CN2131787Y

CN2131787Y - Power saving variable-speed wheel gear for bicycle

Info

Publication number: CN2131787Y
Application number: CN 92230255
Authority: CN
Inventors: 张雪辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-10
Filing date: 1992-08-10
Publication date: 1993-05-05
Anticipated expiration: 2002-08-10

Abstract

The utility model discloses a power-saving variable-speed wheel disc for a bicycle. A driving wheel disc is fixedly arranged at the right crank of an existing bicycle; a semicircular chainwheel is arranged at the driving wheel disc; both sides of the driving wheel disc are provided with slide ways, and the driving wheel disc is matched with the semicircular chainwheel in a sliding way through the slide ways; the semicircular chainwheel is provided with convex blocks; the variable-speed wheel disc is arranged on the driving wheel disc, and the variable-speed wheel disc is provided with two spiral grooves; the convex blocks are matched with the spiral grooves of the variable-speed wheel disc in a sliding way; the axial center of the variable-speed wheel disc and the axial center of the driving wheel disc are coincident. The utility model has the advantages of labour saving, convenient operation, low cost, high transmission efficiency, etc.

Description

Power saving variable-speed wheel gear for bicycle

The utility model relates to a kind of bicycle labor saving speed change wheel disc, belongs to the bicycle chain driving device.

Existing derailleur, mainly be divided into built-in speed regulator and external mounted change gear, built-in speed regulator is owing to use and inconvenient maintenance, seldom use, the structure of external mounted change gear is: the sprocket piece that the different chain numbers of teeth are installed on bicycle wheel disc and flywheel, constitute cone pulley,, obtain different transmitting ratios by the conversion of chain on the different sprocket pieces of front and back cone pulley.Such design must be used narrow open type chain, and the thickness of sprocket piece also must reduce.And require bicycle rear must become the disk-form biasing.Cycle frame, rim intensity directly are affected, and the thickness of sprocket wheel sprocket reduces, must use the quality matetrial manufacturing, the cost height, service life is short.Also has multistage flywheel variable-speed gear in addition, this device is in the process of riding, wheel disc and flywheel are not in one plane often, the sprocket wheel chain wear is big, easily come off, for guaranteeing that chain is steady in the speed change, multistage flywheel variable-speed gear must use structure comparatively complicated front and back variable-speed controller and trailing wheel tightening device.Use cumbersome.Besides, the circular wheel disc of existing bicycle is in use because the action direction of treadmill power is oblique forward, in a week of treadmill, if legpower is constant, the active line of legpower passes through the bicycle middle shaft axle center twice, parallel with the sprocket crank axis, arm of force length is zero, and moment also is zero.Twice and vertical with sprocket crank, arm of force length equals sprocket crank length not by the axis axle center, so moment is maxim, when the direction of treadmill power was parallel with the sprocket crank axis, no matter legpower was much, all do not have effective merit, this wheel disc uses the gas of requiring great effort very much.

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art part a kind of laborsaving, light, simple in structure bicycle labor saving speed change wheel disc is provided.

The purpose of this utility model is achieved in that the utility model comprises Crank on chain wheel, handlebar, one driving disk is installed on right crank, the semicircle sprocket wheel is installed on the driving disk, the semicircle sprocket wheel is two, two limits of driving disk are respectively as slideway, driving disk is by slideway and semicircle sprocket wheel bearing fit, and the semicircle sprocket wheel can be along slideway linear slide on driving disk.In order to realize speed change, be fixed with projection on the semicircle sprocket wheel.Speed change dish of the present utility model is installed on the driving disk, and its axle center and driving disk axis coinciding have two plug helixs on the speed change dish, and projection slides along helical in plug helix.

Description of drawings:

Fig. 1 is the utility model structural representation.

Fig. 2 is the utility model driving disk front view.

Fig. 3 is the utility model driving disk birds-eye view.

Fig. 4 is the utility model semicircle sprocket wheel bump position structural front view.

Fig. 5 is the utility model semicircle sprocket wheel, bump position structure side view.

Fig. 6 is the utility model speed change dish front view.

