaft is fixed on the vehicle frame on rear side of first gear by fixed plate, and motor leads to Cross motor mount to fix on the first sprocket wheel or the vehicle frame at belt pulley rear, the main shaft of trailing wheel is provided with the 4th sprocket wheel or belt Wheel, the main shaft between the 4th sprocket wheel or belt pulley and trailing wheel are provided with freewheel clutch, lead between the second sprocket wheel and the 4th sprocket wheel Cross between chain drive, or the second belt pulley and the 4th belt pulley and pass through belt transmission.
4. a electric car for integrating body-building and riding instead of walk according to any one of claim 1-3, it is characterised in that: Also include bascule, bascule includes the front leg strut and rear support leg that frame panel front and back ends are respectively articulated with, and front leg strut is with after Articulated linkage between supporting leg, one end of hinged electric push rod, electric pushrod on the bottom plate between electric car front leg strut and rear support leg The other end be hinged on connecting rod, electric pushrod is connected with battery and controller respectively.
5. a electric car for integrating body-building and riding instead of walk according to claim 4, it is characterised in that:Front leg strut is by one Rotary shaft and two fore-stocks composition after root, two fore-stocks outward-dipping left and right sides following table for being fixed on rear rotary shaft respectively Face, is provided with the preceding bracing piece parallel with rear rotary shaft between two fore-stocks, and the left and right ends of rear rotary shaft are respectively hinged at solid Determine the underside of forward of frame, rear support leg is made up of rotary shaft after one and two after-poppets, and two after-poppet difference are outward-dipping solid The left and right sides lower surface of rear rotary shaft is scheduled on, the rear bracing piece parallel with rear rotary shaft is provided between two after-poppets, rear rotation The left and right ends of rotating shaft are respectively hinged on the downside of the rear portion of fixed mount, and a connecting rod is provided between preceding bracing piece and rear bracing piece, The front end of connecting rod is hinged with preceding bracing piece, and the rear end of connecting rod is hinged with rear bracing piece.
6. a electric car for integrating body-building and riding instead of walk according to claim 5, it is characterised in that:Also include vehicle seat Retractor device, vehicle seat retractor device include fixed mount and the travelling carriage being slidably connected on fixed mount, and fixed mount is with travelling carriage Guideway connects, and is provided with power-driven mechanism on travelling carriage, travelling carriage can be driven to move forward and backward, power-driven mechanism difference It is connected with battery and controller.
7. a electric car for integrating body-building and riding instead of walk according to claim 6, it is characterised in that:The power drives Motivation structure is electric pushrod, and one end of electric pushrod is hinged on travelling carriage, and the other end of electric pushrod is hinged on fixed mount.
8. a electric car for integrating body-building and riding instead of walk according to claim 6, it is characterised in that:A left side for fixed mount Side upper surface is provided with left chute, and the right side upper surface of fixed mount is provided with the right rail parallel with left chute, under the left side of travelling carriage Surface is provided with left slide rail, and the right side lower surface of travelling carriage is provided with the right slide rail parallel with left slide rail, and left slide rail is slidably arranged in a left side In chute, right slide rail is slidably arranged in right rail, and the power-driven mechanism is driven for motor, and the upper surface of fixed mount is provided with Motor mount, motor are arranged on motor mount, and motor is rotating reducing motor, are provided with motor output shaft actively Tooth.
9. a electric car for integrating body-building and riding instead of walk according to claim 7, it is characterised in that:In fixed mount Front-end and back-end are equipped with travel switch, and travel switch is connected with controller.
10. a electric car for integrating body-building and riding instead of walk according to claim 8, it is characterised in that:Pacify on vehicle frame Equipped with battery, the battery is lithium battery.
CN201720709271.3U 2017-05-02 2017-06-19 A electric car for integrating body-building and riding instead of walk Expired - Fee Related CN206914559U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201720476162 2017-05-02
CN2017204761621 2017-05-02

Publications (1)

Publication Number Publication Date
CN206914559U true CN206914559U (en) 2018-01-23

Family

ID=61321667

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201720709271.3U Expired - Fee Related CN206914559U (en) 2017-05-02 2017-06-19 A electric car for integrating body-building and riding instead of walk

Country Status (1)

Country Link
CN (1) CN206914559U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110001856A (en) * 2019-04-22 2019-07-12 湖南理工学院 A kind of exercycle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110001856A (en) * 2019-04-22 2019-07-12 湖南理工学院 A kind of exercycle
CN110001856B (en) * 2019-04-22 2020-11-03 湖南理工学院 Body-building cycle

Similar Documents

Publication Publication Date Title
CN107117251A (en) Integrate body-building and the electric car ridden instead of walk
CN206914559U (en) A electric car for integrating body-building and riding instead of walk
CN202180883U (en) Self-propelled four-wheeled box wagon
CN2461518Y (en) Wheel chair able to crawl stairs
CN210027726U (en) Power-assisted tricycle
CN106985952A (en) One kind is ridden instead of walk body-building Multipurpose electric bicycle
CN101314389A (en) Skate-board
CN204979112U (en) Novel dual -purpose electric bicycle
CN200995743Y (en) Entertainment exercising bicycle
CN206813222U (en) One kind is ridden instead of walk body-building Multipurpose electric bicycle
CN103625584A (en) Car imitation type electric power tricycle
CN206278214U (en) Sit dynamic exercycle
CN204296963U (en) A kind of hand rocking electric boosted tricycle
CN206511002U (en) A kind of single moving trolley
CN206704423U (en) One kind is ridden instead of walk body-building Multipurpose electric bicycle
CN205131479U (en) Formula of moving away to avoid possible earthquakes speed -changing bicycle
CN2705377Y (en) Cabinet type three-wheel bicycle
CN208602636U (en) A kind of transmission system can be used for national standard electric bicycle
CN201231848Y (en) Skate-board
CN202593775U (en) Effort-saving device of manpower-driven system for bicycles and electric vehicles
CN205365936U (en) Portable environmental protection gravity exercise bicycle
CN201082344Y (en) Land racing boat training machine
CN101962059A (en) Three-wheel single swinging scooter
CN201244139Y (en) Electric and hand-push dual-purpose wheelchair
CN201447007U (en) Unequal wheel diameter double guide rail spring bicycle

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20180123

Termination date: 20190619

CF01 Termination of patent right due to non-payment of annual fee