CN2182777Y

CN2182777Y - Speed-changeable bicycle with two step transmission with back wheel axle used as crank

Info

Publication number: CN2182777Y
Application number: CN 93239464
Authority: CN
Inventors: 彭国强
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-29
Filing date: 1993-10-29
Publication date: 1994-11-16
Anticipated expiration: 2003-10-29

Abstract

The utility model relates to a novel speed changing bicycle with two-stage transmission. The utility model is characterized in that the utility model is composed of a saddle arranged on the vertical upstanding fork of a rear wheel, a centre shaft system arranged on the inclined fork of the rear wheel and a rear shaft system, wherein, the rear shaft system is composed of the crank shaft of a pedal, a chain wheel, the shaft sleeve of the rear wheel, an installing shaft sleeve, a bearing, a rear speed changing device, etc. The centre shaft system is composed of a centre shaft, a shaft sleeve, a multi-stage flywheel, a bearing, a front speed changing device and the chain wheel group of the centre shaft. The two-stage transmission of the rear shaft system and the centre shaft system is accomplished by two chains. Because the crank shaft system of a pedal between two wheels in the prior art is left out, so the utility model has the advantages of short bicycle body, light weight, flexible operation, portability and convenient storage. The utility model is used for traveling, body-building, entertainment, etc.

Description

Speed-changeable bicycle with two step transmission with back wheel axle used as crank

The utility model relates to a kind of secondary transmission gear shift bicycle of hind axle double as pedal crank shaft.

On existing variable speed bicycle, on the vehicle frame between front-wheel and the trailing wheel, the rider drives this pedal crank shaft and drives the back flying wheel by the chain on the chain wheel and rotates the pedal crank shaft of band chain wheel mostly.Therefore to guarantee the cruising of bicycle, have to keep the position of the crank radius of rotation an of necessity between the two-wheeled, this makes the vehicle frame size of bicycle big, car load length length, Heavy Weight, flexibility of operation is not good enough and inconveniently shortcoming such as carry, deposit.

The purpose of this utility model is that a kind of hind axle secondary transmission gear shift bicycle of double as pedal crank shaft simultaneously will be provided, and it can overcome above-mentioned deficiency of the prior art effectively under the preceding topic that guarantees its moving velocity.

The purpose of this utility model can realize by following structure: the pedal crank shaft of band chain wheel is contained in the trailing wheel axle sleeve of band flywheel, and parts such as axle sleeve, Rear Derailleur are installed are formed the back axle system with rolling bearing, vehicle frame on the axle; Tiltedly stick the axis system that forms by axis, bearing, axle sleeve, multistage flywheel, Front Derailleur and axis chain wheel that adorns at the vehicle frame trailing wheel; Saddle is installed in vertical upright the sticking of trailing wheel.When advancing, with the crank shaft on the axle system of pedal driving back, the chain wheel on the crank shaft is by the multistage flywheel on the chain drive axis, and the axis chain wheel that rotates with multistage flywheel rotates by flying wheel after another chain drive again.

Because the utility model will have the function of the pedal crank shaft of variable speed bicycle now and transfer on the back axle system, and formed a new type of drive with axis system that the vehicle frame trailing wheel is tiltedly stuck, so it can be in the shortening that guarantees to realize under the situation of the speed of a motor vehicle front and back wheel wheelspan, thus play dwindle the vehicle frame size, alleviate bicycle weight, flexible operation, the effect that is easy to carry and deposits.

Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof.

Fig. 1 is a constructional drawing of the present utility model;

Fig. 2 is the section-drawing of back axle system;

Fig. 3 is the section-drawing of axis system.

Below in conjunction with accompanying drawing the utility model is described in further detail.