Embodiment describes the utility model in detail below in conjunction with accompanying drawing.

Among the figure, (1) is Crank on chain wheel, and (2) are driving disk, and (3) are the semicircle sprocket wheel, and (4) are projection, and (5) are the speed change dish, and (6) are plug helix, and (7) are fin, and (8) are the pin lock, and (9) are slideway.Driving disk of the present utility model (2) is fixedly mounted on the Crank on chain wheel (1), and driving disk (2) slideway line of centers is parallel with the axis of right crank.Semicircle sprocket wheel of the present utility model (3) is two, semicircle sprocket wheel (3) is an axis of symmetry with the axial line of driving disk (2), symmetry is installed on the driving disk (2), the get on the bus tooth of standard pitch of two semicircle sprocket wheels (3), for making speed change smooth, semicircle sprocket wheel (3) meshes and withdraws from last the tooth that some is suitably removed at the position at first, and the utility model is removed the 2-6 tooth.Speed change dish of the present utility model (5) is installed on the driving disk (2), relatively rotates with driving disk.Have two plug helixs on the speed change dish (5), the projection (4) on the semicircle sprocket wheel (3) slides along plug helix, and in order to limit gear, the not changing of the relative positions in riding on the spiral fluted gear positions of speed change dish (5), designs a fin.In order to control relatively rotating of speed change dish (5) and driving disk (2), two semicircle sprocket wheels (3) are formed become the conversion that diminishes greatly, and then realize the conversion of transmitting ratio, the utility model is sold lock (8) in the outside of speed change dish (5) installation one.The utility model matches with bicycle handle bar, in order to cooperate freely, a variable speed control bar is installed in bicycle handle bar, and control stalk is connected with the speed change steel rope, and the speed change steel rope is connected with pin lock (8).Pin pocket floor seat is fixed on the cycle frame.

Principle of work of the present utility model is: not during speed change, bicycle handle bar's variable speed control bar in situ, driving disk is under the effect of treadmill power, drive semicircle sprocket wheel (3) and speed change dish (5) rotation by slideway (9), give trailing wheel with transmission of power, during speed change, pull control stalk, make the pin lock prevent the rotation of speed change dish (5), treadmill forward or backward, driving disk (2) is rotated with respect to speed change dish (5), make two semicircle sprocket wheels (3), inside or outwards slip along the plug helix (6) of speed change dish (5) with driving disk (2) hand of rotation, along crank axis direction or open or fold, the sprocket wheel size is changed, form the Long Circle wheel disc that varies in size, realize the purpose of speed changing force-saving by the size that changes wheel disc.

Compared to existing technology, the utlity model has following advantage:

1, force-saving speed-varying, easy to use;

2, reasonable in design, with low cost;

3, the driving efficiency height is easy to maintenance.

Claims

1, a kind of bicycle labor saving speed change wheel disc, comprise Crank on chain wheel, handlebar, it is characterized in that driving disk (2) is fixedly mounted on the right crank (1), semicircle sprocket wheel (3) is installed on the driving disk (2), two limits of driving disk (2) are slideway (9), driving disk (2) is by slideway (9) and semicircle sprocket wheel bearing fit, projection (4) is arranged on the semicircle sprocket wheel (3), speed change dish (5) places on the driving disk (2), speed change dish (5) is provided with two plug helixs, plug helix bearing fit on projection (4) and the speed change dish (5), the axis coinciding of the axle center of speed change dish (5) and driving disk (2).

2, bicycle labor saving speed change wheel disc according to claim 1 is characterized in that the slideway line of centers of driving disk (2) parallels with the axis of right crank (1).

3, bicycle labor saving speed change wheel disc according to claim 1, it is characterized in that semicircle sprocket wheel (3) is two, axial line with driving disk (2) is that axis of symmetry is arranged on the driving disk (2), the initial engagement of two semicircle sprocket wheels (3) and withdraw from the tooth of all removing some on the position at last.

4, bicycle labor saving speed change wheel disc according to claim 1 is characterized in that the plug helix gear positions on the speed change dish (5) is provided with a fin (7).