CN2224153Y

CN2224153Y - Coaxial speed-variator

Info

Publication number: CN2224153Y
Application number: CN 95204947
Authority: CN
Inventors: 李亚军
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-11
Filing date: 1995-03-11
Publication date: 1996-04-10
Anticipated expiration: 2005-03-11

Abstract

The utility model relates to a speed-variator, particularly a coaxial speed-variator for bicycles and wheelchairs of the disabled. The utility model comprising a main shaft, a variable-speed shaft sheathed on the main shaft; a speed variation shaft is provided with the outer shell of the speed-variator; the outer shell is connected with a driving gear and a driven gear by connection rods and is engaged in an inner gear ring by a bearing; the outer shell of the speed-variator is provided with an on-off positioning pin which passing through the outer shell is inserted on the inner gear ring, and the positioning pin can freely clutch. The utility model has simple structure, convenient speed variation, low cost and beautiful appearance.

Description

Coaxial speed variator

The utility model relates to a kind of transmission system, and the coaxial speed variator especially for rickshaws such as bicycle, three-wheel vehicle and disabled persons belongs to bicycle drive technology field.

At present, various types of change-speed boxs of bicycle use, the overwhelming majority still belongs to tower sprocket wheel speed-changing mechanism, and will stir chain and carry out speed governing, owing to when stirring chain, make the chain generation oblique line that hangs on flywheel and the sprocket wheel with dialling the chain device, so very big resistance is arranged between the parts, its wearing and tearing are also very big, and driving efficient reduces, and part life is short.Its structure more complicated in addition, the tooling cost height.

The purpose of this utility model provides a kind of coaxial speed variator, shortcoming such as avoid that present bicycle tower speed changer friction drag is big, parts rapid wear, driving efficient are low.

The purpose of this utility model is such: engagement epicyclic transmission mechanism in driving wheel, follower, internally toothed annulus are designed to, driving wheel is that satellite gear rotates around follower, and mesh with internally toothed annulus, passive driving wheel is concentric with internally toothed annulus, bull stick one end is fixed on the main shaft, the other end connects drive sprocket axle, main brass is in variable shaft, bottom bracket axle, fix with ratchet and pedal, follower is connected as a single entity by variable shaft and sprocket wheel and drives the chain rotation, the steady arm frame is fixed on the bicycle cant beam, frame be provided with can manual clutch locator card.When locator card closes gearbox case is pinned when not changeing, pedal drives main shaft and rotates, the driving wheel of bull stick one end is made whole garden Zhou Yundong between internally toothed annulus and follower, the passive rotation of driving wheel self, thereby driving follower and variable shaft rotates, obtained the speed change degree on sprocket wheel, bicycle shift travels; Therefore when locator card was opened, driving wheel, follower, bull stick rotated together, and change-speed box integral body is rotated with main shaft, did not produce the speed change degree on sprocket wheel, ratchet under the effect of main shaft, drives the chain crop rotation in the same way, with the speed motion, maintenance bicycle normal speed is travelled.

Owing to adopted the utility model, the tower speed-changing mechanism in front and back of common derailleur and numerous and diverse manual chain jumping wheel word are omitted, chain can move in same plane, chain is stressed rationally to reduce wear, and has reduced resistance, laborsaving during use, the theory of engagement in the planetary wheel has simplified structure, has dwindled volume, easy to assembly, it is extensive to have applicability, and speed change is flexible, rotates characteristics such as can obtaining friction speed in the same way.

Further narrate the utility model below in conjunction with drawings and Examples:

Fig. 1 is the utility model first embodiment schematic diagram;

Fig. 2 is the utility model second embodiment schematic diagram;

Fig. 3 is the utility model the 3rd embodiment schematic diagram;

Fig. 4 is the utility model wheelchair principle assumption diagram.

Driving wheel 1 is that engagement is rotated around follower 2 in the satellite gear internally toothed annulus 3 in Fig. 1, gearbox case 9 and internally toothed annulus 3 are enclosed within the two ends of variable shaft 5 for one and sprocket wheel 7 symmetries, the rotating shaft of bull stick 4 one termination driving wheels 1, the other end is fixed on the main shaft 6, with its rotation, follower 2 is fixed as one by driven axle 5 and sprocket wheel 7, main shaft 6 outer variable shaft 5 and the axis 10 of being with, ratchet 8 is captiveed joint with main shaft 6, with its rotation.

Fig. 2 has provided another kind of constructional drawing of the present utility model.Gearbox case 9 comprises driving wheel 1, follower 2, and internally toothed annulus 3 is provided with boss and replaces variable shaft 5 to connect sprocket wheel 7 with the same end of sprocket wheel 7 devices at axis 10, follower 2 left end face, and gearbox case 9 is sleeved on the boss.The axle of (with reference to Fig. 3) driving wheel 1 can extend and directly be fixed on the crank 11 in implementation process.

The utility model can also be installed on the manual wheelchair according to shown in Figure 4, gearbox case 9 comprises that driving wheel 1, follower 2 and internally toothed annulus 3 are installed in wheel 14 inboards of wheelchair, wheel 14 is fixing by variable shaft 5 and follower 2, manually circle 12 is fixed on the wheel rim of wheel 14, speed change circle 13 replaces ratchet to be fixedly connected on the main shaft 6, when travelling, speed change rotates speed change astragal main shaft and driving wheel rotation, follower rotates thereupon, thereby wheel produces the speed change degree, during cruising, need only rotation manual circle direct drive wheel turns, wheelchair marches forward.

Claims

1, a kind of coaxial speed variator, form by driving wheel, follower, main shaft, variable shaft and gearbox case etc., it is characterized in that: driving wheel (1) meshes with internally toothed annulus (3), follower (2) respectively for satellite gear, internally toothed annulus (3) is sleeved on the variable shaft (5) for one with gearbox case (9), the rotating shaft of bull stick (4) one termination driving wheels (1), the other end and main shaft (6) are fixing, follower (2) connects driven axle (5) and is fixed as one with sprocket wheel (7), main shaft (6) is outer to be with variable shaft (5) and axis (10), and ratchet (8) is captiveed joint with main shaft (6).

2, coaxial speed variator according to claim 1 is characterized in that: gearbox case (9) and sprocket wheel (7) device are at the same end of axis (10), and follower (2) left end face is provided with boss, and gearbox case (9) is sleeved on the boss.

3, according to claim 1 and 2 described coaxial speed variators, it is characterized in that: the axle of driving wheel (1) can extend and directly be fixed on the crank (11).

4, coaxial speed variator according to claim 1, it is characterized in that: gearbox case (9) comprises that driving wheel (1), follower (2) and internally toothed annulus (3) are installed in wheel (14) inboard of wheelchair, wheel (14) is fixing by variable shaft (5) and follower (2), manually circle (12) is fixed on wheel (11) and the wheel rim, and speed change circle (13) is fixedly connected on the main shaft (6).