The utility model is made up of front and back wheel (1) (8), front axle (14), front fork (2), handlebar (3), vehicle frame (4), saddle (6), chain (11) (13), back axle system (10) and axis system (5) etc., and wherein: saddle (6) is fixed on the vertical upright fork (7) of trailing wheel; One fixed type bearing (19) and three bearings (16) (22) (24) that can carry out position adjustments by screw thread are arranged on the axle (17) of back axle system (10), vehicle frame is installed axle sleeve (18), trailing wheel axle sleeve (20) and vehicle frame are installed axle sleeve (23) and have then been supported rear axle (17) by cooperatively interacting between the bearing (16) (19) (22) (24) respectively, on vehicle frame installation axle sleeve (18) (23), respectively have one annular groove (31) (28) is installed, thrust step (30) (29) and clamping nut (15) (26) are being installed respectively when screwing on the axle sleeve (18) (23) and can holddown belt U-lag mouth be installed by the upright fork of vehicle frame trailing wheel (7) of termination when clamping nut (15) (26); Axis system (5) is welded on the vehicle frame trailing wheel and tiltedly pitches on (12), supporting axis (36) by axle sleeve (35) by two bearings (34) (37), axis (36) one ends are fixed a chain wheel (33), the other end is fixed a multistage flywheel (38), and Front Derailleur (32) is fixed on the axis axle sleeve (35) by two fix screws (39) that circumferentially distribute.When driving pedal crank (9), the chain wheel (25) on the rear axle (17) will rotate by the multistage flywheel (38) that chain (13) drives in the axis system (5).The axis chain wheel (33) that rotates with multistage flywheel (38) drives back flying wheel (21) by chain (11) again and rotates, and forms the secondary transmission thus and orders about bicycle and advance.Bicycle can carry out speed of a motor vehicle adjusting by Front Derailleur (32) and the Rear Derailleur (27) that is installed on the upright fork of vehicle frame trailing wheel (7).

The utility model is because hind axle double as pedal crank shaft, and form new secondary type of drive by the axis system that double-stranded bar and vehicle frame trailing wheel are tiltedly stuck, so compared with prior art, just the working space that has saved the pedal crank between the front and back wheel, thereby the wheel spacing that makes front and back wheel can become very little, this has just dwindled the vehicle frame size greatly, shortened car load length and has alleviated car body weight, and obtains the effect of flexible operation, storage and carrying.

Claims

1, a kind ofly tiltedly pitch the secondary transmission gear shift bicycle of the hind axle double as pedal crank shaft that (12), chain (11) (13), saddle (6), pedal crank (9), crank chain wheel (25), multistage flywheel (38), front and back change-speed box (32) (27) and back flying wheel (21) form, it is characterized in that by the upright fork of front and back wheel (1) (8), front axle (14), front fork (2), handlebar (3), vehicle frame (4), vehicle frame trailing wheel (7), vehicle frame trailing wheel:

Saddle is installed on the vertical upright fork (7) of trailing wheel;

The pedal crank shaft (17) of band chain wheel (25) is contained in the trailing wheel axle sleeve (20) of band flywheel (21), and with rolling bearing (16) (19) (22) (24), vehicle frame on the axle (17) composition back axle systems (10) such as axle sleeve (18) (23) and Rear Derailleur (27) is installed;

Tiltedly pitch at the vehicle frame trailing wheel and to adorn an axis system (5) that forms by axis (36), bearing (34) (37), axle sleeve (35), multistage flywheel (38), Front Derailleur (32) and axis chain wheel (33) on (12).

2, variable speed bicycle according to claim 1, it is characterized in that having on the axle (17) of described back axle system (10) fixed type bearing (19) and three can be by the bearings (16) (22) (24) of screw thread adjusting position, vehicle frame installation axle sleeve (18), trailing wheel axle sleeve (20) and vehicle frame installation axle sleeve (23) be respectively by having supported pedal crank shaft (17) with cooperatively interacting between the head bearing (16) (19) (22) (24).

3,, it is characterized in that respectively having on the described vehicle frame installation axle sleeve (18) (23) one annular groove (31) (28), thrust step (30) (29) and clamping nut (15) (26) are installed according to claim 1,2 described variable speed bicycles.

4, variable speed bicycle according to claim 1 is characterized in that the Rear Derailleur (27) on the described back axle system (10) is installed on the upright fork of vehicle frame trailing wheel (7).

5, variable speed bicycle according to claim 1, it is characterized in that described axis system (5) is welded on the vehicle frame trailing wheel and tiltedly pitches on (12), supporting axis (36) by axle sleeve (35) by two bearings (34) (37), axis (36) one ends are axis chain wheel (33), the fixing multistage flywheel (38) of the other end fixedly, and Front Derailleur (32) is fixed on the axis axle sleeve (35) by two fix screws (39) that circumferentially distribute.

6, according to claim 1,2,5 described variable speed bicycles, it is characterized in that the secondary type of drive rotated by the multistage flywheel (38) that chain (13) drives in the axis system (5) by the chain wheel (25) on the pedal crank shaft (17), the axis chain wheel (33) that rotates with multistage flywheel (38) drives back flying wheel (21) by chain (11) again and rotates.