CN2274600Y

CN2274600Y - Bicycle two speed rear axle assembly

Info

Publication number: CN2274600Y
Application number: CN 96230563
Authority: CN
Inventors: 唐翰章
Original assignee: SUZHOU SULIAN BICYCLE SPEED VARIATOR CO Ltd
Current assignee: Suzhou Sulian Bicycle Speed Variator Co.,Ltd.
Priority date: 1996-08-27
Filing date: 1996-08-27
Publication date: 1998-02-18
Anticipated expiration: 2006-08-27

Abstract

The utility model relates to a secondary change-speed backshaft of a bicycle. A planetary gear set is installed in the utility model, and the right-and-left slide of a central gear is converted by the impellent force of a gear shifting impellent pin and an impellent pin of the central gear; when the central gear is impelled leftwards, the left end of the central gear enters and is locked with an inner tooth-shaped clutch hole of a toothed ring, resultingly, the left end of the central gear can not rotate and forms a state of even speed; when the central gear is impelled rightwards, the right end of the central gear enters the inner tooth-shaped clutch hole of a right shaft bumper, and the central gear is locked; besides, due to the rotation of a freewheel, the planetary gear set which is matched with the central gear and installed on the utility model forms a state of speed increase. The utility model has the advantages of simple structure, low cost and high reliability.

Description

Two-step speed varying back shaft for bicycle

The utility model relates to the speed-changing mechanism of bicycle, is meant a kind of rear axle of two stage speed change of bicycle especially.

Known bicycle gearshift roughly has two big classes, one class is outer speed-changing mechanism, its speed range wide (can reach 24 grades) generally is applied on the moving vehicle, another kind of is internal speed-changing mechanism, be generally three-step gear shift, level Four is also arranged, the Pyatyi iso-variable velocity, this class speed-changing mechanism generally all adopts sun and planet gear, wherein the sun tooth in the planet tooth system all is designed to and axle core coenosarc, do not allow to rotate, speed change all relies on gearshift to switch input and output and finishes, then in the structure except that planetary gear system, also be provided with the ratchet and pawl that is no less than two groups and promote mechanism such as gearshift, complex structure, part complexity is in addition not only made difficulty and is involved great expense.

The purpose of this utility model is to overcome the shortcoming of prior art, and two-step speed varying back shaft for bicycle a kind of simple in structure, safe and reliable is provided.

Formation of the present utility model comprises rear axletree, sun tooth axle sleeve, sun tooth, planet tooth group, gearshift is promoted, ring gear shell and left and right sides axle bumper, the rear axletree left part has the groove that clamps the thrust trip ring, its middle part has for movable slotted hole about the distribution of sun tooth, the other groove that the thrust bead coil is installed that has of slotted hole, have in its right part the endoporus that gearshift is promoted is installed, sun tooth axle sleeve slides over the position of the external diameter of button beaming roller near slotted hole, be fitted with sun tooth pushing pin in it, sun tooth pushing pin is taken with the gearshift pushing pin and is leaned on, sun tooth pushing pin is promoted to take with gearshift and is leaned on, sun tooth is installed on the external diameter of sun tooth axle sleeve, between thrust trip ring and sun tooth, spring is housed, the two ends of spring are set with spring perch, right axle bumper screw-in rear axletree seals near the thrust bead coil and with not-go-end and contacts, right axle bumper right-hand member has a projection to be flush-mounted in the elongated slot internal fixation of vehicle frame, left end and sun tooth adjacent have and can hold the internal tooth form clutch hole that sun tooth enters, described planet tooth group comprises that several planetary wheels and planetary wheel pin and sun tooth match and is installed in the planet toothholder, at its right part the bottle screw that flywheel is installed is arranged, ring gear shell inner bottom part and sun tooth adjacent have and can hold the internal tooth form clutch hole that sun tooth enters.

Fig. 1 is the outside drawing of the utility model structure;

Fig. 2 is the cutaway view of the utility model structure, and the figure first half is illustrated in the speedup state, and lower part is illustrated in flat fast state.

Fig. 3 is the rear axletree cutaway view;

Fig. 4 is rear axletree and associated components sectional arrangement drawing.

Fig. 5 is three planetary wheel distribution sectional side elevations;

Fig. 6 is four planetary wheel distribution sectional side elevations;

Fig. 7 is a planet toothholder constructional drawing;

Fig. 8 cuts open figure for gear hub office;

Fig. 9 cuts open figure for right axle bumper office;

Figure 10 is in the fundamental diagram of speedup state for planetary gear system.

Further specify embodiment of the present utility model below in conjunction with accompanying drawing.

Left part at rear axletree 1 has a groove 1a, clamp E shape thrust trip ring 2 in it, the middle part of rear axletree 1 has a slotted hole 1b, sun tooth axle sleeve 6 sliding sleeves are in close this slotted hole 1b place of the external diameter of rear axletree, the other groove 1c that also has of slotted hole installs thrust bead coil 13, the right part of rear axletree has endoporus 1d, insert gearshift in it and promote 8, insert sun tooth pushing pin 7 in the aperture of sun tooth axle sleeve 6, sun tooth axle sleeve can only be horizontally slipped and can not rotate, pushing pin 7 is taken with gearshift distribution 8 and is leaned on, sun tooth 5 slides on the external diameter of sun tooth axle sleeve 6, it can freely be rotated, one spring, 4 two ends put bullet seat 3 and are installed between thrust trip ring 2 and the sun tooth 5, it makes near thrust bead coil 13 and seals 14b with not-go-end and contacts to screw in right axle bumper 14 on rear axletree 1, thrust bead coil 13 is pushed down, right axle bumper 14 is fixed, the right-hand member of right axle bumper 14 has a projection 14e to be flush-mounted in the elongated slot of vehicle frame, it can not be rotated, the right-hand member of right axle bumper 14 also has the internal tooth form clutch hole 14a identical with sun tooth 5 numbers of teeth, make sun tooth when promoting to slide to the right, can enter in it, and because its stationary state, sun tooth can not be rotated, 3～4 planetary wheels 10 are installed in the fixing clearance 12b of Planetary gear seat 12 around 9 pivot joints of planetary wheel pin are distributed in sun tooth 5 respectively, form planet tooth group, right part at Planetary gear seat 12 has the bottle screw that freewheel is installed, one ring gear shell 11 also is provided with internal tooth form clutch hole 11a, its number of teeth is also identical with the sun tooth number of teeth, when sun tooth can enter when promoting slides left in it and by locked.

According to said structure, when external force promotion gearshift promotes 8, promoted to take sun tooth pushing pin 7 simultaneously by on it, just driving sun tooth axle sleeve 6 makes sun tooth 5 slide to the left side, at this moment the sun tooth left end head 7 internal tooth form clutch hole 11a that enters ring gear shell 11 makes whole planetary gear system by locked, and drive 12 rotations of planet toothholder from the rotation of flywheel, simultaneously since with planet tooth 10 ingear ring gear shells 11 and sun tooth 5 be an integral body, so the rotation of flywheel equals direct turning gear toroidal shell 11, ring gear shell 11 is axle housing at this moment, form through-coupling, promptly flat fast state, otherwise discharge extraneous 8 thrust that gearshift is promoted, sun tooth is subjected to the elastic force of its left side spring 4 to slide to the right, make the left end head of sun tooth 5 leave the internal tooth form clutch hole 11a of ring gear shell 11, and make its right-hand member head enter the internal tooth form clutch hole 14a of right axle bumper 14, because so right axle bumper can not rotate sun tooth 5 and can not rotate, this moment, the rotational force of flywheel promoted planetary wheel pin 9 to A direction rotation (as Figure 10), planet tooth 10 rotates to the B direction, and drive the rotating speed speedup rotation that ring gear shell 11 is pressed A to the C direction, form the speedup state.

The utility model has the advantages that and utilize flywheel commonly used, except conventional planet tooth Outside the system, seldom peculiar part adopts input point and Exit Point constant, and is only mobile Flat speed and speedup secondary transmission speed change are finished, knot in two positions about sun tooth Structure is simple, and is with low cost.

Claims

1. two-step speed varying back shaft for bicycle, mainly comprise rear axletree, sun tooth axle sleeve, sun tooth, planet tooth group, gearshift is promoted, ring gear shell and left and right sides axle bumper, it is characterized in that the rear axletree left part has the groove that clamps the thrust trip ring, its middle part has for movable slotted hole about the distribution of sun tooth, the other groove that the thrust bead coil is installed that has of slotted hole, have in its right part the endoporus that gearshift is promoted is installed, sun tooth axle sleeve slides over the position of the external diameter of button beaming roller near slotted hole, be fitted with sun pushing pin in it, sun tooth pushing pin is taken with the gearshift pushing pin and is leaned on, sun tooth pushing pin is promoted to take with gearshift and is leaned on, sun tooth is installed on the external diameter of sun tooth axle sleeve, between thrust trip ring and sun tooth, spring is housed, the two ends of spring are set with spring perch, right axle bumper screw-in rear axletree seals near the thrust bead coil and with not-go-end and contacts, right axle bumper right-hand member has a projection to be flush-mounted in the elongated slot internal fixation of vehicle frame, left end and sun tooth adjacent have and can hold the internal tooth form clutch hole that sun tooth enters, described planet tooth group comprises that several planetary wheels and planetary wheel pin and sun tooth match and is installed in the planet toothholder, at its right part the bottle screw that flywheel is installed is arranged, ring gear shell inner bottom part and sun tooth adjacent have and can hold the internal tooth form clutch hole that sun tooth enters.

2. two-step speed varying back shaft for bicycle according to claim 1 is characterized in that in the described planet tooth group 3～4 planetary wheels being arranged.

3. two-step speed varying back shaft for bicycle according to claim 1, the number of teeth that it is characterized in that described internal tooth form clutch hole is being advisable by the locked sun tooth that it is held.